Updated on 2024/10/02

写真a

 
KODAMATANI Hitoshi
 
Organization
Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Department of Science Chemistry Program Associate Professor
Title
Associate Professor

Degree

  • 博士(学術) ( 2006.3   神戸大学 )

Research Interests

  • 水銀,ニトロソアミン,HPLC,化学発光

Research Areas

  • Environmental Science/Agriculture Science / Environmental impact assessment  / 分析化学、環境科学、土木環境、生物地球化学

  • Nanotechnology/Materials / Analytical chemistry

Research History

  • Kagoshima University   Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Department of Science Chemistry Program   Associate Professor

    2020.4

  • Kagoshima University   Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Earth and Environmental Sciences Course   Associate Professor

    2019.4 - 2020.3

  • Kagoshima University

    2008.2

  • Kagoshima University   Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Earth and Environmental Sciences Course   Assistant Professor

    2008.2 - 2019.3

Professional Memberships

  • クロマトグラフィー科学会

    2015.10

  • American Chemical Society

    2015

  • 日本水環境学会

    2013.3

  • 日本化学会

    2011.10

  • 日本分析化学会

    2003.4

 

Papers

  • Kanzaki R., Hidaka T., Tokuda Y., Kodamatani H., Tomiyasu T. .  Brønsted acidity of bis(trifluoromethanesulfonyl)amide and trifluoromethanesulfonic acid in ionic liquids of ternary ammonium .  Journal of Molecular Liquids409   2024.9

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    Language:Japanese   Publisher:Journal of Molecular Liquids  

    Bis(trifluoromethanesulfonyl)amide (Tf2N−) and triflate (TfO−) are commonly used anions of protic ionic liquids (PILs). They are the conjugate anions of strong acids, Tf2NH and TfOH, whose Brønsted acidities crucially influence the performance of the PILs. In this study, the Brønsted acidity of Tf2NH and TfOH was compared directly through potentiometric titrations carried out in the ionic liquids of ternary ammonium salts. As a result, Tf2NH exhibits stronger Brønsted acidity than TfOH by approximately 2 pH units. Furthermore, calorimetric titrations revealed that this difference originates from differences in their entropy states. This suggests that the solvation state, rather than the properties in their isolated state, has a more significant impact on the acidities of Tf2NH and TfOH. Besides, ionization thermodynamics turned out to be governed by both the constituent cations and anions of the PILs. Therefore, once the acid-base natures of the constituent ions are characterized, the overall acid-base behavior of the PIL may become predictable.

    DOI: 10.1016/j.molliq.2024.125433

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  • Gao H., Sato S., Kodamatani H., Fujioka T., Ishida K.P., Ikehata K. .  Optimization of Dissolved Silica Removal from Reverse Osmosis Concentrate by Gedaniella flavovirens for Enhanced Water Recovery .  Sustainability (Switzerland)16 ( 10 )   2024.5

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    Language:Japanese   Publisher:Sustainability (Switzerland)  

    Photobiological treatment of reverse osmosis concentrate (ROC) using brackish diatoms is a green and sustainable technology that can enhance water recovery by removing dissolved silica from ROC while producing beneficial biomass. This study aimed to determine the optimum conditions for the photobiological treatment of ROC obtained from a full-scale advanced water purification facility using Gedaniella flavovirens Psetr3. While light color presented minor impacts on the silica uptake rate, the impact of color intensity was significant. The uptake rate improved from 28 ± 1 to 48 ± 7 mg/L/day by increasing photosynthetically active radiation (PAR) from 50 to 310 µmol m−2 s−1. Increasing the PAR further did not improve the performance. The optimum temperature was around 23–30 °C. While the silica uptake was slower at 10 °C, G. flavovirens Psetr3 was unable to survive at 40 °C. Experiments using sunlight as a light source verified the impact of temperature on the silica uptake and the detrimental effect of ultraviolet radiation on this diatom. The sunlight-based treatment effectively removed N-nitrosodimethylamine. The results of this study are being used in subsequent pilot-scale investigations and full-scale technoeconomic analysis and will contribute to the further development of this sustainable water technology.

    DOI: 10.3390/su16104052

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  • Kodamatani H., Sugihara K., Mezyk S.P., Ishida K.P., Roback S.L., Plumlee M.H. .  Methyl nitrate as a byproduct in advanced water treatment systems: Liquid chromatographic determination method and cause of formation .  Chemosphere344   140308   2023.12Reviewed International coauthorship

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Chemosphere  

    Neutral low-molecular-weight organics such as methyl nitrate that can readily pass through reverse osmosis (RO) membranes employed in potable water reuse facilities attract interest owing to public health considerations. In this study, a novel determination method based on high-performance liquid chromatography, online photochemical conversion to peroxynitrite, and luminol chemiluminescence detection was developed for methyl nitrate measurement in treated water. The maximum photochemical conversion efficiency of methyl nitrate to peroxynitrite was found to be 6.5% using a 222-nm excimer lamp. The calibration curve for the developed method was linear between 1.0 × 10−9 and 1.0 × 10−7 M, and the limit of detection was 0.3 nM (0.03 μg/L) given an injection volume of 200 μL. The methyl nitrate concentrations in RO permeate from reclaimed wastewater and product water after subsequent treatment by a UV/H2O2 advanced oxidation process (AOP) were 2.2 and 22.5 nM (0.17 and 1.7 μg/L), respectively. UV irradiation of RO permeate in the laboratory using a low-pressure Hg lamp confirmed the formation of methyl nitrate in the permeate in the absence of H2O2 and residual chloramines. This chemiluminescent detection method for methyl nitrate will promote a greater understanding of the origin and formation of this treatment byproduct in reclaimed wastewater.

    DOI: 10.1016/j.chemosphere.2023.140308

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  • Takashi Tomiyasu, Hideaki Matsuki, Masanori Oda, Hitoshi Kodamatani, Ryo Kanzaki, Toru Kobari .  Impact of mercury discharged from submarine volcano on inner bay ecosystems .  Chemosphere339   139748   2023.10Reviewed

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    Organic mercury, inorganic mercury and total mercury concentrations in phytoplankton (<0.1 mm) and zooplankton (>0.1 mm) collected in Kagoshima Bay, Japan were measured from 2017 to 2019 to estimate the impact of mercury discharged from submarine volcanoes on ecosystems; submarine volcanic activity continues at a depth of 200 m in the inner part of Kagoshima Bay. The total mercury concentrations in phyto- and zooplankton collected by vertical hauling at 0–200 m at just above the submarine volcano were in the range of 0.11–2.0 mg kg−1 (avg. 0.67 mg kg−1) and 0.090–0.56 mg kg−1 (avg. 0.21 mg kg−1), respectively. These values were one order of magnitude higher than the values in plankton collected in the central part of Kagoshima Bay. Organic mercury concentrations in phyto- and zooplankton were <0.010–0.071 mg kg−1 (avg. 0.028 mg kg−1) and 0.012–0.25 mg kg−1 (avg. 0.10 mg kg−1), respectively, for the inner part, and <0.010–0.040 mg kg−1 (avg. 0.010 mg kg−1) and <0.010–0.025 mg kg−1 (avg. 0.012 mg kg−1), respectively, for the central part. The values obtained in the inner part of the bay increased in summer and decreased in winter, which was consistent with changes in seawater mercury concentrations affected by volcanic activity. The organic mercury concentration in zooplankton collected just above the submarine volcano showed a size dependency, and a higher value was observed in the larger size, which suggested that the discharged mercury from the volcano was absorbed and concentrated through the ecosystem.

    DOI: 10.1016/j.chemosphere.2023.139748

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  • Tomiyasu T., Nozoe C., Ruiz W.L.G., Kodamatani H., Kanzaki R. .  Distribution of selenium and mercury concentrations in sediments of Kagoshima Bay: can submarine volcanic activity affect the distribution of selenium in sediments? .  Environmental Earth Sciences82 ( 20 )   2023.10Reviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Environmental Earth Sciences  

    Strong geothermal activity is observed at the bottom of Kagoshima Bay. The impact of volcanic activity on the sediment can be estimated by using the mercury concentration as an indicator. In this study, the distribution of selenium in the sediment of Kagoshima Bay was investigated and compared with the mercury concentration to estimate the impact of submarine volcanic activity on the selenium concentration in sediment. The selenium concentrations in sediment from 7 locations were in the range of 0.24–0.54 mg kg−1, which is approximately equal to the world shale average of 0.6 mg kg−1. A positive correlation was observed between total organic content and selenium, which suggested that the primary source of selenium in sediment is marine biological materials. On the other hand, in the geothermal area, the higher the mercury concentration is, the higher the Se concentration, which suggests that geothermal activity supplies selenium to the surrounding sediment.

    DOI: 10.1007/s12665-023-11159-9

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  • Ryo Kanzaki, Tomoya Hidaka, Hitoshi Kodamatani, Takashi Tomiyasu .  Determination of autoprotolysis (autoionization) constant according to gran's procedure on potentiometric titrations .  Journal of Molecular Liquids384   2023.8Reviewed

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    Gran's plot is an ingenious tool to find endpoints in potentiometric neutralization titrations. It can also be utilized for determining the formal potential of the electrodes, which is required in the case of obtaining the hydrogen ion concentration with pH sensor electrodes involving glass electrodes. Furthermore, autoprotolysis constants can be determined through Gran's plots with high accuracy, even those containing impurities. Gran's plot is thus a fundamental technique for investigating the properties of novel solvents such as protic ionic liquids as acid-base media. However, there are limitations in the autoprotolysis constants of the solvents and the ionization constants of the impurities, and so on, where Gran's plots work well. Hence, we have clarified the reliable range of these constants to be determined through Gran's plot by calculating the titration curves under various conditions and simulating these determination processes.

    DOI: 10.1016/j.molliq.2023.122180

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  • Takashi Tomiyasu, Ryohei Shitauchi, Daigo Kasai, Toshiki Kitagawa, Hitoshi Kodamatani, Ryo Kanzaki .  The distribution and dynamics of residual mercury from the Chisso chemical plant in sediments of the Yatsushiro Sea, western Kyushu, Japan: have recent sedimentations lowered surface mercury concentrations? .  Environmental Science and Pollution Research30 ( 28 ) 72769 - 72781   2023.6Reviewed International journal

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    To determine the long-term dynamics of mercury discharged from Chisso chemical plant between 1932 and 1968, the vertical variation in mercury concentrations in Yatsushiro Sea sediments was studied from 2013 to 2020 at 31 locations and compared to the mercury concentration distribution obtained in 1996. The results suggest that new sedimentation occurred after 1996, but the mercury concentrations at the surface ranged from 0.2 to 1.9 mg kg-1, which did not decrease significantly over a 20-year period. It was estimated that approximately 17 t of mercury remained in the southern Yatsushiro Sea sediment, which is equivalent to 10-20% of the total mercury discharged between 1932 and 1968. From results of WD-XRF and TOC measurement, it was suggested that mercury in sediment had been transported with suspended particles derived from sludges from the chemical plant and further suggests that the suspended particles derived from the sediment surface layer are still slowly diffusing.

    DOI: 10.1007/s11356-023-27505-0

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  • Hitoshi Kodamatani, Shotaro Kubo, Akinori Takeuchi, Ryo Kanzaki, Takashi Tomiyasu .  Sensitive Detection of Nitrite and Nitrate in Seawater by 222 nm UV-Irradiated Photochemical Conversion to Peroxynitrite and Ion Chromatography-Luminol Chemiluminescence System .  Environmental Science and Technology57 ( 14 ) 5924 - 5933   2023.4Reviewed International journal

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    Sensitive detection methods for nitrite (NO2-) and nitrate (NO3-) ions are essential to understand the nitrogen cycle and for environmental protection and public health. Herein, we report a detection method that combines ion-chromatographic separation of NO2- and NO3-, on-line photochemical conversion of these ions to peroxynitrite (ONOO-) by irradiation with a 222 nm excimer lamp, and chemiluminescence from the reaction between luminol and ONOO-. The detection limits for NO2- and NO3- were 0.01 and 0.03 μM, respectively, with linear ranges of 0.010-2.0 and 0.10-3.0 μM, respectively, at an injection volume of 1 μL. The results obtained by the proposed method for seawater analysis corresponded with those of a reference method (AutoAnalyzer based on the Griess reaction). As luminol chemiluminescence can measure ONOO- at picomolar concentrations, our method is expected to be able to detect NO2- and NO3- at picomolar concentrations owing to the high conversion ratio to ONOO- (>60%), assuming that contamination and background chemiluminescence issues can be resolved. This method has the potential to emerge as an innovative technology for NO2- and NO3- detection in various samples.

    DOI: 10.1021/acs.est.3c00273

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  • Hitoshi Kodamatani, Karin Kubozono, Ryo Kanzaki, Takashi Tomiyasu, Takahiro Fujioka .  Reverse osmosis membrane-based pretreatment for the quantification of N-nitrosodimethylamine concentrations in high-matrix water samples .  Environmental Science: Water Research and Technology   2023Reviewed

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    N-Nitrosodimethylamine (NDMA) is a carcinogenic constituent commonly found in recycled water and pharmaceuticals. Developing an analytical method to continuously monitor changes in NDMA concentrations during water recycling and pharmaceutical manufacturing can mitigate accidents caused by NDMA formation. However, NDMA analysis in high-matrix water samples, such as beverages, wastewater, and pharmaceutical ingredients, is difficult. In this study, we adapted reverse osmosis (RO) membrane treatment as a pretreatment for NDMA analysis by isolating NDMA from interfering substances in high-matrix water samples. Subsequently, high-performance liquid chromatography-chemiluminescence detection was used for NDMA analysis. In a pure water matrix, 95% of NDMA can pass through at a low permeate flux of 1 L m−2 h−1. The method was then validated using beer, which is known to contain high concentrations of NDMA, as a representative high-matrix water sample. We found that RO pretreatment leads to clean chromatograms in which NDMA peaks are clearly visible while other peaks are mostly absent. Analysis of six different beer samples showed a maximum NDMA concentration of 315 ng L−1, and an average NDMA concentration of 138 ± 83 ng L−1 (n = 6), which fall within the regulation limits for NDMA in beer in the United States of America. The proposed pretreatment method has the potential to provide a platform for developing technologies for continuous monitoring of NDMA in aqueous solutions.

    DOI: 10.1039/d3ew00222e

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  • Takashi Tomiyasu, Sora Yasumatsu, Hitoshi Kodamatani, Ryo Kanzaki, Chisato Takenaka, Satoshi Murao, Shuichi Miyagawa, Kenichi Nonaka, Akiko Ikeguchi, Ian A. Navarrete .  The dynamics of mercury around an artisanal and small-scale gold mining area, Camarines Norte, Philippines .  Environmental Science and Pollution Research   2022.10Reviewed International coauthorship

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    DOI: https://doi.org/10.1007/s11356-022-23497-5

  • Tomiyasu T., Mitsui A., Mitarai M., Kodamatani H., Kanzaki R. .  Seasonal variation in mercury species in seawater of Kagoshima Bay, southern Kyushu, Japan: The impact of active submarine volcanos on the inner bay .  Marine Chemistry244   2022.7Reviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Marine Chemistry  

    Wakamiko Proto-Caldera, a submarine volcano, is located at the bottom of the sea in the bay head area of Kagoshima Bay. In Kagoshima Bay, several species of fish with total mercury exceeding the provisional regulation value of 0.40 mg kg−1 were found in the 1970s. The effects of mercury released from submarine volcanoes are suspected. However, the path from volcanic mercury to the broader ecosystem has not yet been clarified. In this study, as the first step to elucidate the impact of volcanic activity on the ecosystems of Kagoshima Bay, seasonal changes in the concentrations of dissolved gaseous mercury (DGM), Hg(II), filtered total mercury (FT-Hg), particulate mercury (P-Hg), and mercury in suspended particulate matter (Hg in SPM) in seawater of Kagoshima Bay were tracked every two months from Feb. 2014 to Dec. 2017. The dissolved total mercury (DT-Hg) concentration was calculated by summing the DGM and FT-Hg concentrations. The DT-Hg at the location in the caldera ranged from 0.09 to 6.83 ng L−1 showing higher values in summer compared to winter, that is, in the stratified period. The P-Hg showed similar periodic variation as DT-Hg, and the highest Hg in SPM was 2.15 mg kg−1, which is one order of magnitude higher than that observed at the reference site. The high mercury concentration in SPM suggests the accumulation of dissolved mercury discharged from volcanic activity on SPM. Since mercury loaded on SPM can be taken up by suspension feeders and enter the food chain, the Hg in SPM may be a key factor affecting Hg in fishes in Kagoshima Bay.

    DOI: 10.1016/j.marchem.2022.104133

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  • Kodamatani H. .  Distribution, alkylation, and migration of mercury in soil discharged from the Itomuka mercury mine .  Science of the Total Environment815   152492   2022.4Reviewed

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Science of the Total Environment  

    The purpose of this study was to investigate the behavior of previously discharged mercury (Hg) released from the Itomuka Hg mine into the surrounding environment, especially into soil. Total-Hg (T-Hg), methylmercury (MeHg), and ethylmercury (EtHg) concentrations in the surface soil at eight sample sites around the mine were 3.8–64.2 mg/kg, 6.0–54.7 μg/kg, and undetected to 4.5 μg/kg, respectively. Core samples collected from seven of the eight sample sites showed that the vertical distribution of T-Hg was the highest in the surface soil layer and decreased rapidly in the lower layers. A strong positive correlation was observed between T-Hg and MeHg concentrations in the core samples; however, the slope of the regression line varied considerably for each core. This suggests that Hg and MeHg were not supplied from the atmosphere simultaneously, but rather that MeHg was produced on-site. Further, the formation of MeHg and EtHg in soil was considered in terms of the total organic carbon/total nitrogen ratio, which is a decomposition index of soil organic matter. The strong positive correlation between T-Hg and MeHg can be attributed to the migration of organic matter containing Hg species to the lower layers. There was no relationship between T-Hg and MeHg at the riverbed sample site because of the high T-Hg in the lower soil layers, suggesting that Hg was supplied by ore at this sample site. These assumptions of the formation change and migration of Hg in soil were supported by the results of the fractionation experiment and the elution test. To understand the current conditions in this area, measurements of Hg in the water, sediment, atmosphere, and plants were also conducted.

    DOI: 10.1016/j.scitotenv.2021.152492

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  • Kanzaki R. .  Enthalpy profile of pH-induced flocculation and redispersion of polyacrylic acid-coated nanoparticles in protic ionic liquid, N,N-diethylethanolammonium trifluoromethanesulfonate .  Journal of Molecular Liquids349   2022.3Reviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Molecular Liquids  

    Maghemite nanoparticles coated with polyacrylic acid (pAA) were dispersed in the protic ionic liquid, diethylethanolammonium trifluoromethanesulfonate (DEEAH+⋅TfO−), and the thermodynamics of particle dispersion was studied by means of potentiometric and calorimetric titrations over the entire accessible pH range. As previously reported, the domain of colloidal stability is divided into two pH regions, mildly acidic and basic, separated by a flocculation domain at an intermediate pH. In this study, solvent DEEAH+⋅TfO− was first characterized in terms of the thermodynamic parameters of two reference reactions: autoprotolysis and ionization of acetic acid. A negative autoprotolysis entropy is obtained due to hydrogen-bond formation between the neutralized solvent cation, DEEA, and the neighboring cation DEEAH+. This suggests that the solvent structure is reinforced by the formation of neutral species, being an opposite trend to both ethylammonium nitrate and water. Second, the ionization and flocculation of pAA-coated nanoparticles (CNps) in the ionic liquid were examined. The potentiometric results could be modeled using a simple pAA ionization, independent of the aggregation state over the entire pH range. However, the calorimetric titration detected extra heat generation in an acidic condition prior to flocculation, in addition to an ionization enthalpy of pAA of 30 kJ/mol. This exothermic contribution is attributed to a change in the solvation process of CNps in the ionic liquid. Herein, we propose a model in which different types of solvation in the acidic and basic domains are sufficient to ensure colloidal stability, while aggregation unfolds between the switching pH.

    DOI: 10.1016/j.molliq.2021.118146

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  • My Thi Tra Ngo, Binh Quoc Diep, Hideaki Sano, Yasuhisa Nishimura, Sandrine Boivin, Hitoshi Kodamatani, Haruka Takeuchi, Satya Candra Wibawa Sakti, Takahiro Fujioka .  Membrane distillation for achieving high water recovery for potable water reuse .  Chemosphere288 ( Pt 3 ) 132610   2022.2Reviewed

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Achieving high water recovery using reverse osmosis membranes is challenging during water recycling because the increased concentrations of organics and inorganics in wastewater can cause rapid membrane fouling, necessitating frequent cleaning using chemical agents. This study evaluated the potential of membrane distillation to purify reverse osmosis-concentrated wastewater and achieve 98% overall water recovery for potable water reuse. The results indicate that membrane fouling during membrane distillation treatment was low (4% reduction in permeability) until 98% water recovery. In contrast, membrane fouling during reverse osmosis treatments was high (73% reduction in permeability) before reaching 90% water recovery. Furthermore, membrane distillation showed superior performance in removing dissolved ions (99.9%) from wastewater as compared with reverse osmosis (98.9%). However, although membrane distillation removed most trace organic chemicals tested in this study, a negligible rejection (11%) was observed for N-nitrosodimethylamine, a disinfection byproduct regulated in potable water reuse. In contrast, RO treatment exhibited a high removal of N-nitrosodimethylamine (70%). Post-treatment (e.g., advanced oxidation) after reverse osmosis and membrane distillation may be needed to comply with the N-nitrosodimethylamine regulations. Overall, the membrane distillation process had the capacity to purify reverse osmosis concentrate with insignificant membrane fouling.

    DOI: 10.1016/j.chemosphere.2021.132610

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  • Hai Duc Minh Tran, Sandrine Boivin, Hitoshi Kodamatani, Keisuke Ikehata, Takahiro Fujioka .  Potential of UV-B and UV-C irradiation in disinfecting microorganisms and removing N-nitrosodimethylamine and 1,4-dioxane for potable water reuse: A review. .  Chemosphere286 ( Pt 2 ) 131682 - 131682   2022.1Reviewed International journal

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    The ultraviolet (UV)-based advanced oxidation process (AOP) is a powerful technology for removing pathogenic microorganisms and contaminants of emerging concern (CECs) from water. AOP in potable water reuse has been predominantly based on traditional low-pressure mercury (LP-Hg) lamps at 254 nm wavelength, supplemented by hydrogen peroxide addition. In this review, we assessed the potential of unconventional UV wavelengths (UV-B, 280-315 nm and UV-C, 100-280 nm) compared to conventional one (254 nm) in achieving the attenuation of pathogens and CECs. At the same UV doses, conventional 254 nm LP-Hg lamps and other sources such as, 222 nm KrCl lamps and 265 nm UV-LEDs, showed similar disinfection capability for viruses, protozoa, and bacteria, and the effect of hydrogen peroxide (H2O2) addition on disinfection remained unclear. The attenuation levels of key CECs in potable water reuse (N-nitrosodimethylamine and 1,4-dioxane) by 185 + 254 nm LP-Hg or 222 nm KrCl lamps were generally greater than those by conventional 254 nm LP-Hg and other UV lamps. CEC degradation was generally enhanced by H2O2 addition. Overall, our review suggests that 222 nm KrCl or 185 + 254 nm LP-Hg lamps with the addition of H2O2 would be the best alternative to conventional 254 nm LP-Hg lamps for achieving target removal levels of both pathogens and CECs in potable water reuse.

    DOI: 10.1016/j.chemosphere.2021.131682

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  • Tomiyasu T., Yasumatsu S., Kodamatani H., Kanzaki R., Takenaka C., Murao S., Miyagawa S., Nonaka K., Ikeguchi A., Navarrete I.A. .  The dynamics of mercury around an artisanal and small-scale gold mining area, Camarines Norte, Philippines .  Environmental Science and Pollution Research   2022

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    Language:Japanese   Publisher:Environmental Science and Pollution Research  

    To elucidate the dynamics of mercury emitted and released by artisanal and small-scale gold mining (ASGM) activity and to estimate its impact on the ecosystems of the bay, the distribution of mercury in the atmosphere, soil, water, and sediment around Mambulao Bay, Camarines Norte, Philippines, was investigated. The ASGM operations use mercury to extract gold from ore and are located on the east shore side of the bay. Samplings were conducted in August 2017 and September 2018. The samples were used for determination of total mercury (T-Hg) and organic mercury (org-Hg) concentrations, total organic carbon (TOC) content, and chemical composition. The atmospheric mercury concentration on the east shore side, 6.1–25.8 ng m−3, was significantly higher than the value of 1.4–9.9 ng m−3 observed on the west shore side. The average concentrations of T-Hg in the forest soils of the west shore side and those of the east shore side were 0.081 ± 0.028 mg kg−1 and 0.496 ± 0.439 mg kg–1, respectively. In the vertical distribution of T-Hg in the soil of the east shore side, a higher concentration was observed near the surface. For the vertical variations in T-Hg in the marine sediment, higher values were observed near the estuary, and the vertical variations in core samples showed an increase in mercury concentration toward the surface. The highest concentration of T-Hg in sediment, 9.5 mg kg−1, which was 2 orders of magnitude higher than the background levels of this area, was found near the river mouth. The T-Hg, org-Hg, and TOC levels showed a positive correlation, suggesting that the rivers are the main sources of T-Hg and org-Hg in the bay. Although the fish sample containing a mercury content higher than the regulatory level for fish and shellfish of 0.4 mg kg−1 in Japan was only one of 42 samples, the percentage of org-Hg in fish samples was 91 ± 18%. Mercury released into the surroundings by the ASGM activities can be converted into methylmercury and affect the bay’s ecosystem.

    DOI: 10.1007/s11356-022-23497-5

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  • Takahiro Fujioka, Hitoshi Kodamatani, Hai Duc Minh Tran, Atsushi Fujioka, Koki Hino, Takumi Yoshikawa, Daisuke Inoue, Keisuke Ikehata .  Degradation of N-nitrosamines and 1,4-dioxane using vacuum ultraviolet irradiation (UV254+185 nm or UV172 nm) .  CHEMOSPHERE278   130326   2021.9Reviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Advanced oxidation processes (AOPs) play a vital role in attenuating contaminants of emerging concern (CECs) during potable water reuse. AOPs are conventionally performed by irradiating with a 254-nm low-pressure (LP) mercury-vapor (Hg) ultraviolet (UV) lamp along with chemical treatment. Compared with UV-C light treatment (200-280 nm), vacuum-UV (V-UV) light treatment (100-200 nm) is advantageous in terms of hydroxyl radical generation without the requirement for chemical treatment. This study assessed the potential of V-UV (172-nm Xe-2 excimer or 185 + 254-nm LP-Hg) lamps on the destruction of two major CECs in potable water reuse, namely N-nitrosodimethylamine (NDMA) and 1,4-dioxane. Direct irradiation using UV254 (nm) or UV185+254 nm lamps achieved >= 94% removal of N-nitrosamines, including NDMA, at a UV dose of 900 mJ/cm(2). In contrast, the Xe-2 excimer lamp (UV172 nm) was less effective for N-nitrosamine removal, achieving up to 82% removal of NDMA. The removal of 1,4-dioxane by V-UV lamps at a UV dose of 900 mJ/cm(2) reached 51% (UV172 nm) and 28% (UV185+254 nm), both of which results were superior to that obtained using a conventional UV254 nm lamp (10%). The addition of hydrogen peroxide during UV254 nm or UV185+254 nm irradiation was found to enhance the removal of 1,4-dioxane, while UV172 nm irradiation without hydrogen peroxide addition still exhibited greater efficiencies than those UV254 nm lamps-based AOPs. Overall, this study demonstrated that the removal of both NDMA and 1,4-dioxane can be successfully achieved using either a UV254+185 nm lamp with hydrogen peroxide or a UV172 (nm) Xe-2 excimer lamp without hydrogen peroxide. (C) 2021 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.chemosphere.2021.130326

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  • Hitoshi Kodamatani, Daisuke Yoshimine, Takahiro Fujioka, Ryo Kanzaki, Takashi Tomiyasu .  A novel luminol chemiluminescence induced by photoexcited ketones: A selective determination method for acetone in wastewater .  Talanta open3   100035 - 100035   2021.8Reviewed

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.talo.2021.100035

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  • Hitoshi Kodamatani, Taketo Tanisue, Takahiro Fujioka, Ryo Kanzaki, Takashi Tomiyasu .  Inhibitory effect of alkyl groups on N-nitrosamine formation from secondary and tertiary alkylamines with monochloramine .  ENVIRONMENTAL TECHNOLOGY & INNOVATION22   2021.5Reviewed

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    N-nitrosamines are contaminants of emerging concern, and controlling these chemicals in potable water and recycled water for potable reuse has become important for protecting public health. This study aimed to evaluate the influence of the alkyl chain lengths of N-nitrosamine precursors (secondary and tertiary amines) on the formation of N-nitrosamines via chloramination. The molar conversion efficiency from dimethylamine, an N-nitrosodimethylamine (NDMA) precursor, to NDMA (0.67%) was greater than that from diethylamine, an N-nitrosodiethylamine (NDEA) precursor, to NDEA (0.38%). Similarly, the molar conversion efficiency from trimethylamine to NDMA (0.92%) was greater than from triethylamine to NDEA (0.33%). Interestingly, a considerable difference in molar conversion efficiencies were observed for tertiary amines with the N,N-dialkyla-arylamine structure: the molar conversion efficiencies from N,N-dimethylbenzylamine and N,N-diethylbenzylamine to NDMA and NDEA were 50.2% and 1.7%, respectively. These results indicate that amines with ethyl groups have lower potentials for producing the corresponding N-nitrosamines than those with methyl groups. These differences in yields between amines with methyl and ethyl groups can be explained by the difference in electron density in the nitrogen atom of the amine, which influences the protonation of the amine and stabilization of intermediate species. These findings could be useful for enhancing source control of water and wastewater by regulating runoff or industrial wastewater containing high concentrations of specific N-nitrosamine precursors. (C) 2021 Elsevier B.V. All rights reserved.

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  • Takashi Tomiyasu, Misato Nakagawa, Hitoshi Kodamatani, Ryo Kanzaki .  The influence of submarine volcano on seasonal changes in arsenic in the waters of Kagoshima Bay, southwestern Japan .  ENVIRONMENTAL EARTH SCIENCES80 ( 8 )   2021.4Reviewed

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    Volcanic activity is one of the primary sources of arsenic in nature, and chemical forms of arsenic discharged by volcanic activity are inorganic. Kagoshima Bay has active submarine volcano located in the 200 m deep basin of its northern part. Since dissolved inorganic arsenic is more toxic than organic arsenic it is important to understand the dispersion of discharged arsenic in seawater. To estimate the influence of arsenic emitted from the bottom vents seasonal changes in As(III) and As(V) concentrations in seawater were studied. There are few studies on the impact of arsenic discharged by submarine volcanos in the inner bay. The total concentrations of As(III) and As(V) (T-As) in seawater at the background site in Kagoshima Bay was 1.71 +/- 0.35 mu g L-1 (av. +/- s.d.), similar to the world average value of 1.7 mu g L-1. The highest T-As value at the nearest point to the submarine volcano, 3.48 mu g L-1, was observed in summer. Since the vertical mixing of seawater cannot occur in summer due to the formation of the thermocline, the deep water is strongly affected by volcanic activity. The increase in T-As was caused by the increase in As(III) concentration suggesting the discharge of As(III) from the vents.

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  • Noda Kazutoshi, Kodamatani Hitoshi, Tomiyasu Takashi, Marumoto Kohji, Komai Takeshi, Aizawa Hidenobu .  Measurement System of Mercury in Water Samples by Reduction Vaporization Method Using a Quartz Crystal Microbalance .  IEEJ Transactions on Sensors and Micromachines141 ( 2 ) 50 - 54   2021.2Reviewed

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    <p>To reduce the environmental risks posed by mercury (Hg), a simple and rapid detection system for Hg in the environment is needed. We developed a simple Hg measurement method for detecting of Hg in liquid phase using quartz crystal microbalance (QCM-Hg). Mercury is reduced into Hg<sup>0</sup> by adding the reducing solution (SnCl<sub>2</sub>) to the divalent Hg<sup>2+</sup> in the sample solution. Then, Hg is turned into vapor in reactor bottle by flowing air. It (QCM-Hg) utilizes the direct reaction of Hg and the Au electrode of the quartz crystal element via the phenomenon of Au-Hg amalgamation. In the case of 0.0005 mg/L in liquid phase, a frequency shift of about 13 Hz is obtained using a 20 MHz quartz crystal element. This new detection system allows easy measurement of very low concentrations of Hg in liquid phase.</p>

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  • Ishitani Yoshimasa, Kitamura Yujin, Kawabata Kuniyo, Kodamatani Hitoshi .  (entry) Underground structures seen from the characteristics of groundwater in northwestern Kagoshima Prefecture .  Annual Meeting of the Geological Society of Japan2021 ( 0 ) 310   2021(entry) Underground structures seen from the characteristics of groundwater in northwestern Kagoshima Prefecture

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    DOI: 10.14863/geosocabst.2021.0_310

  • Takahiro Fujioka, Miyu Osako, Shuji Tanabe, Hitoshi Kodamatani, Takuji Shintani .  Plugging nonporous polyamide membranes for enhanced rejection of small contaminants during advanced wastewater treatment .  Separation and Purification Technology253   1179490   2020.12Reviewed

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    © 2020 Elsevier B.V. Removing N-nitrosodimethylamine (NDMA), a regulated carcinogenic chemical, with a reverse osmosis (RO) membrane is a key challenge for enhancing the safety of reused potable water. This study aimed to achieve high rejection of NDMA and salts by plugging the nanopores in an RO membrane with linear-chain amines, amides, and epoxides. Plugging with amines or epoxides generally led to a reduction in water permeance and an increase in conductivity rejection. NDMA rejection increased linearly with the size of amines. The RO membrane plugged with dodecylamine exhibited an NDMA rejection of 80% when treating the effluent from a membrane bioreactor, and this performance was maintained for 8 d. In contrast, amide or epoxide plugs resulted in only minor improvements in NDMA rejection. We speculate that the amine plugs remain in the nanopores through electrostatic attractions, whereas amides and epoxides become readily detached from the nanopores because they are only bound through weaker hydrogen-bonding interactions. This study provides an understanding of the plugging mechanism that enhances NDMA rejection and demonstrated high NDMA rejection using treated wastewater.

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  • Robert Reny, Megan H Plumlee, Hitoshi Kodamatani, I H Mel Suffet, Shannon L Roback .  NDMA and NDMA precursor attenuation in environmental buffers prior to groundwater recharge for potable reuse. .  The Science of the total environment762 ( 1 ) 144287 - 144287   2020.12Reviewed International journal

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    Natural attenuation of N-nitrosodimethylamine (NDMA) and NDMA precursors was evaluated in infiltration basins, a riverbed filtration system, and constructed wetlands operated as part of a managed aquifer recharge system. Initial NDMA concentrations up to 9.0 ng/L in infiltration basins (advanced purified, recycled water) before sunrise declined to non-detect (<1.5 ng/L) by 10:00 A.M due to natural photolysis (half-life of 33 to 86 min dependent on solar irradiance). NDMA fortified controls adjacent to the infiltration basin showed similar results, while concentrations in dark controls did not change over the basin's hydraulic retention time. NDMA precursor concentrations did not change significantly in the basin containing advanced-treated water from a potable reuse treatment plant, indicating that photolysis did not remove NDMA precursors nor did photolysis produce a significant amount of precursors. For the other environmental buffers evaluated, NDMA removal was variable through laboratory scale soil columns (22 cm height), in full-scale riverbed filtration system that pre-filters water prior to infiltration basin recharge, and in the constructed wetland. Variability in NDMA removal through the wetlands is attributed to high turbidity. In the case of the riverbed filtration system, variability is likely due to short exposure times to sunlight. For the soil columns, limited NDMA removal is attributed to inefficacy of soil aquifer treatment in removing NDMA over short travel times/distances. NDMA precursors were also ineffectively removed in these systems, with effluent concentrations occasionally exceeding influent concentrations. Overall, the removal of NDMA in environmental buffers utilized for planned or de facto indirect potable reuse is dependent on the system's capacity for photolysis, while NDMA precursors are more recalcitrant and unlikely to be removed in such systems without enhancement or sufficient hydraulic residence times.

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  • Takahiro Fujioka, Hitoshi Kodamatani, Takumi Yoshikawa, Daisuke Inoue, Keisuke Ikehata .  Assessment of 265-nm UV-LED for direct photolysis and advanced oxidation of N-nitrosamines and 1,4-dioxane .  Environmental Technology & Innovation20 ( 6 ) 101147   2020.11Assessment of 265-nm UV-LED for direct photolysis and advanced oxidation of N-nitrosamines and 1,4-dioxaneReviewed

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  • Takahiro Fujioka, Hitoshi Kodamatani, Takumi Yoshikawa, Daisuke Inoue, Keisuke Ikehata .  Assessment of 265-nm UV-LED for direct photolysis and advanced oxidation of N-nitrosamines and 1,4-dioxane .  Environmental Technology and Innovation20   2020.11Reviewed

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    © 2020 Elsevier B.V. The advanced oxidation process (AOP), using conventional low-pressure mercury (LP Hg)-vapor UV lamps, forms a critical barrier for pathogens and contaminants of emerging concern (CECs) in potable water reuse. In recent years, UV-light-emitting diode (UV-LED) has attracted considerable attention as an alternative UV source because it has a long lifetime and is mercury-free. This study assesses the effectiveness of 265-nm UV-LED in removal of characteristic CECs, 1,4-dioxane (100 μg/L) and N-nitrosamines (500 ng/L), including N-nitrosodimethylamine (NDMA), in recycled potable water. Direct photolysis using a UV-LED lamp, at the maximum UV dose of 900 mJ/cm2, achieved a maximum of 31% NDMA reduction, as opposed to a 93% reduction by a conventional LP Hg UV lamp. We attributed this to the longer emission wavelength of the UV-LED (265 nm) than that for the LP Hg UV lamp (254 nm). Both UV lamps failed to photolyze 1,4-dioxane. Using hydrogen peroxide or monochloramine remarkably enhanced the effectiveness of the LP Hg UV-based AOP in removing 1,4-dioxane, and the percentage of NDMA removed also increased slightly; however, it did not improve the effectiveness of the UV-LED-based AOP. We conclude from this study that despite the advantages of the UV-LED over the conventional LP Hg UV lamp, the former performs ineffectively at attenuating major CECs in recycled water.

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  • Takahiro Fujioka, Miyu Osako, Kaoru Oda, Takuji Shintani, Hitoshi Kodamatani .  Impact of heat modification conditions on the removal of N-nitrosodimethylamine by polyamide reverse osmosis membranes .  Separation and Purification Technology247   116921   2020.9Reviewed

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    © 2020 Elsevier B.V. Advanced wastewater treatment using a reverse osmosis (RO) membrane is a key separation process for ensuring the removal of chemical hazards so that treated wastewater can be used for potable purposes. This study systematically assesses the effects of heat modification conditions of three commercial RO membranes on the removal of a challenging chemical of emerging concern–N-nitrosodimethylamine (NDMA). The RO membranes were modified in pure water at the heat treatment temperature between 70 and 100 °C; 90–100 °C achieved the highest NDMA rejection during separation tests. A lower pH during heat treatment generally resulted in higher NDMA rejection, however a solution pH lower than four can reduce NDMA rejection depending on the presence of a protective layer on the RO membrane surface. Overall, a linear tradeoff between NDMA rejection and water permeance was commonly observed among the heat-treated RO membranes. The stability of a heat-modified membrane in water permeance and NDMA rejection was demonstrated over a week-long test using treated wastewater. The enhanced removal of NDMA by heat-treated RO membranes was speculated to occur due to the shrinking of the passage of solutes–free-volume holes. This study demonstrates the importance of heat modification conditions on RO membranes to achieve a high NDMA rejection.

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  • Hitoshi Kodamatani, Kenta Sugihara, Taketo Tanisue, Ryo Kanzaki, Takashi Tomiyasu .  Contamination, Decomposition, and Formation of N-Nitrosodimethylamine in Water Samples at the ng/L Level of Determination .  ANALYTICAL SCIENCES36 ( 11 ) 1393 - 1399   2020.7Reviewed

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    An ultra-sensitive analytical system that can determine the concentration of N-nitrosamines at the ng/L level without preconcentration was used to investigate the contamination, decomposition, and formation of N-nitrosodimethylamine (NDMA) and other N-nitrosamines in water samples during general analytical procedures. A preliminary experiment was performed to estimate the NDMA concentrations in ambient air. Since the air samples contained NDMA at concentrations in the range of 2.0 - 10.7 ng/m(3), ambient air was identified as the source of NDMA contamination in water samples. We directly confirmed that the concentration of aqueous 10-ng/L NDMA samples stored in clear glass bottles decreased upon exposure to sunlight. Thus, to maintain the N-nitrosamine concentration, such samples must always be protected from sunlight during sampling. The existence of N-nitrosamines in experimental reagents, such as ranitidine and sodium hypochlorite solutions, was also confirmed, as was the formation of NDMA on an activated carbon solid-phase extraction cartridge.

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  • Hitoshi Kodamatani, Yuri Daiba, Shintarou Morisaki, Katsuyuki Ichitani, Ryo Kanzaki, Takashi Tomiyasu .  Detailed investigation of methylmercury accumulation in rice grain from Hg<sup>2+</sup>-spiked non-contaminated paddy field soils .  Chemosphere247   125827   2020.5Reviewed

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    © 2020 Elsevier Ltd Total-Hg (T-Hg) and methylmercury (MeHg) concentrations in rice grains were measured to understand the MeHg accumulation process. Rice plants were cultivated in Hg2+-spiked non-contaminated soils in experimental pots at three different places. Although soil MeHg concentrations in the pots changed significantly and individually during the rice-growing season, T-Hg concentration of brown rice grain was high at high soil MeHg concentration. In addition, there was no significant variation in T-Hg concentration in brown rice grains from individual panicles or among panicles obtained from the same pot, although the period of growth for each panicle was different. The highest T-Hg concentration of brown rice grains recorded for a panicle was 1.4 ± 0.1 mg kg−1 (n = 8), and the corresponding MeHg ratio was 76%. In addition, the T-Hg and MeHg concentrations in various parts of the brown rice grain—white rice (endosperm), bran, and embryo—were measured. Among the parts of the brown rice grain, the embryo had the highest Hg concentration. Furthermore, Hg concentration in the grain was constant during grain filling. These findings suggest that MeHg formed in soil accumulates in the rice plant during growth and is supplied to the rice grains continuously for the entire duration of the grain development period.

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  • Koichi Haraguchi, Mineshi Sakamoto, Akito Matsuyama, Megumi Yamamoto, Dang T. Hung, Hiromitsu Nagasaka, Keisuke Uchida, Yasunori Ito, Hitoshi Kodamatani, Milena Horvat, Hing M. Chan, Matthew Rand, Ciprian M. Cirtiu, Byoung-Gwon Kim, Flemming Nielsen, Akane Yamakawa, Nikolay Mashyanov, Nikolai Panichev, Elena Panova, Tomoaki Watanabe, Naoki Kaneko, Jun Yoshinaga, Ranny F. Herwati, Alfrida E. Suoth, Hirokatsu Akagi .  Development of Human Hair Reference Material Supporting the Biomonitoring of Methylmercury .  ANALYTICAL SCIENCES36 ( 5 ) 561 - 567   2020.5Reviewed

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    A certified reference material, NIMD-01, was developed for the analysis of mercury speciation in human hair. We collected the hair of Vietnamese males from a barbershop in Hanoi in 2016 and prepared 1200 bottles containing 3 g of sieved and blended hair powder. The certified value was given on a dry-mass basis, with the moisture content obtained by drying at 85 degrees C for 4 h. Certified values with the expanded uncertainties (coverage factor, k = 2) were as follows: methylmercury, 0.634 +/- 0.071 mg kg(-1) as mercury; total mercury, 0.794 +/- 0.050 mg kg(-1); copper, 12.8 +/- 1.4 mg kg(-1); zinc, 234 +/- 29 mg kg(-1); selenium, 1.52 +/- 0.29 mg kg(-1). An indicative arsenic concentration of 0.17 +/- 0.03 mg kg(-1) was measured. Extended uncertainties were estimated by sample homogeneity, long- and short-term stabilities, and a characterization from measurements made by collaborating laboratories.

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  • Haraguchi Koichi, Sakamoto Mineshi, Matsuyama Akito, Yamamoto Megumi, Hung Dang T., Nagasaka Hiromitsu, Uchida Keisuke, Ito Yasunori, Kodamatani Hitoshi, Horvat Milena, Chan Hing M., Rand Matthew, Cirtiu Ciprian M., Kim Byoung-Gwon, Nielsen Flemming, Yamakawa Akane, Mashyanov Nikolay, Panichev Nikolai, Panova Elena, Watanabe Tomoaki, Kaneko Naoki, Yoshinaga Jun, Herwati Ranny F., Suoth Alfrida E., Akagi Hirokatsu .  メチル水銀の生体モニタリングを支援するための人毛の基準標本の開発(Development of Human Hair Reference Material Supporting the Biomonitoring of Methylmercury) .  Analytical Sciences36 ( 5 ) 561 - 567   2020.5メチル水銀の生体モニタリングを支援するための人毛の基準標本の開発(Development of Human Hair Reference Material Supporting the Biomonitoring of Methylmercury)

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  • Shannon L. Roback, Hitoshi Kodamatani, Takahiro Fujioka, Megan H. Plumlee .  Validation of a novel direct-injection chemiluminescence-based method for N-nitrosamine analysis in advanced-treated recycled water, drinking water, and wastewater .  Environmental Science: Water Research & Technology6 ( 4 ) 1106 - 1115   2020.4Reviewed

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  • Takashi Tomiyasu, Yuriko Kono Hamada, Christine Baransano, Hitoshi Kodamatani, Akito Matsuyama, Ryusuke Imura, Nuril Hidayati, Joeni Setijo Rahajoe .  Mercury concentrations in paddy field soil and freshwater snails around a small-scale gold mining area, West Java, Indonesia .  Toxicology and Environmental Health Sciences12 ( 1 ) 23 - 29   2020.3Reviewed

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    © 2020, Korean Society of Environmental Risk Assessment and Health Science. Objective: To estimate the impact of mercury released from an artisanal small-scale gold mining (ASGM) activities on the ecosystem. Methods: Total and organic mercury concentrations in paddy field soil and freshwater snails around an artisanal small-scale gold mining area were investigated. Paddy field soil samples and freshwater snails were collected from ten sites along the Cikaniki River. A site located in a national park, which was approximately 12 km upstream from the ASGM site, was considered the reference site for this study. Results: The organic mercury concentration in soil samples collected at the ASGM site was n.d.–0.018 mg kg−1 and that at the reference site was 0.005–0.008 mg kg−1. The organic mercury concentrations in the freshwater snails collected at the ASGM and reference sites were 0.38 ± 0.21 mg kg−1 (31.0 ± 26.6% of total mercury, n = 38) and 0.056 ± 0.032 mg kg−1 (40.5 ± 11.5% of total mercury, n = 16), respectively. Conclusion: Although the original form of mercury in the mining waste was elemental mercury and/or Hg2+, the mercury form changed to organic mercury in environment and the organic mercury was concentrated two orders of magnitude, even in low-order organisms.

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  • Takashi Tomiyasu, Christine Baransano, Yuriko Kono Hamada, Hitoshi Kodamatani, Ryo Kanzaki, Nuril Hidayati, Joeni Setijo Rahajoe .  Distribution of total and organic mercury in soils around an artisanal and small-scale gold mining area in West Java, Indonesia .  SN APPLIED SCIENCES2 ( 7 ) 1213   2020Reviewed

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    This study was conducted to understand the environmental behavior of mercury released by artisanal and small-scale gold mining (ASGM) activities. For this purpose, we attempted to assess the effect of diffused mercury on mercury concentrations in soil, demonstrate the presence of methylmercury in soil affected by the deposited mercury and determine the reactions associated with methylmercury production. The vertical profiles of mercury were obtained from two sites in the forest of the ASGM village in Pongkor (West Java, Indonesia) and from two sites in Mount Halimun-Salak National Park, which is approximately 12 km from the ASGM village. The highest total mercury concentration, 8.9 mg kg(-1), was observed for soil samples collected at the ASGM village. The mercury was concentrated at the surface or in the subsurface layers, and the concentrations were several times to more than ten times higher than the lowest values observed in the deeper layers at each site. Even in the national park, the highest concentration of 1.9 mg kg(-1) was observed in the upper soil layer. These results suggest that the primary source of mercury in the forest soil is atmospheric deposition; fallen plant leaves also deliver accumulated mercury to the soil surface. The organic mercury percentages of the total mercury were 0.2 +/- 0.1% for the national park and 0.3 +/- 0.2% for ASGM sites. The vertical variation in organic mercury concentration did not always match that in total mercury concentration, which suggested that the formation of methylmercury in soil was closely related to the decomposition of organic matter near the surface. The soil surface is an important reaction field for methylmercury production in forested areas.

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  • Takahiro Fujioka, Hidenobu Aizawa, Hitoshi Kodamatani .  Fouling substances causing variable rejection of a small and uncharged trace organic chemical by reverse osmosis membranes .  Environmental Technology and Innovation17   100576   2019.12Reviewed

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    © 2019 Elsevier B.V. The safety of recycled water for potable water reuse can be enhanced by improving the reliability of reverse osmosis (RO) treatment for the removal of trace organic chemicals. This study assessed the mechanisms underlying the variable rejection of a carcinogenic N-nitrosamine, namely N-nitrosodimethylamine (NDMA), caused by RO membrane fouling. Foulants that cause the variable rejection were evaluated through rejection tests and foulant characterization. The RO treatment of wastewaters with and without pre-treatment using an ultrafiltration or nanofiltration membrane showed that NDMA rejection commonly increased with increasing membrane fouling. The characterization of organics in the treated wastewater samples revealed that increased NDMA rejection can be caused by foulants composed of low-molecular-weight organics (<300 Da), including tryptophan (or tryptophan-like substances). It is speculated that small organics such as tryptophan form a densely packed cake layer on the membrane surface, which may function as an additional barrier for the membrane transport of NDMA. The results of this study indicate that RO membrane fouling that occurs during long-term wastewater treatment can increase NDMA rejection. The enhanced separation performance can yield positive consequences for the credibility of RO treatment in potable water reuse.

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  • Takahiro Fujioka, Hitoshi Kodamatani, Wang Yujue, Koh Dan Yu, Elvy Riani Wanjaya, Han Yuan, Mingliang Fang, Shane Allen Snyder .  Assessing the passage of small pesticides through reverse osmosis membranes .  Journal of Membrane Science595   2019.10Reviewed

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    Attenuation of trace organic chemicals (TOrCs), including pesticides, by reverse osmosis (RO) membrane treatment is critical for ensuring public health protection in potable water reuse. This study aimed to elucidate the mechanisms underlying the poor rejection of small pesticides by polyamide-based RO membranes. Rejection of the selected TOrCs (four N-nitrosamines and 158 pesticides) was primarily governed by size exclusion, charge interactions, and dipolar interactions when evaluated at high water temperatures. Further investigation indicated that small and uncharged secondary amide pesticides showed low and highly variable rejections, compared to similarly sized counterparts with no amide functional groups. Remarkably, three secondary amide pesticides that have no other atoms holding a high partial negative charge showed very low rejections (34–65%), likely due to the cooperativity of hydrogen bonding which occurs between amide functional groups of the pesticides and RO membranes. In contrast, secondary amide pesticides that have an atom holding a high partial negative charge showed higher rejections (72–98%), likely due to the inducted electrostatic repulsion. This study proposed that secondary amide pesticides that have no other atoms holding a high partial negative charge can be poorly rejected. The findings are useful to predict the rejection level of unregulated TOrCs.

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  • Maxwell C. Meadows, Soni M. Pradhanang, Takahiro Fujioka, Hitoshi Kodamatani, Menu B. Leddy, Thomas B. Boving .  N-Nitrosodimethylamine Formation from Treatment of Seasonally and Spatially Varying Source Water .  Water11 ( 10 ) 2019   2019.9Reviewed

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  • Takahiro Fujioka, Hiro Yoshikawa, Masahiro Eguchi, Sandrine Boivin, Hitoshi Kodamatani .  Application of stabilized hypobromite for controlling membrane fouling and N-nitrosodimethylamine formation .  Chemosphere240   124939   2019.9Reviewed

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  • Kanzaki Ryo, Kodamatani Hitoshi, Tomiyasu Takashi .  Proton Thermodynamics in a Protic Ionic Liquid, Ethylammonium Nitrate .  CHEMISTRY-A EUROPEAN JOURNAL25 ( 59 ) 13500 - 13503   2019.8Reviewed

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  • Takahiro Fujioka, Haruka Takeuchi, Hiroaki Tanaka, Hitoshi Kodamatani .  A surrogate-based approach for trace organic chemical removal by a high-rejection reverse osmosis membrane .  Science of The Total Environment696   134002   2019.8Reviewed

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  • Sakamoto M, Itai T, Marumoto K, Marumoto M, Kodamatani H, Tomiyasu T, Nagasaka H, Mori K, Poulain AJ, Domingo JL, Horvat M, Matsuyama A .  Mercury speciation in preserved historical sludge: Potential risk from sludge contained within reclaimed land of Minamata Bay, Japan. .  Environmental research180   108668   2019.8Reviewed

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  • Tomiyasu Takashi, Hamada Yuriko Kono, Kodamatani Hitoshi, Hidayati Nuril, Rahajoe Joeni Setijo .  Transport of mercury species by river from artisanal and small-scale gold mining in West Java, Indonesia .  ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH26 ( 24 ) 25262 - 25274   2019.6Reviewed

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    To estimate the impact of mercury discharged from artisanal and small-scale gold mining (ASGM) activity, variations in the concentrations of elemental mercury (Hg0), mercury ion (Hg2+), particulate mercury (P-Hg), and total mercury in filtered river water (FT-Hg) were investigated from sampling locations extending from 10 km upstream to 30 km downstream of ASGM operations in West Java, Indonesia. The average of the annual concentrations at the ASGM site from 2013 to 2017 were 0.14-0.85 mu g L-1, 0.27-12.9 mu g L-1, 4.3-49.5 mu g L-1, and 1.2-12.5 mu g L-1 for Hg0, Hg2+, P-Hg, and FT-Hg, respectively. The concentration of mercury species decreased as the distance from the ASGM site increased, while the ratio of P-Hg increased towards the lower reaches of the river system, with the percentage of P-Hg estimated at 90% of Hg at the sample location furthest downstream. A high mercury concentration of 600 mg kg(-1) was observed for suspended particulate matter (SPM) at the ASGM site. The SPM maintained a high concentration of mercury, even in the downstream area. In the annual variations of the mercury species from 2013 to 2017, FT-Hg and P-Hg concentrations tended to decrease from 2016, which suggested a decline of ASGM activity in this area. However, SPM and river sediment showed no apparent changes in their mercury concentrations over this period, indicating that the contamination in the river system is persistent and does not recover quickly.

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  • Kitagawa Toshiki, Kasai Daigo, Shitauchi Ryouhei, Kodamatani Hitoshi, Kanzaki Ryo, Tomiyasu Takashi .  The distribution of residual mercury in sediment around Minamata Bay ,and the chemical composition of the sediment. .  Abstracts of Annual Meeting of the Geochemical Society of Japan66 ( 0 )   2019

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  • Nozoe Chihiro, Kodamatani Hitoshi, Kanzaki Ryo, Tomiyasu Takashi .  Distribution of mercury and selenium in sediments from Kagoshima Bay, and impact of submarine fumaroles .  Abstracts of Annual Meeting of the Geochemical Society of Japan66 ( 0 )   2019

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  • Takahiro Fujioka, Hitoshi Kodamatani, Long D. Nghiem, Takuji Shintani .  Transport of N-Nitrosamines through a Reverse Osmosis Membrane: Role of Molecular Size and Nitrogen Atoms .  Environmental Science and Technology Letters6 ( 1 ) 44 - 48   2018.12Reviewed

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    © 2018 American Chemical Society. Reliable and adequate removal of small and uncharged trace organic chemicals, particularly N-nitrosodimethylamine (NDMA) that is carcinogenic and known to occur in treated effluent, is essential for implementing direct potable water use. This study provides new insights to explain the low rejection of NDMA and other N-nitrosamines by reverse osmosis (RO) membranes by examining the role of molecular size and polarity in their molecular structure. The results show that molecular weight is not a suitable molecular property for evaluating the rejection of small uncharged chemicals. In this study, NDMA and two other uncharged chemicals have similar molecular weights (i.e., 72-74 g/mol), but their rejection by the ESPA2 RO membrane varied considerably from 30 to 88%. Instead, a minimum projection area was identified as a more suitable molecular property, indicating that size exclusion plays a primary role in their rejection. It was also determined that chemicals with more nitrogen atoms in their chemical structure consistently showed rejections lower than those of their similarly sized counterparts. The results suggest that chemicals bearing more nitrogen atoms (e.g., NDMA) have higher affinity to amide or amine functional group of a polyamide RO membrane possibly through hydrogen bonding interactions.

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  • Kanzaki Ryo, Daiba Hikaru, Kodamatani Hitoshi, Tomiyasu Takashi .  Validation of pH Standards and Estimation of the Activity Coefficients of Hydrogen and Chloride Ions in an Ionic Liquid, Ethylammonium Nitrate .  JOURNAL OF PHYSICAL CHEMISTRY B122 ( 46 ) 10593 - 10599   2018.11Reviewed

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  • Fujioka Takahiro, Kodamatani Hitoshi, Takeuchi Haruka, Tanaka Hiroaki, Nghiem Long D .  Online monitoring of N-nitrosodimethylamine for the removal assurance of 1,4-dioxane and other trace organic compounds by reverse osmosis .  ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY4 ( 12 ) 2021 - 2028   2018.9Reviewed

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    DOI: 10.1039/C8EW00271A

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  • Kodamatani Hitoshi, Katsuma Souta, Shigetomi Azusa, Hokazono Toshimune, Imura Ryusuke, Kanzaki Ryo, Tomiyasu Takashi .  Behavior of mercury from the fumarolic activity of Mt. Myoko, Japan: production of methylmercury and ethylmercury in forest soil .  ENVIRONMENTAL EARTH SCIENCES77 ( 13 ) 478 - 487   2018.6Reviewed

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  • Hitoshi Kodamatani, Shannon L. Roback, Megan H. Plumlee, Kenneth P. Ishida, Hiroto Masunaga, Noboru Maruyama, Takahiro Fujioka .  An inline ion-exchange system in a chemiluminescence-based analyzer for direct analysis of N-nitrosamines in treated wastewater .  Journal of Chromatography A1553   51 - 56   2018.4Reviewed

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    A newly developed, ion exchange-based inline pretreatment system was used to mitigate the effect of background constituents in natural water and treated wastewater to achieve rapid, reliable, and sensitive analysis of N-nitrosamines. The pretreatment system (anion exchange module, AEM) was incorporated into a high-performance liquid chromatograph (HPLC) coupled with a photochemical reactor (PR) and chemiluminescence (CL) detector (HPLC-PR-CL), which can analyze four hydrophilic N-nitrosamines at ng/L levels. This system requires no pre-concentration of the water sample nor the use of deuterated surrogates, unlike other conventional N-nitrosamine analytical techniques. The AEM converted anions in the eluent to hydroxide ions after HPLC separation and increased eluent pH, allowing for the subsequent photochemical reactions, which are otherwise achieved by pH conditioning with an additional dosing pump of basic chemical. The AEM also removed anionic interfering compounds (e.g. nitrate) from the samples, allowing for improved N-nitrosamine analysis in treated wastewater. The operating conditions of the AEM and PR were optimized to obtain sensitive and stable analytical performance. As a result, the lowest-concentration minimum reporting levels of N-nitrosodimethylamine, N-nitrosomorpholine, N-nitrosomethylethylamine, and N- nitrosopyrrolidine using the optimized system were 0.42, 0.54, 0.58, and 1.4 ng/L, respectively. The improved analytical method was validated by comparing the results with a conventional method based on gas chromatography coupled with a mass spectrometric ion trap detector. These results indicated that HPLC-PR-CL equipped with an inline AEM can be competitively applied as a rapid analytical technique for the determination of N-nitrosamines in various water matrices.

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  • Takahiro Fujioka, Kenneth P. Ishida, Takuji Shintani, Hitoshi Kodamatani .  High rejection reverse osmosis membrane for removal of N-nitrosamines and their precursors .  Water Research131   45 - 51   2018.3Reviewed

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    © 2017 Elsevier Ltd Direct potable reuse is becoming a feasible option to cope with water shortages. It requires more stringent water quality assurance than indirect potable reuse. Thus, the development of a high-rejection reverse osmosis (RO) membrane for the removal of one of the most challenging chemicals in potable reuse – N-nitrosodimethylamine (NDMA) – ensures further system confidence in reclaimed water quality. This study aimed to achieve over 90% removal of NDMA by modifying three commercial and one prototype RO membrane using heat treatment. Application of heat treatment to a prototype membrane resulted in a record high removal of 92% (1.1-log) of NDMA. Heat treatment reduced conductivity rejection and permeability, while secondary amines, selected as N-nitrosamine precursors, were still well rejected (>98%) regardless of RO membrane type. This study also demonstrated the highly stable separation performance of the heat-treated prototype membrane under conditions of varying feed temperature and permeate flux. Fouling propensity of the prototype membrane was lower than a commercial RO membrane. This study identified a need to develop highly selective RO membranes with high permeability to ensure the feasibility of using these membranes at full scale.

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  • Takahiro Fujioka, Brian E. O'Rourke, Koji Michishio, Yoshinori Kobayashi, Nagayasu Oshima, Hitoshi Kodamatani, Takuji Shintani, Long D. Nghiem .  Transport of small and neutral solutes through reverse osmosis membranes: Role of skin layer conformation of the polyamide film .  Journal of Membrane Science554   301 - 308   2018.3Reviewed

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    © 2018 Elsevier B.V. The polyamide skin layer of reverse osmosis (RO) membranes was characterised using advanced and complementary analytical techniques to investigate the mechanisms underlying the permeation of contaminants of emerging concern in potable water reuse – N-nitrosodimethylamine (NDMA) and N-nitrosomethylethylamine (NMEA). This study used five RO membrane samples with similar membrane properties. The five RO membrane samples spanned over a large range of water permeance (0.9–5.8 L/m2 h bar) as well as permeation of NDMA (9–66%) and NMEA (3–29%). Despite these differences among the five RO membranes, characterisations of the skin layer using positron annihilation lifetime spectroscopy, atomic force microscopy and field emission scanning electron microscopy revealed almost no variation in their free-volume hole-radius (0.270–0.275 nm), effective surface area (198–212%) and thickness (30–35 nm) of the skin layer. The results suggest that there could be other RO skin layer properties, such as the interconnectivity of the protuberances within the polyamide skin layer additional to the free-volume hole-size and thickness of the skin layer, which can also govern water and solute permeation.

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  • Takahiro Fujioka, Haruka Takeuchi, Hiroaki Tanaka, Hitoshi Kodamatani .  Online monitoring of N-nitrosodimethylamine rejection as a performance indicator of trace organic chemical removal by reverse osmosis .  Chemosphere200   80 - 85   2018.2Reviewed

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    The security of recycled water quality in potable reuse can be enhanced by improving the credibility of reverse osmosis (RO) treatment for the removal of trace organic chemicals (TOrCs). This study evaluated the potential of online monitoring of N-nitrosodimethylamine (NDMA) before and after RO treatment as a surrogate indicator for TOrC removal by RO. This pilot-scale study monitored NDMA concentrations in RO feedwater (ultrafiltration-treated wastewater) and RO permeate every 22 min using novel online NDMA analyzers—high-performance liquid chromatography followed by photochemical reaction and chemiluminescence detection. NDMA rejection by RO varied considerably in response to changes in operating conditions (permeate flux and feedwater temperature). A high linear correlation between NDMA rejection and the rejection of six other TOrCs was observed. The linear correlation was also identified for an RO membrane damaged with chlorine. The correlation between another potential surrogate indicator (conductivity rejection) and TOrC rejection was relatively low. NDMA, which is the smallest compound among regulated TOrCs, revealed rejections lower than the other TOrCs, indicating that NDMA rejection can be a conservative surrogate indicator capable of predicting changes in TOrC removal.

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  • Takahiro Fujioka, Taketo Tanisue, Shannon L. Roback, Megan H. Plumlee, Kenneth P. Ishida, Hitoshi Kodamatani .  Near real-time N-nitrosodimethylamine monitoring in potable water reuse via online high-performance liquid chromatography-photochemical reaction-chemiluminescence .  ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY3 ( 6 ) 1032 - 1036   2017.9Reviewed

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    Direct potable reuse requires stringent water quality assurance to protect public health. This study developed an online analytical technique-high-performance liquid chromatography followed by photochemical reaction and chemiluminescence detection (HPLCPR-CL)-for determination of the concentration of N-nitrosodimethylamine (NDMA) and three other N-nitrosamines. Its feasibility for near real-time analysis was evaluated by analyzing an ultrafiltration (UF)-treated wastewater before and after a pilotscale reverse osmosis (RO) treatment system. The online instrument with a method detection limit of 0.3-2.7 ng L-1 requires a direct injection (i.e., no sample pre-concentration) of only 20-200 mu L sample volume for the determination of N-nitrosamine concentrations every 20 min. NDMA concentrations in UF-treated wastewater were successfully monitored in a range of 50-200 ng L-1 over the course of 24 h. Likewise, NDMA concentrations in RO permeate ranged from 26-81 ng L-1 over the course of 48 h. The online monitor was capable of recording variations in N-nitrosamine concentration in RO permeate that occurred following changes in feedwater concentration and temperature. This study demonstrates the potential for online water quality assurance via direct measurement of trace levels of organic contaminants, which is highly relevant to the implementation of potable reuse.

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  • Ryo Kanzaki, Shuma Uchida, Hitoshi Kodamatani, Takashi Tomiyasu .  Copper(II) Chloro Complex Formation Thermodynamics and Structure in Ionic Liquid, 1-Butyl-3-Methylimidazolium Trifluoromethanesulfonate .  JOURNAL OF PHYSICAL CHEMISTRY B121 ( 41 ) 9659 - 9665   2017.9Reviewed

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    Metal ions in ionic liquids are laid under an unprecedented reaction field. In order to assess the reaction thermodynamics of metal ions in such a situation, Cu2+-chloro complex formation was examined with spectroscopic and calorimetric titrations in an ionic liquid, 1-buthy1-3-methylimidazolium trifluoromethanesulfonate (C(4)mimTfO). In addition, the effect of the structure of the solvated complexes on the complexation mechanism was investigated with the aid of DFT calculations. Chloro complexation successively proceeded and finally provided a [CuCl4](2-) species, which is also the final product in conventional molecular solvents. Their stability constants were comparable to those in molecular solvents. Interestingly, in spite of the charged solvent in the ionic liquid, the entropy profile of the complexation resembled that in the conventional molecular liquids. This indicates that the entropy gain of the released solvent species from the complexes is the main driving force of the chloro complexation in the ionic liquid. In contrast, unlike the major molecular solvents, the total coordination number of Cu2+ is saturated to 4 in the ionic liquid, and the Cl- complexation tends to be accompanied by a 1:1 exchange of the solvent TfO- from the complex. In addition, this ligand exchange was almost athermal. This possibly indicates that the coordination number is dominated by the electrostatic hindrance among the ligands including the solvent ions in the primary coordination sphere.

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  • Moe Ma Ma Tin, George Anioke, Osamu Nakagoe, Shuji Tanabe, Hitoshi Kodamatani, Long D. Nghiem, Takahiro Fujioka .  Membrane fouling, chemical cleaning and separation performance assessment of a chlorine-resistant nanofiltration membrane for water recycling applications .  SEPARATION AND PURIFICATION TECHNOLOGY189   170 - 175   2017.7Reviewed

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    The effectiveness of hypochlorite cleaning for fouling mitigation of a prototype chlorine-resistant nanofiltration (NF) membrane was assessed for direct filtration of a secondary treated effluent. The chlorine resistance and separation performance of the prototype NF membrane were also compared to commercial NF and reverse osmosis membranes. The prototype chlorine resistant NF membrane did not show any changes in permeability and conductivity rejection after exposing a NaOCl solution for up to 5 x 10(4) ppm-h. By contrast, a considerable deterioration in rejection was observed for the other two commercial membranes. Direct filtration of a secondary treated effluent by the prototype NF membrane resulted in a progressive permeability reduction by up to 25% after 10 h of filtration. The membrane permeability was fully restored by hypochlorite cleaning with a 2000 ppm NaOCl solution for 1 h. Effective permeability recovery by hypochlorite cleaning was demonstrated with multiple hypochlorite cleaning cycles. Membrane fouling and hypochlorite cleaning were also simulated using solutions containing a model foulant (sodium alginate, humic acids or bovine serum albumin). Among them, an insufficient permeability recovery was observed for membrane fouling caused by humic acids. Further research is recommended to develop an improved hypochlorite cleaning protocol to control various membrane fouling.

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  • Kohji Marumoto, Akinori Takeuchi, Shoko Imai, Hitoshi Kodamatani, Noriyuki Suzuki .  Mercury evasion fluxes from sea surfaces of the Tsushima Strait and the Kuroshio Current in the East China Sea .  Geochemical Journal   2017.7Mercury evasion fluxes from sea surfaces of the Tsushima Strait and the Kuroshio Current in the East China SeaReviewed

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  • Fujioka Takahiro, Masaki Shunya, Kodamatani Hitoshi, Ikehata Keisuke .  Degradation of N-Nitrosodimethylamine by UV-Based Advanced Oxidation Processes for Potable Reuse: a Short Review .  CURRENT POLLUTION REPORTS3 ( 2 ) 79 - 87   2017.6Reviewed

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  • Takashi Tomiyasu, Hitoshi Kodamatani, Ryusuke Imura, Akito Matsuyama, Junko Miyamoto, Hirokatsu Akagi, David Kocman, Joze Kotnik, Vesna Fajon, Milena Horvat .  The dynamics of mercury near Idrija mercury mine, Slovenia: Horizontal and vertical distributions of total, methyl, and ethyl mercury concentrations in soils .  CHEMOSPHERE184   244 - 251   2017.5Reviewed

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    The distributions of the total mercury (T-Hg), methylmercury (MeHg), and ethylmercury (EtHg) concentrations in soil and their relationship to chemical composition of the soil and total organic carbon content (TOC, %) were investigated. Core samples were collected from hill slope on the right and left riverbanks of the Idrija River. Former smelting plant is located on the right bank. The T-Hg average in each of the core samples ranged from 0.25 to 1650 mg kg(-1) .The vertical T-Hg variations in the samples from the left bank showed no significant change with depth. Conversely, the T-Hg varied with depth, with the surface, or layers several centimeters from the surface, tending to show the highest values in the samples from the right bank. Since the right and left bank soils have different chemical compositions, different pathways of mercury delivery into soils were suggested. The MeHg and EtHg concentrations ranged from n.d. (not detected) to 444 mu g kg(-1) and n.d. to 17.4 mu g kg(-1), respectively. The vertical variations of MeHg and EtHg were similar to those of TOC, except for the near-surface layers containing TOC greater than 20%. These results suggest that the decomposition of organic matter is closely related to organic mercury formation. (C) 2017 Elsevier Ltd. All rights reserved.

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  • Takahiro Fujioka, Hitoshi Kodamatani, Hidenobu Aizawa, Stephen Gray, Kenneth P. Ishida, Long D. Nghiem .  Role of membrane fouling substances on the rejection of N-nitrosamines by reverse osmosis .  WATER RESEARCH118   187 - 195   2017.3Reviewed

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    The impact of fouling substances on the rejection of four N-nitrosamines by a reverse osmosis (RO) membrane was evaluated by characterizing individual organic fractions in a secondary wastewater effluent and deploying a novel high-performance liquid chromatography-photochemical reaction-chemiluminescence (HPLC-PR-CL) analytical technique. The HPLC-PR-CL analytical technique allowed for a systematic examination of the correlation between the fouling level and the permeation of N-nitro. samines in the secondary wastewater effluent and synthetic wastewaters through an RO membrane. Membrane fouling caused by the secondary wastewater effluent led to a notable decrease in the permeation of N-nitrosodimethylamine (NDMA) while a smaller but nevertheless discernible decrease in the permeation of N-nitrosomethylethylamine (NMEA), N-nitrosopyrrolidine (NPYR) and N-nitrosomorpholine (NMOR) was also observed. Fluorescence spectrometry analysis revealed that major foulants in the secondary wastewater effluent were humic and fulvic acid-like substances. Analysis using the size exclusion chromatography technique also identified polysaccharides and proteins as additional fouling substances. Thus, further examination was conducted using solutions containing model foulants (i.e., sodium alginate, bovine serum albumin, humic acid and two fulvic acids). Similar to the secondary wastewater effluent, membrane fouling with fulvic acid solutions resulted in a decrease in N-nitrosamine permeation. In contrast, membrane fouling with the other model foulants resulted in a negligible impact on N-nitrosamine permeation. Overall, these results suggest that the impact of fouling on the permeation of N-nitrosamines by RO is governed by specific small organic fractions (e.g. fulvic acid-like organics) in the secondary wastewater effluent. (C) 2017 Elsevier Ltd. All rights reserved.

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  • Hitoshi Kodamatani, Chihiro Maeda, Steven J. Balogh, Yabing H. Nollet, Ryo Kanzaki, Takashi Tomiyasu .  The influence of sample drying and storage conditions on methylmercury determination in soils and sediments .  CHEMOSPHERE173   380 - 386   2017.3Reviewed

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    The separate influences of drying and storage conditions on methylmercury (MeHg) concentrations in soil and sediment samples were investigated. Concentrations of MeHg and total Hg were determined in various soil and sediment samples that had been stored or dried under differing conditions. The influence of drying conditions (oven-drying (40 degrees C) versus freeze-drying) on MeHg concentrations in marine sediments, river sediments, soils, and paddy field soils was investigated (n = 43). The ratio of the MeHg concentration in oven-dried sub-samples divided by the concentration in freeze-dried sub-samples ranged from 0 to 336%. In order to confirm the production of MeHg during storage in some samples, Hg2+ was added at 15 mg kg(-1) to a paddy soil, and the sample was then stored at 30 degrees C. The concentrations of MeHg at 1-h, 1-day, 4-days and 7-days after Hg2+ spiking were 2.0 +/- 0.1, 13.8 +/- 1.0, 36.0 +/- 5.0, and 24.9 +/- 1.6 mu g kg(-1) (n = 3), respectively. The concentration of MeHg at 4-days after Hg spiking and sterilizing (121 degrees C, 30 min) was 1.8 mu g kg(-1), similar to the original value. These results indicate that bacterial Hg methylation and MeHg demethylation occurred within days in the soil. In addition, tests of the stability of MeHg in wet and dry samples during storage were also performed. Overall, our results indicate that the best way to preserve MeHg in soil and sediment samples is to freeze the samples immediately after collection, followed subsequently by freeze-drying, grinding, homogenization, and storage of the dry material in cool, dark conditions until analysis.

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  • Hitoshi Kodamatani, Steven J. Balogh, Yabing H. Nollet, Akito Matsuyama, Vesna Fajon, Milena Horvat, Takashi Tomiyasu .  An inter-laboratory comparison of different analytical methods for the determination of monomethylmercury in various soil and sediment samples: A platform for method improvemen .  CHEMOSPHERE169   32 - 39   2016.11Reviewed

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    An inter-laboratory study was conducted to compare results from different analytical methods for monomethylmercury (MeHg) concentrations in 17 soil and sediment samples. The samples were collected from mercury-contaminated areas, including Minamata Bay and Kagoshima Bay in Japan, the Idrija mercury mine in Slovenia, and an artisanal small-scale gold mining area in Indonesia. The Hg in these samples comes from several different sources: industrial waste from an acetaldehyde production facility, volcanic activity, Hg mining activity, and artisanal and small-scale gold mining activity (ASGM). MeHg concentrations in all the samples were measured in four separate laboratories, using three different determination methods: Kagoshima University (Japan), using high-performance liquid chromatography chemiluminescence detection (HPLC-CL); National Institute for Minamata Disease (Japan), using gas chromatography electron capture detection; and Metropolitan Council Environmental Services (USA) and Jozef Stefan Institute (Slovenia), both using alkylation-gas chromatography atomic fluorescence spectrometry detection. The methods gave comparable MeHg results for most of the samples tested, but for some samples, the results exhibited significant variability depending on the method used. The HPLC-CL method performed poorly when applied to samples with elevated sulfur concentrations, producing MeHg concentrations that were much lower than those from the other methods. Additional analytical work demonstrated the elimination of this sulfur interference when the method was modified to bind sulfur prior to the analytical step by using Hg2+ as a masking agent. These results demonstrate the value of laboratory intercomparison exercises in contributing to the improvement of analytical methods. (C) 2016 Elsevier Ltd. All rights reserved.

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  • Takashi Tomiyasu, Hitoshi Kodamatani, Yuriko Kono Hamada, Akito Matsuyama, Ryusuke Imura, Yoko Taniguchi, Nuril Hidayati, Joeni Setijo Rahajoe .  Distribution of total mercury and methylmercury around the small-scale gold mining area along the Cikaniki River, Bogor, Indonesia .  ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH24 ( 3 ) 2643 - 2652   2016.11Reviewed

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    This study investigates the distribution of total mercury (T-Hg) and methylmercury (MeHg) in the soil and water around the artisanal and small-scale gold mining (ASGM) area along the Cikaniki River, West Java, Indonesia. The concentration of T-Hg and MeHg in the forest soil ranged from 0.07 to 16.7 mg kg(-1) and from &lt; 0.07 to 2.0 mu g kg(-1), respectively, whereas it ranged from 0.40 to 24.9 mg kg(-1) and from &lt; 0.07 to 56.3 mu g kg(-1), respectively, in the paddy field soil. In the vertical variation of the T-Hg of forest soil, the highest values were observed at the soil surface, and these values were found to decrease with increasing depth. A similar variation was observed for MeHg and total organic carbon content (TOC), and a linear relationship was observed between them. Mercury deposited on the soil surface can be trapped and retained by organic matter and subjected to methylation. The slope of the line obtained for the T-Hg vs. TOC plot became larger near the ASGM villages, implying a higher rate of mercury deposition in these areas. In contrast, the plots of MeHg vs. TOC fell along the same trend line regardless of the distance from the ASGM village. Organic carbon content may be a predominant factor in controlling MeHg formation in forest soils. The T-Hg concentration in the river water ranged from 0.40 to 9.6 mu g L-1. River water used for irrigation can prove to be a source of mercury for the paddy fields. The concentrations of Hg-0 and Hg2+ in river water showed similar variations as that observed for the T-Hg concentration. The highest Hg-0 concentration of 3.2 mu g L-1 can be attributed to the waste inflow from work sites. The presence of Hg-0 in river water can become a source of mercury present in the atmosphere along the river. MeHg concentration in the river water was found to be 0.004-0.14% of T-Hg concentration, which was considerably lower than the concentrations of other Hg species. However, MeHg comprised approximately 0.2% of the T-Hg in paddy field soil. Mercury deposited from the atmosphere and the river water can be subjected to methylation. Paddy fields are very important ecosystems; therefore, the effect of MeHg on these ecosystems and human beings should be further investigated.

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  • Hitoshi Kodamatani, Yoshimi Iwaya, Makoto Saga, Keiitsu Saito, Takahiro Fujioka, Shigeo Yamazaki, Ryo Kanzaki, Takashi Tomiyasu .  Ultra-sensitive HPLC-photochemical reaction-luminol chemiluminescence method for the measurement of secondary amines after nitrosation .  ANALYTICA CHIMICA ACTA952   50 - 58   2016.11Reviewed

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    A novel method for the determination of secondary amines at the nanomolar level was developed. The method is based on the nitrosation reaction of secondary amines, with the generated N-nitrosamines being measured using an HPLC separation, photochemical reaction, and chemiluminescence detection system. The efficient nitrosation of secondary amines was performed using sodium nitrite (200 mM) and acetic acid (0.8 M) at 80 degrees C over 60 min. Although compounds bearing OH and SH functional groups also underwent the nitrosation reaction, the sensitivity of these compounds was 1000 times lower than that of the secondary amines. Our method was applied to the determination of low molecular weight secondary amines, including dimethylamine, morpholine, pyrrolidine, diethylamine, and piperidine, giving method detection limits of 0.7 nM, 0.2 nM, 0.4 nM, 0.7 nM, and 1.5 nM, respectively. The calibration curves were linear in the range of 5-100 nM. We then applied this method for the detection and quantification of these secondary amines in samples of tap water, river water, treated wastewater, and sea water. Dimethylamine was detected at concentrations up to 15.4 nM, &lt;0.7 nM, and 48.5 nM in tap water, river water, and treated wastewater samples, respectively, with recoveries ranging from 94 to 103%. Other amines were also detected at nanomolar levels. These results indicate that our proposed method can be applied to the analysis of secondary amines in various environmental water samples. To the best of our knowledge, the proposed method is one of the most sensitive and selective methods for the determination of secondary amines without pre-concentration steps. (C) 2016 Elsevier B.V. All rights reserved.

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  • Hitoshi Kodamatani, Hitomi Yamasaki, Takeru Sakaguchi, Shinya Ito, Yoshimi Iwaya, Keiitsu Saito, Ryo Kanzaki, Takashi Tomiyasu .  Rapid method for monitoring of N-nitorosodimethylamine (NDMA) in drinking water at ng/L level without pre-concentration .  Journal of Chromatography A1460   202 - 206   2016Rapid method for monitoring of N-nitorosodimethylamine (NDMA) in drinking water at ng/L level without pre-concentrationReviewed

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  • Takahiro Fujioka, Haruka Takeuchi, Hiroaki Tanaka, Long D. Nghiem, Kenneth P. Ishida, Hitoshi Kodamatani .  A rapid and reliable technique for N-nitrosodimethylamine analysis in reclaimed water by HPLC-photochemical reaction-chemiluminescence .  Chemosphere161   104 - 111   2016A rapid and reliable technique for N-nitrosodimethylamine analysis in reclaimed water by HPLC-photochemical reaction-chemiluminescenceReviewed

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.chemosphere.2016.06.094

  • Ryo Kanzaki, Hitoshi Kodamatani, Takashi Tomiyasu, Hikari Watanabe, Yasuhiro Umebayashi .  A pH scale in Protic Ionic Liquid Ethylammonium Nitrate .  Angewandte Chemie International Edition55   6266 - 6269   2016A pH scale in Protic Ionic Liquid Ethylammonium NitrateReviewed

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    DOI: 10.1002/anie.201511328

  • Influence of submarine fumaroles on the seasonal changes in mercury species in the waters of Kagoshima Bay, Japan .  Influence of submarine fumaroles on the seasonal changes in mercury species in the waters of Kagoshima Bay, Japan .  Marine Chemistry177   763 - 771   2015Influence of submarine fumaroles on the seasonal changes in mercury species in the waters of Kagoshima Bay, JapanReviewed

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    DOI: 10.1016/j.marchem.2015.10.009

  • Masahiro Yamamoto, Hitoshi Kodamatani, Yuriko Kono, Akinori Takeuchi, Ken Takai, Takashi Tomiyasu, Katsumi Marumo .  Development of a deep sea mercury sensor using in situ anodic stripping voltammetry .  Geochemical Journal49   613 - 620   2015Development of a deep sea mercury sensor using in situ anodic stripping voltammetryReviewed

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    DOI: 10.2343/geochemj.2.0368

  • Takashi Tomiyasu, Shinya Takenaka, Yukiko Noguchi, Hitoshi Kodamatani, Akito Matsuyama, Kimihiko Oki, Yuriko Kono, Ryo Kanzaki, Hirokatsu Akagi .  Estimation of the residual total mercury in marine sediments of Minamata Bay after a pollution prevention project .  Marine Chemistry159   19 - 24   2014.2Estimation of the residual total mercury in marine sediments of Minamata Bay after a pollution prevention projectReviewed

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    DOI: 10.1016/j.marchem.2013.12.002

  • Naoya Kishikawa, Naoko Kondo, Abena Amponsaa-Karikari, Hitoshi Kodamatani, Kaname Ohyama, Kenichiro Nakashima, Shigeo Yamazaki, Naotaka Kuroda .  Rapid determination of isoamyl nitrite in pharmaceutical preparations by flow injection analysis with on-line UV irradiation and luminol chemiluminescence detection .  Luminescence29   8 - 12   2014.1Rapid determination of isoamyl nitrite in pharmaceutical preparations by flow injection analysis with on-line UV irradiation and luminol chemiluminescence detectionReviewed

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    DOI: 10.1002/bio.2466

  • 児玉谷 仁 .  ルテニウム錯体化学発光反応におけるコリアクタント分子構造の最適化および環境・生体・食品中微量物質の分析 .  分析化学62 ( 10 ) 891 - 901   2013.10ルテニウム錯体化学発光反応におけるコリアクタント分子構造の最適化および環境・生体・食品中微量物質の分析Reviewed

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    DOI: 10.2116/bunsekikagaku.62.891

  • Takashi Tomiyasu, Yuriko Kono, Hitoshi Kodamatani, Nuril Hidayati, Joeni S Rahajoe .  The distribution of mercury around the small-scale gold mining area along the Cikaniki River, Bogor, Indonesia .  Environmental Research125   12 - 19   2013.8The distribution of mercury around the small-scale gold mining area along the Cikaniki River, Bogor, IndonesiaReviewed

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    DOI: 10.1016/j.envres.2013.03.015

  • Hitoshi Kodamatani, Takashi Tomiyasu .  Selective determination method for measurement of methylmercury and ethylmercury in soil/sediment samples using high-performance liquid chromatography-chemiluminescence detection coupled with simple extraction technique .  Journal of Chromatography A1228   155 - 159   2013.4Selective determination method for measurement of methylmercury and ethylmercury in soil/sediment samples using high-performance liquid chromatography-chemiluminescence detection coupled with simple extraction techniqueReviewed

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    DOI: 10.1016/j.chroma.2013.02.004

  • Hitoshi Kodamatani, Akito Matsuyama, Keiitsu Saito, Yuriko Kono, Ryo Kanzaki, Takashi Tomiyasu .  Sensitive determination method for mercury ion, methyl-, ethyl-, and phenyl-mercury in water and biological samples using high-performance liquid chromatography with chemiluminescence detection .  Analytical Sciences28 ( 10 ) 959 - 965   2012.10Sensitive determination method for mercury ion, methyl-, ethyl-, and phenyl-mercury in water and biological samples using high-performance liquid chromatography with chemiluminescence detectionReviewed

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    DOI: 10.2116/analsci.28.959

  • Takashi Tomiyasu, Akito Matsuyama, Ryusuke Imura, Hitoshi Kodamatani, Junko Miyamoto, Yuriko Kono, David Kocman, Joze Kotnik, Vesna Fajon, Milena Horvat .  The distribution of Total and methylmercury concentrations in soils near the Idrija mercury mine, Slovenia, and the dependence of the mercury concentrations on the chemical composition and organic carbon levels of the soil .  Environmental Earth Sciences65 ( 4 ) 1309 - 1322   2012.2The distribution of Total and methylmercury concentrations in soils near the Idrija mercury mine, Slovenia, and the dependence of the mercury concentrations on the chemical composition and organic carbon levels of the soilReviewed

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    DOI: 10.1007/s12665-011-1379-z

  • 冨安 卓滋,廣瀬 公人,児玉谷 仁,穴澤 活郎,神崎 亮,河野 百合子,志賀 美英 .  中国雲南省个旧市錫鉱山周辺土壌における総ヒ素濃度分布 .  分析化学61 ( 1 ) 21 - 29   2012.1中国雲南省个旧市錫鉱山周辺土壌における総ヒ素濃度分布Reviewed

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    DOI: 10.2116/bunsekikagaku.61.21

  • Yuriko Kono, Joeni S. Rahajoe, Nuril Hidayati, Hitoshi Kodamatani, Takashi Tomiyasu .  Using native epiphytic ferns to estimate the atmospheric mercury levels in a small-scale gold mining area of West Java, Indonesia .  Chemosphere89 ( 3 ) 241 - 248   2012.1Using native epiphytic ferns to estimate the atmospheric mercury levels in a small-scale gold mining area of West Java, IndonesiaReviewed

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    DOI: 10.1016/j.chemosphere.2012.04.027

  • Hitoshi Kodamatani, Ryo Kanzaki, Takashi Tomiyasu, Keiitsu Saito, Yuriko Kono .  Determination of organic and inorganic mercury species as emetine dithiocarbamate complexes by high-performance liquid chromatography with electrogenerated tris(2,2’-bipyridine)ruthenium(III) chemiluminescence detection .  Analytical Letters44   2769 - 2779   2011.12Determination of organic and inorganic mercury species as emetine dithiocarbamate complexes by high-performance liquid chromatography with electrogenerated tris(2,2’-bipyridine)ruthenium(III) chemiluminescence detectionReviewed

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    DOI: 10.1080/00032719.2011.565442

  • Hitoshi Kodamatani, Shigeo Yamazaki, Keiitsu Saito, Yu Komatsu, Takashi Tomiyasu .  Rapid Method for Simultaneous Determination of Nitrite and Nitrate inWater Samples Using Short-Column Ion-Pair Chromatographic Separation, Photochemical Reaction, and Chemiluminescence Detection .  Analytical Sciences27   187 - 192   2011.2Rapid Method for Simultaneous Determination of Nitrite and Nitrate inWater Samples Using Short-Column Ion-Pair Chromatographic Separation, Photochemical Reaction, and Chemiluminescence DetectionReviewed

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    DOI: 10.2116/analsci.27.187

  • 河田裕介,児玉谷仁,山崎重雄,齊藤惠逸 .  ルミノールの化学発光反応におけるCo(III)錯体の触媒作用 .  分析化学59 ( 8 ) 665 - 671   2010.8ルミノールの化学発光反応におけるCo(III)錯体の触媒作用Reviewed

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    DOI: 10.2116/bunsekikagaku.59.665

  • 太田奈奈美,児玉谷仁,山崎重雄,藤永薫,小松優,齊藤惠逸 .  イオン対抽出を用いるリン酸イオンの間接化学発光検出 .  分析化学58 ( 6 ) 539 - 544   2009.6イオン対抽出を用いるリン酸イオンの間接化学発光検出Reviewed

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    DOI: 10.2116/bunsekikagaku.58.539

  • Hitoshi Kodamatani, Shigeo Yamazaki, Keiitsu Saito, Takashi Tomiyasu, Yu Komatsu .  Selective determination of nitrite and nitrate in water samples by ion chromatography with post-column photochemical reaction and luminol chemiluminescence detection .  Journal of Chromatography A1216   3163 - 3167   2009.4Selective determination of nitrite and nitrate in water samples by ion chromatography with post-column photochemical reaction and luminol chemiluminescence detectionReviewed

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    DOI: 10.1016/j.chroma.2009.01.096

  • Hitoshi Kodamatani, Yu Komatsu, Shigeo Yamazaki, Keiitsu Saito .  Effect of carboxyl group on the chemiluminescent reaction of electrogenerated tris(2,2’-bipyridine)ruthenium(III) with aliphatic amines .  Talanta78   227 - 232   2009.4Effect of carboxyl group on the chemiluminescent reaction of electrogenerated tris(2,2’-bipyridine)ruthenium(III) with aliphatic aminesReviewed

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    DOI: 10.1016/j.talanta.2008.11.001

  • Hitoshi Kodamatani, Shigeo Yamazaki, Keiitsu Saito, Abena Amponsaa-Karikari, Naoya Kishikawa, Naotaka Kuroda, Takashi Tomiyasu, Yu Komatsu .  Highly sensitive method for determination of N-nitrosamines using high-performance liquid chromatography with online UV irradiation and luminol chemiluminescence detection .  Journal of Chromatography A1216   92 - 98   2009.1Highly sensitive method for determination of N-nitrosamines using high-performance liquid chromatography with online UV irradiation and luminol chemiluminescence detectionReviewed

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    DOI: 10.1016/j.chroma.2008.11.025

  • Hitoshi Kodamatani, Yu Komatsu, Shigeo Yamazaki, Keiitsu Saito .  Electrogenerated chemiluminescence reaction of tris(2,2'-bipyridine)ruthenium(II)with 2,5-dimethylthiophene as co-reagent in aqueous solution .  Analytica Chimica Acta622   119 - 125   2008.8Electrogenerated chemiluminescence reaction of tris(2,2'-bipyridine)ruthenium(II)with 2,5-dimethylthiophene as co-reagent in aqueous solutionReviewed

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    DOI: 10.1016/j.aca.2008.05.050

  • Hitoshi Kodamatani, Yu Komatsu, Shigeo Yamazaki, Keiitsu Saito .  Novel derivatization reagent, (2,4,5-trimethylthiophene-3-yl)acetic acid, for electrogenerated tris(2,2’-bipyridine)ruthenium(III) chemiluminescence detection .  Chemistry Letters37   80 - 81   2008.1Novel derivatization reagent, (2,4,5-trimethylthiophene-3-yl)acetic acid, for electrogenerated tris(2,2’-bipyridine)ruthenium(III) chemiluminescence detectionReviewed

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    DOI: 10.1246/cl.2008.80

  • Junji Noro, Shigekazu Turubou, Yuichi Michiue, Hitoshi Kodamatani, Yujiro Watanabe, Kaoru Fujinaga, Yu Komatsu .  Tow-Stage Ion-Exchange Separation-Method for the Separation of Strontium from other alkaline earth metal ions .  Journal of Ion Exchange18   434 - 439   2007.10Tow-Stage Ion-Exchange Separation-Method for the Separation of Strontium from other alkaline earth metal ionsReviewed

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    DOI: 10.5182/jaie.18.434

  • Hitoshi Kodamatani, Yu Komatsu, Shigeo Yamazaki, Keiitsu Saito .  Chemiluminescence detection of five-membered heteroaromatic compounds using electrogenerated tris(2,2’-bipyridine)ruthenium(III) .  Analytical Sciences23   407 - 411   2007.4Chemiluminescence detection of five-membered heteroaromatic compounds using electrogenerated tris(2,2’-bipyridine)ruthenium(III)Reviewed

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    DOI: 10.2116/analsci.23.407

  • Hitoshi Kodamatani, Yu Komatsu, Shigeo Yamazaki, Keiitsu Saito .  Highly sensitive and simple method for measurement of pipecolic acid using reverse-phase ion-pair high performance liquid chromatography with tris(2,2’-bipyridine)ruthenium(III) chemiluminescence detection .  Journal of Chromatography A1140   88 - 94   2007.1Highly sensitive and simple method for measurement of pipecolic acid using reverse-phase ion-pair high performance liquid chromatography with tris(2,2’-bipyridine)ruthenium(III) chemiluminescence detectionReviewed

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.chroma.2006.11.059

  • Hitoshi Kodamatani, Hisashi Shimizu, Keiitsu Saito, Shigeo Yamazaki, Youichi Tanaka .  High-performance liquid chromatography of aromatic compounds with photochemical decomposition and tris(2,2’-bipyridine)ruthenium(III) chemiluminescence detection .  Journal of Chromatography A1102   200 - 205   2006.1High-performance liquid chromatography of aromatic compounds with photochemical decomposition and tris(2,2’-bipyridine)ruthenium(III) chemiluminescence detectionReviewed

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    DOI: 10.1016/j.chroma.2005.10.059

  • Hitoshi Kodamatani, Keiitsu Saito, Nobumitsu Niina, Shigeo Yamazaki, Youichi Tanaka .  Simple and sensitive method for determination of glycoalkaloids in potato tubers by high-performance liquid chromatography with chemiluminescence detection .  Journal of Chromatography A1100   26 - 31   2005.12Simple and sensitive method for determination of glycoalkaloids in potato tubers by high-performance liquid chromatography with chemiluminescence detectionReviewed

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    DOI: 10.1016/j.chroma.2005.09.006

  • Nobumutsu Niina, Hitoshi Kodamatani, Kayoko Uozumi, Yuki Kokufu, Keiitsu Saito, Sigeo Yamazaki .  Detection of Monoethanolamine, Diethanolamine, and Triethanolamine by HPLC with Chemilluminescence Reaction and Online Derivatization to Tertiary Amine .  Analtical Sciences21   497 - 500   2005.5Detection of Monoethanolamine, Diethanolamine, and Triethanolamine by HPLC with Chemilluminescence Reaction and Online Derivatization to Tertiary AmineReviewed

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    DOI: 10.2116/analsci.21.497

  • Hitoshi Kodamatani, Keiitsu Saito, Akihiko Muromatsu, Nobumitsu Niina, Shigeo Yamazaki .  New chemiluminecscece detection method of aliphatic conjugated dienes with electrogenerated tris(2,2'-bipyridine)ruthenium(III) .  Analytical Letters38   291 - 301   2005.1New chemiluminecscece detection method of aliphatic conjugated dienes with electrogenerated tris(2,2'-bipyridine)ruthenium(III)Reviewed

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    DOI: 10.1081/AL-200045155

  • Hitoshi Kodamatani, Keiitsu Saito, Nobumitsu Niina, Shigeo Yamazaki, Akihiko Muromatsu, Ikuo Sakurada .  Sensitive determination of domoic acid using high performance liquid chromatography with electrogenerated tris(2,2'-bipyridine)ruthenium(III) chemiluminescence detection .  Analytical Sciences20   1065 - 1068   2004.7Sensitive determination of domoic acid using high performance liquid chromatography with electrogenerated tris(2,2'-bipyridine)ruthenium(III) chemiluminescence detectionReviewed

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    DOI: 10.2116/analsci.20.1065

  • 新名伸光, 児玉谷仁, 齊藤惠逸, 山崎重雄 .  トリス(2,2'-ビピリジル)ルテニウム錯イオンの化学発光を利用したチウラムとその類似物質の検出 .  分析化学52   763 - 767   2003.9トリス(2,2'-ビピリジル)ルテニウム錯イオンの化学発光を利用したチウラムとその類似物質の検出Reviewed

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    DOI: 10.2116/bunsekikagaku.52.763

  • Hitoshi Kodamatani, Keiitsu Saito, Nobumitsu Niina, Shigeo Yamazaki .  Determination of Amitrole with Chemiluminescent Reaction Using Electrogenerated Tris(2,2'-bipyridine)ruthenium(III) .  Journal of Ion Exchange14   229 - 232   2003.8Determination of Amitrole with Chemiluminescent Reaction Using Electrogenerated Tris(2,2'-bipyridine)ruthenium(III)Reviewed

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    DOI: 10.5182/jaie.14.Supplement_229

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Books

  • 水銀に関する水俣条約と最新対策・技術,第8章, 監修: 高岡昌輝

    冨安卓滋,児玉谷仁( Role: Joint author)

    シーエムシー出版  2014.11 

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    Language:Japanese Book type:Scholarly book

MISC

  • Erratum: Validation of a novel direct-injection chemiluminescence-based method for N-nitrosamine analysis in advanced-Treated recycled water, drinking water, and wastewater (Environ. Sci.: Water Res. Technol. (2020) 6 (1106–1115) DOI: 10.1039/C9EW00943D)

    Roback S.L., Kodamatani H., Fujioka T., Plumlee M.H.

    Environmental Science: Water Research and Technology   8 ( 3 )   2022.2

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    Language:Japanese   Publisher:Environmental Science: Water Research and Technology  

    The authors regret the omission of one of Shannon L. Roback's affiliations from the original manuscript. The corrected list of authors and affiliations for this paper is as shown here. The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

    DOI: 10.1039/d2ew90004a

    Scopus

  • 化学発光を利用した有機水銀分析法の開発

    児玉谷 仁,冨安 卓滋

    ケミカル エンジニアリング   64 ( 1 )   63 - 70   2019.1

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:化学工業社  

  • 化学発光検出法を利用した有機水銀分析法の開発

    児玉谷 仁, 冨安 卓滋

    ケミカルエンジニヤリング = Chemical engineering   64 ( 1 )   63 - 70   2019.1

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    Language:Japanese   Publisher:化学工業社  

  • Development of the Personal exposure monitoring system for mercury work environment in Artificial Small-scale and Gold Mining

    野田 和俊, 愛澤 秀信, 丸本 幸治, 丸本 倍美, 冨安 卓滋, 児玉谷 仁, 駒井 武, 中村 謙吾

    「センサ・マイクロマシンと応用システム」シンポジウム論文集 電気学会センサ・マイクロマシン部門 [編]   34   2017.10

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    Language:Japanese   Publisher:Institute of Electrical Engineers of Japan  

  • Degradation of N-nitrosodimethylamine by UV-based advanced oxidation processes –a short review- Reviewed

    Takahiro Fujioka, Shunya Masaki, Hitoshi Kodamatani, Keisuke Ikehata

    Current Pollution Reports   2017.3

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:springer  

    DOI: 10.1007/s40726-017-0052-x

  • 微量化学物質を光らせて測る

    児玉谷仁,冨安卓滋

    クリーンテクノロジー・日刊工業出版   9   11 - 16   2013.9

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Presentations

  • 木下陽仁, 中村謙吾, 駒井武, 児玉谷仁, 冨安卓滋, 丸本幸治, 愛澤秀信, 野田和俊   小規模金採掘における多媒体間の物質移動を考慮した水銀の暴露評価  

    第 29 回環境地質学シンポジウム  社会地質学会

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    Event date: 2019.11

    Language:Japanese  

    Venue:東京  

    国内学会

  • 野田和俊, 愛澤秀信, 丸本幸治, 冨安卓滋, 駒井武, 丸本倍美, 児玉谷仁, 中村謙吾   水晶振動子を利用した個人ばく露用高感度ロガーの検知特性  

    第36回「センサ・マイクロマシンと応用システム」シンポジウム  電気学会 センサ・マイクロマシン部門

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    Event date: 2019.11

    Language:Japanese  

    Venue:静岡  

    国内学会

  • 北川俊輝, 河西大悟, 下内 良平, 児玉谷仁, 神﨑亮, 冨安卓滋   水俣湾周辺底質中残留水銀濃度分布と底質化学組成  

    日本地球化学会第66回年会  日本地球化学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京  

    国内会議

  • 野添千裕, 児玉谷仁, 神﨑亮, 冨安卓滋   鹿児島湾海底質中水銀及びセレン濃度分布と海底熱水噴気活動の影響  

    日本地球化学会第66回年会  日本地球化学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

    国内会議

  • 酒匂美夏, 児玉谷仁, 冨安卓滋, 神﨑亮   トリフロメタンスルホン酸塩イオン液体の酸塩基性及びそのポリアクリル酸被覆ナノ粒子の分散のpH応答への影響  

    日本分析化学会第68年会  日本分析化学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉  

    国内会議

  • KODAMATANI Hitoshi, HAMASUNA Shintaro, HONDA Kana, YOKOTA Takahisa, ICHITANI Katsuyuki, KANZAKI Ryo, TOMIYASU Takashi   BEHAVIOR OF MEHG PRODUCTION IN A HG(II) ION SPIKED PADDY FIELD SOIL DURING MULTI-YEAR RICE CULTIVATION AND THE MECHANISM OF MEHG ACCUMULATION IN RICE GRAIN   International conference

    14th International Conference on Mercury as a Global Pollutant  14th International Conference on Mercury as a Global Pollutant

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

    Venue:Krakow, Poland  

    国際会議

  • TOMIYASU Takashi, KODAMATANI Hitoshi, ANDRIO David, NODA Kazutoshi   THE DISTRIBUTION OF MERCURY DISCHARGED BY ASGM ACTIVITY ALONG THE RIAU RIVER, RIAU , SUMATRA, INDONESIA   International conference

    14th International Conference on Mercury as a Global Pollutant  14th International Conference on Mercury as a Global Pollutant

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

    Venue:Krakow, Poland  

    国際学会

  • YASU MATSU Sora, KODAMATANI Hitoshi, KANZAKI Ryo, TAKENAKA Chisato, MURAO Satoshi, MIYAGAWA Shuichi, NONAKA Kenichi, IKEGUCHI Akiko, A. NAVARRETE Ian, TOMIYASU Takashi   THE DYNA MICS OF MERCURY AROUND THE ARTISANAL AND SMALL-SCALE GOLD MINING AREA, CAMARINES NORTE, PHILIPPINES   International conference

    14th International Conference on Mercury as a Global Pollutant  14th International Conference on Mercury as a Global Pollutant

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

    Venue:Krakow, Poland  

    国際学会

  • 野添千裕, 児玉谷仁, 神崎亮, 冨安卓滋   鹿児島湾産魚類に含まれるセレン及び水銀と海底熱水噴気活動による影響  

    第79回分析化学討論会  日本分析化学会

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

    国内会議

  • 久保翔太郎, 児玉谷仁, 神崎亮, 冨安卓滋   222 nm光源による光化学反応を用いた硝酸・亜硝酸イオンの高感度分析法開発  

    第79回分析化学討論会  日本分析化学会

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    Event date: 2019.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:福岡  

    国内会議

  • 久保翔太郎,児玉谷仁,神崎亮,冨安卓滋   222 nm光源による硝酸・亜硝酸イオンの光化学反応  

    日本分析化学会第67年会  日本分析化学会

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    Event date: 2018.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:宮城  

    国内学会

  • 酒匂美夏,児玉谷仁,神崎亮,冨安卓滋   イオン液体中におけるポリアクリル酸被覆ナノ粒子の凝集-再分散のpH応答  

    日本分析化学会第67年会  日本分析化学会

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    Event date: 2018.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:宮城  

    国内学会

  • 谷末武人,児玉谷仁,藤岡貴浩,神崎亮,冨安卓滋   水処理過程におけるN-ニトロソアミン類生成機構の検討  

    日本分析化学会第67年会  日本分析化学会

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    Event date: 2018.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:宮城  

    国内学会

  • 児玉谷仁   化学発光反応を利用したメチル水銀分析法の開発と環境試料への応用   Invited

    103回プラズマ分光分析研究会  プラズマ分光分析研究会

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:千葉  

    国内学会

  • 安松空良, 児玉谷仁, 神崎亮, 竹中千里, 冨安卓滋   フィリピン,カマリネスノルテ州小規模金精錬地域における水銀動態  

    第55回化学関連支部合同九州大会  化学関連支部

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    Event date: 2018.6

    Language:Japanese   Presentation type:Poster presentation  

    Venue:福岡  

    国内学会

  • 安松空良,児玉谷仁,神崎亮,竹中千里,冨安卓滋   フィリピン,カマリネスノルテ州小規模金精錬地域及びその周辺における水銀分布  

    第78回分析化学討論会  日本分析化学会

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    Event date: 2018.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口  

    国内学会

  • 谷末武人,児玉谷仁,藤岡貴浩,神崎亮,冨安卓滋   HPLC-ルミノール化学発光検出を利用したN-ニトロソアミン類生成反応の検討  

    第78回分析化学討論会  日本分析化学会

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    Event date: 2018.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口  

    国内学会

  • 久保翔太郎,児玉谷仁,神崎亮,冨安卓滋   光化学反応とルミノール化学発光を利用した硝酸・亜硝酸の高感度分析法の開発  

    第78回分析化学討論会  日本分析化学会

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    Event date: 2018.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口  

    国内学会

  • 野添千裕,児玉谷仁,神崎亮,冨安卓滋   水素化物発生原子吸光光度法による生体試料中Seの定量  

    第78回分析化学討論会  日本分析化学会

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    Event date: 2018.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:山口  

    国内学会

  • 北村有迅,山口飛鳥,亀田純,冨安卓滋,児玉谷仁,清家弘治,川端訓代,濱田洋平   姶良カルデラ周辺の温泉と地質構造の関係  

    日本地球惑星科学連合2018年大会  日本地球化学会

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    Event date: 2018.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉  

    国内学会

  • 川端訓代,森川徳敏,風早康平,高橋浩,高橋正明,児玉谷仁,鹿野和彦,北村有迅,冨安卓滋   八代海における海底地すべり調査計画  

    日本地球惑星科学連合2018年大会  日本地球化学会

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    Event date: 2018.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉  

    国内学会

  • 児玉谷仁   水銀汚染土壌からのメチル水銀生成と稲(コメ)への蓄積   Invited

    平成29年度メチル水銀ミーティング  環境省

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    Event date: 2017.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

    国内学会

  • 野田 和俊,愛澤 秀信,丸本 幸治,丸本 倍美,冨安 卓滋,児玉谷 仁,駒井 武,中村 謙吾   小規模金採掘地域での水銀使用作業環境個人ばく露測定システムの開発  

    第34回センサ・マイクロマシンと応用システム 

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    Event date: 2017.10 - 2017.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

  • 野田 和俊,愛澤 秀信,丸本 幸治,丸本 倍美,冨安 卓滋,児玉谷 仁,駒井 武,中村 謙吾   水晶振動子を利用した水銀作業環境個人ばく露測定システムの検知特性センサー  

    資源・素材&EARTH 2017 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

  • Mineshi Sakamoto, Takaaki Itai, Koji Marumoto, Keisuke Mori, Mlena Horvat, Alexandre Poulain, Hitoshi Kodamatani, Takashi Tomiyasu   Mercury speciation in preserved sludge which is estimated to be remaining under the reclaimed land area of Minamata Bay Japan   International conference

    Eurotox 2017 

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    Event date: 2017.9

    Language:English   Presentation type:Poster presentation  

    Venue:Bratislava, Slovak  

  • 神崎 亮,児玉谷 仁,冨安 卓滋   1-ブチル-3-メチルイミダゾリウム系イオン液体中における銅-クロロ錯生成反応  

    日本分析化学会第66年会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

  • 内田 葵,児玉谷 仁,武内 章記,丸本 幸治,堀川 恵司,神崎 亮,冨安 卓滋   東シナ海および周辺海域底質の水銀濃度分布  

    日本分析化学会第66年会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京  

  • 谷末武人,児玉谷 仁,藤岡 貴浩,神崎 亮,冨安 卓滋   HPLC-PR-CL法を利用したN-ニトロソジメチルアミン前駆物質の探索と評価  

    日本分析化学会第66年会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:東京  

  • 三ツ井 亮洸,児玉谷 仁,神崎 亮,冨安 卓滋   鹿児島湾における海水中水銀化学種の濃度変動と海底熱水噴気活動の影響  

    日本分析化学会第66年会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

  • 安松 空良,外薗 寿宗,児玉谷 仁,神崎 亮,冨安 卓滋   鹿児島県旧金鉱山周辺地域における土壌中水銀の形態別分布  

    日本分析化学会第66年会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

  • KODAMATANI Hitoshi, DAIBA Yuri, TAKEUCHI Akinori, ICHITANI Katsuyuki, KANZAKI Ryo, TOMIYASU Takashi   PRODUCTION OF METHYLMERCURY IN HG(II) ION-ADDED FLOODED PADDY FIELD SOIL AND ITS ACCUMULATION IN RICE   International conference

    ICMGP2017 

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    Event date: 2017.7

    Language:English   Presentation type:Poster presentation  

    Venue:Providence, RI, USA  

  • TOMIYASU Takashi, BARANSANO Christine, HAMADA Yuriko, KODAMATANI Hitoshi, KANZAKI Ryo, HIDAYATI Nuril, RAHAJOE Joeni   DISTRIBUTION OF TOTAL AND ORGANIC MERCURY CONCENTRATIONS IN SOILS AROUND ASGM AREA, WEST JAVA, INDONESIA, AND DEPENDENCE OF MERCURY CONCENTRATIONS ON ORGANIC MATTER CONTENT   International conference

    ICMGP2017 

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    Event date: 2017.7

    Language:English   Presentation type:Poster presentation  

    Venue:Providence, RI, USA  

  • 児玉谷仁,増長洋登,丸山昇,藤岡貴浩,冨安卓志   イオン交換モジュールを利用したN-ニトロソアミン類のHPLC-化学発光検出  

    第77回分析化学討論会 

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    Event date: 2017.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都  

  • 安松空良,児玉谷仁,神崎亮,冨安 卓滋   鹿児島県北部旧金鉱山周辺における水銀動態  

    第77回分析化学討論会 

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    Event date: 2017.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都  

  • 三ツ井亮洸,児玉谷仁,神崎 亮,冨安卓滋   鹿児島湾奥部における海水中水銀濃度分布の季節変動  

    第77回分析化学討論会 

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    Event date: 2017.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都  

  • 中川美里,児玉谷仁,神崎亮,冨安卓滋   水素化物発生原子吸光光度法による環境水中のヒ素およびアンチモンの定量  

    第77回分析化学討論会 

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    Event date: 2017.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都  

  • 谷末武人,児玉谷仁,藤岡貴浩,神崎亮,冨安卓滋   水処理過程におけるN-ニトロソジメチルアミン生成能評価法の再検討  

    第77回分析化学討論会 

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    Event date: 2017.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都  

  • Roback, S., Ishida, K., Plumlee, M., Kodamatani, H., Fujioka, T., Dinh, A   Validation and optimization of an alternative method for NDMA analysis requiring less time, cost, and sample volume   International conference

    American Chemical Society National Meeting 

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    Event date: 2017.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:San Francisco, CA, USA  

  • 丸本幸治,武内章記,児玉谷 仁,今井祥子,小畑元,張 頸   東シナ海黒潮海流域における海水中水銀の形態別濃度とその鉛直分布  

    2016年度日本地球科学会年会  2016年度日本地球科学会年会

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    Event date: 2016.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:大阪  

  • 内田脩麻,神崎亮,冨安卓滋,児玉谷仁,中村太悟   イオン液体 1-ブチル-3-メチルイミダゾリウムビス{(トリフルオロメチル)スルホニル}アミド(C4mimTf2N)中における銅(Ⅱ)クロロ錯生成反応熱力学  

    日本分析化学会第65年会  日本分析化学会第65年会

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

  • 児玉谷 仁,森﨑心太郎,児玉裕里,一谷勝之,神崎亮,冨安 卓滋   無機水銀汚染を受けた水田土壌からのメチル水銀の生成と米への蓄積  

    日本分析化学会第65年会  日本分析化学会第65年会

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    Event date: 2016.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:札幌  

  • 児玉谷 仁,岩屋良美,嵯峨慎,齊藤恵逸,山崎重雄,神崎亮,冨安卓滋   ニトロソ化を利用した第二級アミンの高感度測定法の開発  

    第23回クロマトグラフィーシンポジウム  第23回クロマトグラフィーシンポジウム

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    Event date: 2016.6

    Language:Japanese   Presentation type:Poster presentation  

    Venue:甲府  

  • 丸本幸治,武内章記,児玉谷仁,今井祥子   東シナ海における海面からの水銀放出フラックスの推定  

    第24回日本環境化学討論会  第24回日本環境化学討論会

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    Event date: 2016.6

    Language:Japanese   Presentation type:Poster presentation  

    Venue:新潟  

  • Hitoshi Kodamatani, Souta Katsuma, Azusa Shigetomi, Toshimune Hokazono, Ryusuke Imura, Ryo Kanzaki, Takashi Tomiyasu   Emission and behavior of Mercury, from the fumarolic activity of Minamijigokudani, Mt. Myoko, Japan   International conference

    PACIFICHEM2015  PACIFICHEM2015

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    Event date: 2015.12

    Language:English   Presentation type:Poster presentation  

    Venue:米国  

  • 岩屋 良美,児玉谷 仁,山崎 重雄,齊藤 惠逸   ニトロソアミンを経由した第2アミンのHPLC-化学発光検出 (2)  

    日本分析化学会第64年会  日本分析化学会第64年会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:福岡  

  • 冨安 卓滋,御手洗 麻衣,児玉谷 仁,河野 百合子,Wilder Leonardo Gamboa Ruiz1,神崎 亮   鹿児島湾海水中水銀濃度変動に及ぼす海底噴気熱水活動の影響  

    日本分析化学会第64年会  日本分析化学会第64年会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Venue:福岡  

  • 台場 輝,児玉谷 仁,冨安 卓滋,神崎 亮   プロトン性イオン液体硝酸エチルアンモニウム(EAN)中におけるpH標準の選定および決定  

    日本分析化学会第64年会  日本分析化学会第64年会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

  • Wilder Leonardo Gamboa Ruiz,冨安 卓滋,児玉谷 仁,神崎 亮   Mercury in the Sediments of Kagoshima Bay (Southern Kyushu): Sources, Distribution and Controlling Factors  

    日本分析化学会第64年会  日本分析化学会第64年会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (keynote)  

    Venue:福岡  

  • 佐川 保奈美,岩谷 江里子,児玉谷 仁,山崎 重雄,齊藤 惠逸   ルテニウム錯体の化学発光を用いた血中・尿中のホモシステイン及びホモシスチン分析法の開発  

    日本分析化学会第64年会  日本分析化学会第64年会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:福岡  

  • 嵯峨 慎,森 弘多,児玉谷 仁,山崎 重雄,齊藤 惠逸   グルコースオキシダーゼ及びCo(III)錯体を用いるグルコースのルミノール化学発光検出  

    日本分析化学会第64年会  日本分析化学会第64年会

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    Event date: 2015.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:福岡  

  • Hitoshi Kodamatani, Takashi Tomiyasu   Determination method for measurement of methylmercury in soils and sediments   Invited International conference

    2nd Asian Symposium for Analytical Sciences  2nd Asian Symposium for Analytical Sciences

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    Event date: 2015.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:福岡  

  • Hitoshi Kodamatani, Chihiro Maeda, Steven J. Balogh, Yabing H. Nollet, Ryo Kanzaki, Takashi Tomiyasu   The influence of sample drying and storage conditions on methylmercury determination in soils and sediments   International conference

    12th International Conference on Mercury as a Global Pollutant  12th International Conference on Mercury as a Global Pollutant

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    Event date: 2015.6

    Language:English   Presentation type:Poster presentation  

    Venue:韓国  

  • Takashi Tomiyasu, Hitoshi Kodamatani, Akito Matsuyama, Ryusuke Imura, Hirokatsu Akagi, David Kocman, Jo?e Kotnik, Vesna Fajon, Milena Horvat   Distribution of total, methyl, and ethyl mercury concentrations in soils near Idrija mercury mine, Slovenia   International conference

    12th International Conference on Mercury as a Global Pollutant  12th International Conference on Mercury as a Global Pollutant

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    Event date: 2015.6

    Language:English   Presentation type:Poster presentation  

    Venue:韓国  

  • Takashi Tomiyasu, Hitoshi Kodamatani, Yuriko Kono, Akito Matsuyama, Ryusuke Imura, Nuril Hidayati, Joeni Setijo Rahajoe   Mercury concentration in paddy field soil and freshwater snails around the small-scale gold mining area, Cikaniki River, West Java, Indonesia   International conference

    12th International Conference on Mercury as a Global Pollutant  12th International Conference on Mercury as a Global Pollutant

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    Event date: 2015.6

    Language:English   Presentation type:Poster presentation  

    Venue:韓国  

  • Akinori Takeuchi, Hitoshi Kodamatani, Takashi Tomiyasu, Yuriko Kono, Masahiro Yamamoto, Katsumi Marumo   Extremely low ratio of MMHg to total mercury in submarine hydrothermal mussels (Bathymodiolus japonicus)   International conference

    12th International Conference on Mercury as a Global Pollutant  12th International Conference on Mercury as a Global Pollutant

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    Event date: 2015.6

    Language:English   Presentation type:Poster presentation  

    Venue:韓国  

  • 簗瀬 梓,児玉谷 仁,神崎 亮,本村 浩之,冨安 卓滋   鹿児島湾における魚体中水銀濃度  

    日本分析化学会第75回分析化学討論会  日本分析化学会第75回分析化学討論会

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    Event date: 2015.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:甲府  

  • Christine Baransano, 河野 百合子, 児玉谷 仁, 神崎 亮, Joeni S. Rahajoe, Nuril Hidayati, 冨安 卓滋   インドネシア西ジャワ州チカニキ川周辺土壌中の水銀濃度分布に及ぼす金精錬活動の影響  

    日本分析化学会第75回分析化学討論会  日本分析化学会第75回分析化学討論会

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    Event date: 2015.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:甲府  

  • 重冨 あずさ,児玉谷 仁,外薗 寿宗,勝間 創太,山崎 仁美,神崎 亮,冨安 卓滋   旧水銀鉱山周辺における水銀分布とその化学形態  

    日本分析化学会第75回分析化学討論会  日本分析化学会第75回分析化学討論会

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    Event date: 2015.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:甲府  

  • 児玉谷 仁,神崎 亮,冨安卓滋   土壌中メチル水銀の選択的抽出法の確立  

    第33回溶媒抽出討論  第33回溶媒抽出討論

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    Event date: 2014.12

    Language:Japanese  

    Venue:神戸  

    国内学会

  • 岩谷 江里子,児玉谷 仁,山崎 重雄,齊藤 惠逸   ルテニウム錯体化学発光法を用いたメチルイミダゾール定量法の開発  

    日本分析化学会第63年会  日本分析化学会第63年会

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    Event date: 2014.9

    Language:Japanese  

    Venue:広島  

    国内学会

  • 佐川 保奈美,児玉谷 仁,山崎 重雄,齊藤 惠逸   ルテニウム錯体化学発光法を用いた血中・尿中ホモシステイン定量のための基礎的検討  

    日本分析化学会第63年会  日本分析化学会第63年会

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    Event date: 2014.9

    Language:Japanese  

    Venue:広島  

    国内学会

  • 速水 祐人,岩屋 良美,児玉谷 仁,山崎 重雄, 齊藤恵逸   ルテニウム錯体化学発光法を用いたメチルイミダゾール定量法の開発  

    日本分析化学会第63年会  日本分析化学会第63年会

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    Event date: 2014.9

    Language:Japanese  

    Venue:広島  

    国内学会

  • 冨安 卓滋,尾畑 勝義,児玉谷 仁,河野 百合子,神崎 亮,山本正浩,武内 章記,丸茂 克美   海底熱水系周辺における底質及び生体試料中水銀濃度  

    2014年度日本地球化学会年会  2014年度日本地球化学会年会

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    Event date: 2014.9

    Language:Japanese  

    Venue:富山  

    国内学会

  • 武内 章記,山本 正浩,児玉谷 仁,冨安 卓滋,丸茂 克実   伊豆小笠原・沖縄トラフ海底熱水域における水銀同位体組成の特徴  

    2014年度日本地球化学会年会  2014年度日本地球化学会年会

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    Event date: 2014.9

    Language:Japanese  

    Venue:富山  

    国内学会

  • 児玉谷 仁,前田 千尋,外薗 寿宗,神崎 亮,冨安 卓滋   旧水銀鉱山周辺土壌における総水銀およびメチル水銀の分布  

    2014年度日本地球化学会年会  2014年度日本地球化学会年会

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    Event date: 2014.9

    Language:Japanese  

    Venue:富山  

    国内学会

  • 山本 正浩,児玉谷 仁,河野 百合子,武内 章記,高井 研,冨安 卓滋,丸茂 克美   海底熱水鉱床探査ツールとしての深海用水銀センサーの開発  

    2014年度日本地球化学会年会  2014年度日本地球化学会年会

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    Event date: 2014.9

    Language:Japanese  

    Venue:富山  

    国内学会

  • Takashi Tomiyasu, Minato Takuya, Gamboa Ruiz Wilder Leonardo, Hitoshi Kodamatani, Yuriko Kono, Masayasu Hidaka, Kimihiko Oki, Ryo Kanzaki, Yoko Taniguchi, Akito Matsuyama   Distribution of mercury species in water of Kagoshima Bay, Japan, in relation with submarine fumaroles   International conference

    The 17th International Conference on Heavy Metals in the Environment  The 17th International Conference on Heavy Metals in the Environment

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    Event date: 2014.9

    Language:English  

    Venue:中国  

    国際学会

  • Wilder Leonardo Gamboa Ruiz, Takashi Tomiyasu, Hitoshi Kodamatani, Yuriko Kono, Ryo Kanzaki, Kimihiko Oki, Masayasu Hidaka   Spatial Distribution of Hg Emitted from Hydrothermal Vents in Bottom Sediments from Kagoshima Bay and its Relationship with Physicochemical Factors   International conference

    The 17th International Conference on Heavy Metals in the Environment  The 17th International Conference on Heavy Metals in the Environment

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    Event date: 2014.9

    Language:English  

    Venue:中国  

    国際学会

  • 重冨 あずさ,児玉谷 仁,神﨑 亮,冨安 卓滋   化粧品中のN-ニトロソジエタノールアミンの分析法の開発  

    第74回分析化学討論会  第74回分析化学討論会

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    Event date: 2014.5

    Language:Japanese  

    Venue:福島  

    国内学会

  • 外薗 寿宗,児玉谷 仁,神﨑 亮,井村 隆介,冨安 卓滋   鹿児島県旧金鉱山周辺土壌中水銀濃度分布  

    第74回分析化学討論会  第74回分析化学討論会

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    Event date: 2014.5

    Language:Japanese  

    Venue:福島  

    国内学会

  • 石橋 純一郎,永富 健太郎,高橋 稔,児玉谷 仁,冨安 卓滋,武内 章記,山中 寿朗   伊豆小笠原弧の海底火山に伴う熱水地球化学  

    地球惑星連合大会2014  地球惑星連合大会2014

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    Event date: 2014.4

    Language:Japanese  

    Venue:神奈川  

    国内学会

  • 武内 章記,冨安 卓滋,児玉谷 仁,山本 正浩,丸茂 克美   海底熱水域における水銀の質量非依存同位体分別  

    地球惑星連合大会2014  地球惑星連合大会2014

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    Event date: 2014.4

    Language:Japanese  

    Venue:神奈川  

    国内学会

  • 山本正浩,高井研,冨安卓志,児玉谷仁,河野百合子,武内章記,丸茂克己   深海用水銀センサーの開発  

    ブルーアース2014  ブルーアース2014

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    Event date: 2014.2

    Language:Japanese  

    Venue:東京  

    国内学会

  • 児玉谷 仁,前田千尋,河野百合子,神崎亮,冨安卓滋   HPLC-化学発光検出法による環境試料中の有機水銀分析  

    第51回フローインジェクション分析講演会  第51回フローインジェクション分析講演会

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    Event date: 2013.11

    Language:Japanese  

    Venue:熊本  

    国内学会

  • Hitoshi Kodamatani, Akito Matsuyama, Steven Balogh, Vesna Fajon, Milena Horvat Takashi Tomiyasu   Inter-laboratory comparative study of monomethylmercury and monoethylmercury determination in various soil/sediment samples by different analytical methods   International conference

    11th International Conference on Mercury as a Global Pollutant  11th International Conference on Mercury as a Global Pollutant

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    Event date: 2013.8

    Language:English  

    Venue:スコットランド  

    国際学会

  • Yuriko Kono, oeni Setijo Rahajoe, Nuril Hidayati, Hitoshi Kodamatani, Takashi Tomiyasu   Distribution of dissolved mercury in river water around artisanal and small-scale gold mining areas in West Java, Indonesia   International conference

    11th International Conference on Mercury as a Global Pollutant  11th International Conference on Mercury as a Global Pollutant

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    Event date: 2013.8

    Language:English  

    Venue:スコットランド  

    国際学会

  • Takashi Tomiyasu, Takuya Minato, Hitoshi Kodamatani, Yuriko Kono, Masayasu Hidaka, Kiminiko Oki, Yoko Taniguchi, Akito Matsuyama   The influence of submarine fumaroles on the seasonal changes of mercury species in water of Kagoshima Bay, Japan   International conference

    11th International Conference on Mercury as a Global Pollutant  11th International Conference on Mercury as a Global Pollutant

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    Event date: 2013.8

    Language:English  

    Venue:スコットランド  

    国際学会

  • 神崎 亮,岸下 真理子,児玉谷 仁,冨安 卓滋   1-ブチル-3-メチルイミダゾリウム系イオン液体中におけるCu2+イオン錯生成反応の陰イオン依存性   International conference

    第73回分析化学討論会  第73回分析化学討論会

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    Event date: 2013.5

    Language:English  

    Venue:北海道  

    国際学会

  • Wilder Leonardo Gamboa Ruiz, 児玉谷 仁, 神崎 亮,河野 百合子,日高 正康,大木 公彦,冨安 卓滋   Assessment of the Spatial Distribution of Total Mercury in Bottom Sediments of Kagoshima Bay  

    第73回分析化学討論会  第73回分析化学討論会

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    Event date: 2013.5

    Language:Japanese  

    Venue:北海道  

    国内学会

  • 坂口 建,児玉谷 仁,橋口 尚樹,有村 太一,吉本 悟,神崎 亮,冨安 卓滋   浄水処理過程におけるN-ニトロソジメチルアミンのモニタリング調査  

    第73回分析化学討論会  第73回分析化学討論会

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    Event date: 2013.5

    Language:Japanese  

    Venue:北海道  

    国内学会

  • 岩屋 良美,永井 めぐみ,児玉谷 仁,山崎 重雄,齊藤 惠逸   ニトロソアミンを経由した第2アミンのHPLC-化学発光検出  

    第73回分析化学討論会  第73回分析化学討論会

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    Event date: 2013.5

    Language:Japanese  

    Venue:北海道  

    国内学会

  • 児玉谷 仁,松山 明人,河野 百合子,神崎 亮,冨安 卓滋   土壌・底質中のメチル水銀分析-試料処理における諸問題の検討-  

    第73回分析化学討論会  第73回分析化学討論会

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    Event date: 2013.5

    Language:Japanese  

    Venue:北海道  

    国内学会

  • 丸茂克美,藤本ひかり,武内章記,冨安卓滋,児玉谷仁,河野百合子,小室光世,山本正浩,嶋永元裕,NT12-10 乗船研究者一同   明神海丘及び明神礁カルデラの海底熱水系の硫化物と堆積物の水銀濃度と水銀同位体組成  

    ブルーアース2013  ブルーアース2013

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    Event date: 2013.3

    Language:Japanese  

    Venue:東京海洋大学  

    国内学会

  • 児玉谷 仁   ルテニウム錯体化学発光反応におけるコリアクタント分子構造の最適化および環境・生体・食品中微量物質の分析  

    日本分析化学会第61年会  日本分析化学会第61年会

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    Event date: 2012.9

    Language:Japanese  

    Venue:石川  

    国内学会

  • Gamboa Ruiz Wilder Leonardo, 児玉谷 仁, 神崎 亮, 河野 百合子, 日高 正康, 大木 公彦, 冨安 卓滋   Total Mercury Distribution in Sediments of Kagoshima Bay: Influence of Submarine Fumarole  

    日本分析化学会第61年会  日本分析化学会第61年会

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    Event date: 2012.9

    Language:Japanese  

    Venue:石川  

    国内学会

  • 湊 拓也, 児玉谷 仁, 神崎 亮, 河野 百合子, 日高 正康, 大木 公彦, 冨安 卓滋   鹿児島湾における海水中水銀濃度の季節変動と海底噴気熱水活動の影響  

    日本分析化学会第61年会  日本分析化学会第61年会

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    Event date: 2012.9

    Language:Japanese  

    Venue:石川  

    国内学会

  • 河野 百合子, Rahajioe Joeni S., 児玉谷 仁, 神崎 亮, 冨安 卓滋   インドネシア共和国グヌン・ハリムン―サラク国立公園における大気中水銀濃度変動  

    日本分析化学会第61年会  日本分析化学会第61年会

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    Event date: 2012.9

    Language:Japanese  

    Venue:石川  

    国内学会

  • HPLC-化学発光検出法による水道水中N-ニトロソアミン類の分析   伊藤 慎也,坂口 建, 児玉谷 仁, 山崎 重雄, 冨安 卓滋, 齊藤 惠逸  

    日本分析化学会第61年会  日本分析化学会第61年会

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    Event date: 2012.9

    Language:Japanese  

    Venue:石川  

    国内学会

  • 丸茂 克美, 山本 正浩, 冨安 卓滋, 児玉谷 仁, 河野 百合子, 武内 章記, 小室 光世   沖縄トラフ伊平屋北海丘海底熱水系の硫化物及び堆積物の化学分析値と水銀同位体組成  

    資源地質学会第62回年会学術講演会  資源地質学会第62回年会学術講演会

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    Event date: 2012.6

    Language:Japanese  

    Venue:東京  

    国内学会

  • 山本正浩,高井研,河野百合子,児玉谷仁,冨安卓滋,小室光世,丸茂克美   ストリッピングボルタンメトリー法による深海用水銀センサーの開発  

    電気化学会第79回大会  電気化学会第79回大会

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    Event date: 2012.3

    Language:Japanese  

    Venue:静岡  

    国内学会

  • 児玉谷仁,伊藤慎也,齊藤恵逸,冨安卓滋   水道水中N-ニトロソジメチルアミンの高感度分析法の開発  

    第46回日本水環境学会年会  第46回日本水環境学会年会

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    Event date: 2012.3

    Language:Japanese  

    Venue:東京  

    国内学会

  • 冨安卓滋,児玉谷仁,河野百合子,丸茂克美,山本正浩,小室光世,中川聡,NT11-19 乗船研究者一同   伊平屋北海丘海底熱水系周辺における環境試料中水銀濃度分布  

    ブルーアース2012  ブルーアース2012

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    Event date: 2012.2

    Language:Japanese  

    Venue:東京  

    国内学会

  • 丸茂克美,山本正浩,冨安卓滋,児玉谷仁,河野百合子,小室光世,武内章記,中川聡,NT11-19 乗船研究者一同   伊平屋北海丘の海底熱水系の水銀濃度と同位体組成  

    ブルーアース2012  ブルーアース2012

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    Event date: 2012.2

    Language:Japanese  

    Venue:東京  

    国内学会

  • 児玉谷仁,松山明人,河野百合子,齊藤恵逸,神﨑亮,冨安卓滋   HPLC-化学発光検出法を利用した土壌・底質中の有機水銀の高感度分析法の開発  

    第30 回溶媒抽出討論会  第30 回溶媒抽出討論会

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    Event date: 2011.11

    Language:Japanese  

    Venue:宮崎  

    国内学会

  • 児玉谷仁,松山明人,河野百合子,齊藤惠逸,神崎亮,冨安卓滋   ルテニウム錯体化学発光検出法を利用した水銀化合物の形態別分析法の開発(4)  

    日本分析化学会第60年会  日本分析化学会第60年会

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    Event date: 2011.9

    Language:Japanese  

    Venue:名古屋  

    国内学会

  • 河野百合子,児玉谷仁,神崎亮,冨安卓滋   鹿児島市における大気中水銀濃度変動  

    日本分析化学会第60年会  日本分析化学会第60年会

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    Event date: 2011.9

    Language:Japanese  

    Venue:名古屋  

    国内学会

  • 冨安卓滋,河野百合子,児玉谷仁,神崎亮,Hidayati Nuril,Setijo Rahajoe Joeni   インドネシア、ジャワ島西部小規模金採掘地域における土壌中総水銀濃度分布と土壌化学成分  

    日本分析化学会第60年会  日本分析化学会第60年会

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    Event date: 2011.9

    Language:Japanese  

    Venue:名古屋  

    国内学会

  • 小山泰弘,児玉谷仁,山崎重雄,齊藤惠逸   ルテニウム錯体化学発光法を用いたシステイン分析法の開発  

    日本分析化学会第60年会  日本分析化学会第60年会

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    Event date: 2011.9

    Language:Japanese  

    Venue:名古屋  

    国内学会

  • TOMIYASU Takashi, MATSUOKA Hiroyuki, KODAMATANI Hitoshi, KONO Yuriko, MATSUYAMA Akito, HIDAKA Masayasu, OKI Kimihiko   INFLUENCE OF SUBMARINE FUMAROLES ON THE DISTRIBUTION OF MERCURY IN WATER AND SEDIMENT OF KAGOSHIMA BAY, JAPAN   International conference

    10th International Conference on Mercury as a Global Pollutant  10th International Conference on Mercury as a Global Pollutant

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    Event date: 2011.7

    Language:English  

    Venue:Canada  

    国際学会

  • KONO Yuriko, HIDAYATI Nuril, RAHAJOE, Joeni S, KODAMATANI Hitoshi, KANZAKI Ryo, TOMIYASU Takashi   ESTIMATION OF ATMOSPHERIC MERCURY LEVELS WITH NATIVE EPIPHYTIC FERNS IN SMALL-SCALE GOLD MINING AREA, WEST JAVA, INDONESIA   International conference

    10th International Conference on Mercury as a Global Pollutant  10th International Conference on Mercury as a Global Pollutant

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    Event date: 2011.7

    Language:English  

    Venue:Canada  

    国際学会

  • KODAMATANI Hitoshi, MATSUYAMA Akito, KONO Yuriko, KANZAKI Ryo, SAITO Keiitsu, TOMIYASU Takashi   SIMPLE AND SENSITIVE METHOD FOR DETERMINATION OF METHYLMERCURY IN ENVIRONMENTAL SAMPLES BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY WITH CHEMILUMINESCENCE DETECTION   International conference

    10th International Conference on Mercury as a Global Pollutant  10th International Conference on Mercury as a Global Pollutant

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    Event date: 2011.7

    Language:English  

    Venue:Canada  

    国際学会

  • 児玉谷仁   有機水銀の選択的高感度分析法の開発  

    第38回生活環境研究会  第38回生活環境研究会

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    Event date: 2011.3

    Language:Japanese  

    Venue:石川  

    研究会

  • 古城真生,児玉谷仁,神崎亮,冨安卓滋   N,N-ジメチルアニリンと3-メチル-2-ベンゾチアゾリノンヒドラゾンの酸化カップリング反応に対する銅(II)イオン触媒の反応速度論的検討  

    日本分析化学会第59年会  日本分析化学会第59年会

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    Event date: 2010.9

    Language:Japanese  

    Venue:仙台  

    国内学会

  • 前畑健太,児玉谷仁,神崎亮,冨安卓滋   メチルオレンジ‐臭素酸カリウム反応系に対する触媒作用を利用した微量鉄(II)イオン定量法の開発とその速度論的検討  

    日本分析化学会第59年会  日本分析化学会第59年会

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    Event date: 2010.9

    Language:Japanese  

    Venue:仙台  

    国内学会

  • 本瀬一輝,岩崎志朗,渡辺雄二郎,児玉谷仁,大嶋俊一,藤永薫,小松優   湿地帯水質保全のための化学処理法の開発-Mg/Al系層状複水酸化物によるリン酸イオンの除去  

    日本分析化学会第59年会  日本分析化学会第59年会

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    Event date: 2010.9

    Language:Japanese  

    Venue:仙台  

    国内学会

  • 三橋長治,本瀬一輝,渡辺雄二郎,児玉谷仁,大嶋俊一,藤永薫,鶴房繁和,小松 優   ラムサール条約登録認定湿地・石川県片野鴨池の定点水質分析  

    日本分析化学会第59年会  日本分析化学会第59年会

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    Event date: 2010.9

    Language:Japanese  

    Venue:仙台  

    国内学会

  • 河野百合子,Rahajoe Joeni Setijo,児玉谷仁,神崎亮,冨安卓滋   インドネシアの小規模金採掘集落内および天然林内における大気中水銀濃度の経時変化  

    日本分析化学会第59年会  日本分析化学会第59年会

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    Event date: 2010.9

    Language:Japanese  

    Venue:仙台  

    国内学会

  • 松岡博之,山本温彦,児玉谷仁,穴澤活郎,冨安卓滋   四国美郷キースラーガー鉱床地域における高硫酸水の形成過程  

    日本分析化学会第59年会  日本分析化学会第59年会

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    Event date: 2010.9

    Language:Japanese  

    Venue:仙台  

    国内学会

  • 児玉谷仁,齊藤惠逸,神崎亮,冨安卓滋   ルテニウム錯体化学発光検出法を利用した水銀化合物の形態別分析法の開発(3)  

    日本分析化学会第59年会  日本分析化学会第59年会

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    Event date: 2010.9

    Language:Japanese  

    Venue:仙台  

    国内学会

  • Takashi Tomiyasu, Y. Kono, H. Kodamatani, N. Hidayati, J. Setijo Rahajoe   The distribution of mercury around a small scale gold mining area in Indonesia  

    14. Internationl Workshop on Mercury in contaminated sites  14. Internationl Workshop on Mercury in contaminated sites

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    Event date: 2010.9

    Language:Japanese  

    Venue:Slovenia  

    研究会

  • 児玉谷仁,齊藤惠逸,神崎亮,冨安卓滋   ルテニウム錯体化学発光検出法を利用した水銀化合物の形態別分析法の開発(2)  

    第71回分析化学討論会  第71回分析化学討論会

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    Event date: 2010.5

    Language:Japanese  

    Venue:島根  

    国内学会

  • 冨安卓滋,河野百合子,児玉谷仁,神崎亮,Hidayati Nuril,SetijoRahajoe Joeni   インドネシア、ジャワ島西部チカニキ川上流域における土壌及び河川底質中水銀濃度分布  

    第71回分析化学討論会  第71回分析化学討論会

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    Event date: 2010.5

    Language:Japanese  

    Venue:島根  

    国内学会

  • 河野百合子,SetijoRahajioe,Joeni Hidayati Nuril,児玉谷仁,神崎亮,冨安卓滋   インドネシアジャワ島西部の小規模金採掘地域におけるシマオオタニワタリを用いた大気中水銀のバイオモニタリング  

    第71回分析化学討論会  第71回分析化学討論会

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    Event date: 2010.5

    Language:Japanese  

    Venue:島根  

    国内学会

  • 小杉由美加,河田裕介,児玉谷仁,山崎重雄,齊藤惠逸   溶媒抽出-ルミノール化学発光法を組み合わせた過塩素酸イオンの間接検出  

    第71回分析化学討論会  第71回分析化学討論会

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    Event date: 2010.5

    Language:Japanese  

    Venue:島根  

    国内学会

  • 小松司明,河田裕介,児玉谷仁,山崎重雄,齊藤惠逸   ルミノールを用いた強心配糖体の化学発光検出  

    第71回分析化学討論会  第71回分析化学討論会

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    Event date: 2010.5

    Language:Japanese  

    Venue:島根  

    国内学会

  • 谷末 武人, 児玉谷 仁, 藤岡 貴浩, 神崎 亮, 冨安 卓滋   HPLC-PR-CL法を利用したN-ニトロソジメチルアミン前駆物質の探索と評価  

    日本分析化学会講演要旨集  2017.8  (公社)日本分析化学会

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    Language:Japanese  

  • 日高 朋也,児玉谷 仁,冨安 卓滋,神﨑 亮   超濃厚リチウムビス(トリフルオロメタンスルホニル)イミド水溶液の酸塩基性  

    第44回溶液化学シンポジウム  2022.10  溶液化学会

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    Language:Japanese  

    Venue:鹿児島  

  • 脇丸 太樹,児玉谷 仁,神﨑 亮,冨安 卓滋   鹿児島湾における海水中懸濁態総水銀の濃度変動  

    日本分析化学会第71年会  2022.9  (公社)日本分析化学会

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    Language:Japanese  

    Venue:岡山  

  • 上蔀 隼人,児玉谷 仁,神崎 亮,冨安 卓滋   鹿児島湾産魚類器官中の水銀及びセレン濃度  

    日本分析化学会第71年会  2022.9  (公社)日本分析化学会

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    Language:Japanese  

    Venue:岡山  

  • 日高 朋也,児玉谷 仁,冨安 卓滋,神﨑 亮   リチウム(ビストリフルオロメタンスルホニル)イミドによる濃厚電解質溶液を反応場とした酸塩基反応とそのメカニズム  

    日本分析化学会第71年会  2022.9  (公社)日本分析化学会

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    Language:Japanese  

    Venue:岡山  

  • 児玉谷 仁,新田 晃大,一谷 勝之,神崎 亮,冨安 卓滋   稲の品種とコメのメチル水銀汚染  

    日本分析化学会第71年会  2022.9  (公社)日本分析化学会

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    Language:Japanese  

    Venue:岡山  

  • 上蔀 隼人,児玉谷 仁,神崎 亮,冨安 卓滋   鹿児島湾生体試料中の水銀及びセレン濃度と海底火山活動の影響  

    第82回分析化学討論会  2022.5  (公社)日本分析化学会

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    Language:Japanese  

    Venue:水戸  

  • 脇丸 太樹,児玉谷 仁,神﨑 亮,冨安 卓滋   鹿児島湾海水中水銀濃度に及ぼす火山活動の影響  

    第82回分析化学討論会  2022.5  (公社)日本分析化学会

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    Language:Japanese  

    Venue:水戸  

  • 上蔀 隼人,児玉谷 仁,神崎 亮,冨安 卓滋   鹿児島湾産魚類およびプランクトン中のセレン及び水銀濃度  

    令和3年度メチル水銀研究ミーティング  2022.2  環境省

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    Language:Japanese  

    Venue:Web  

  • 杉原 健太, 児玉谷 仁, 神﨑 亮,冨安 卓滋   硝酸メチルの測定法開発  

    日本分析化学会第70年会  2021.9  (公社)日本分析化学会

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    Language:Japanese  

    Venue:神戸(オンライン)  

  • 石谷 祐昌,北村 有迅,川端 訓代,児玉谷 仁   鹿児島県北西部における地下水の特徴から見た地下構造  

    日本地質学会第128学術大会  2021.9  日本地質学会

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    Language:Japanese  

    Venue:名古屋  

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Awards

  • 理事長賞

    2014.6   公益財団法人 鉄鋼環境基金   有機水銀の選択的高感度分析システムの開発

    児玉谷 仁

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    Country:Japan

  • 奨励賞

    2012.9   公益社団法人 日本分析化学会   ルテニウム錯体化学発光反応におけるコリアクタント分子構造の最適化および環境・生体・食品中微量物質の分析

    児玉谷 仁

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    Country:Japan

Research Projects

  • コメのメチル水銀汚染リスク評価:土壌環境・化学組成・無機水銀形態が及ぼす影響

    Grant number:24H00782  2024.4 - 2028.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    児玉谷 仁, 山本 正浩, 高木 善弘, 武内 章記, 一谷 勝之, 神崎 亮, 冨安 卓滋

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    Grant amount:\47970000 ( Direct Cost: \36900000 、 Indirect Cost:\11070000 )

  • 海水中の硝酸イオン・亜硝酸イオンの簡易で高感度な測定システムの開発(継続)

    2024.4 - 2025.3

    ソルト・サイエンス研究振興財団  一般公募研究 

  • 鹿児島湾海底熱水活動とメチル水銀およびジメチル水銀の生成挙動

    Grant number:23K18549  2023.6 - 2026.3

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

    児玉谷 仁, 冨安 卓滋

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    Grant amount:\6370000 ( Direct Cost: \4900000 、 Indirect Cost:\1470000 )

  • 鹿児島湾における温度躍層の形成とメチル水銀生成の関係

    2023.4 - 2024.3

    サンケイ科学振興財団  研究助成金 

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    Authorship:Principal investigator  Grant type:Competitive

  • 海水中の硝酸イオン・亜硝酸イオンの簡易で高感度な測定システムの開発

    2023.4 - 2024.3

    ソルト・サイエンス研究振興財団  一般公募研究 

  • Japan-U.S. joint development of online water quality management method to realize highly reliable potable water reuse

    Grant number:22KK0061  2022.10 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

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    Grant amount:\20150000 ( Direct Cost: \15500000 、 Indirect Cost:\4650000 )

  • ジメチル水銀測定システムの確立と鹿児島湾海水における挙動調査

    2022.4 - 2023.3

    サンケイ科学振興財団  研究助成金 

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    Grant type:Competitive

    Grant amount:\400000

  • 水処理システムにおける有機窒素化合物の網羅的モニタリング法の開発

    Grant number:21K18753  2021.7 - 2023.3

    日本学術振興会  科学研究費助成事業 挑戦的研究(萌芽)  挑戦的研究(萌芽)

    児玉谷 仁

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    Grant amount:\6370000 ( Direct Cost: \4900000 、 Indirect Cost:\1470000 )

  • コメのメチル水銀汚染リスク低減のための土壌環境評価法の検討

    Grant number:21H03621  2021.4 - 2024.3

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    児玉谷 仁, 山本 正浩, 武内 章記, 一谷 勝之, 神崎 亮, 冨安 卓滋

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    Grant amount:\17550000 ( Direct Cost: \13500000 、 Indirect Cost:\4050000 )

  • ニトロソアミン測定

    2020.5 - 2020.7

    民間企業  一般受託研究 

  • ニトロソアミン測定

    2019.11 - 2020.3

    民間企業  一般受託研究 

  • 逆浸透膜透過性物質のオンラインモニタリング法の開発

    2019.10 - 2021.9

    クリタ・水環境科学振興財団  国内研究助成 

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    Grant type:Competitive

  • The Dynamics of Mercury and Selenium Released by Submarine Volcanic Activity in Kagoshima Bay

    Grant number:19H01168  2019.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

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    Authorship:Coinvestigator(s) 

    Grant amount:\45760000 ( Direct Cost: \35200000 、 Indirect Cost:\10560000 )

  • 下水飲用再利用のしくみを変える次世代膜の開発

    2018.4 - 2021.3

    科学研究費補助金  基盤研究(B)

  • Behavior of MeHg production in a Hg(II) ion spiked paddy field soil during multi-year rice cultivation and the mechanism of MeHg accumulation in rice grain

    Grant number:18H03392  2018.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

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    Authorship:Principal investigator 

    Grant amount:\17810000 ( Direct Cost: \13700000 、 Indirect Cost:\4110000 )

  • 水俣湾埋め立て地に眠るヘドロ中水銀の化学形態別分析によるリスク評価

    2018.4 - 2019.3

    科学研究費補助金  基盤研究(C)

  • ニトロソアミン測定

    2018.1 - 2018.5

    民間企業  一般受託研究 

  • Utility Validation of Alternative Method for NDMA Analysis Requiring Less Time, Cost, and Sample Volume

    2017.5 - 2018.10

    Local Government  International Collaboration 

  • 化学発光検出システムの高感度化

    2017.4 - 2021.4

    民間企業  国内共同研究 

  • 国立環境研究所POPs及び関連物質等に関する日韓共同研究(総水銀・化学形態別水銀分析業務)委託業務

    2015.8 - 2018.3

    政府機関  一般受託研究 

  • 水銀汚染を受けた水田におけるメチル水銀の生成とその生態系への影響

    Grant number:15H02832  2015 - 2017

    文部科学省  科学研究費補助金(基盤研究(B))  基盤研究(B)

    児玉谷 仁

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\9880000 ( Direct Cost: \7600000 、 Indirect Cost:\2280000 )

  • 汚染地域における水銀の環境動態と生態系への影響

    2013.4 - 2016.3

    科学研究費補助金  基盤研究(A)

  • 水銀汚染土壌および底質中のメチル水銀の簡易・迅速・高感度な分析システムの開発(環境研究総合推進費)

    2013.4 - 2015.3

    環境省  環境研究総合推進費 

    児玉谷 仁、児玉谷 仁

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    水銀汚染土壌および底質中のメチル水銀の簡易・迅速・高感度な分析システムの開発

  • 水銀汚染土壌におけるメチル水銀の生成とその周辺環境への影響評価

    2012.11 - 2015.10

    公益財団法人 鉄鋼環境基金  環境研究助成 

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    Grant type:Competitive

  • N-ニトロソジメチルアミン超高感度分析のための光化学反応器の開発

    2012.10 - 2013.9

    クリタ・水環境科学振興財団  国内研究助成 

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    Grant type:Competitive

  • 浄水処理により生成するニトロソアミン類のサブpptレベルでの動態解明

    2011.4 - 2013.3

    科学研究費補助金  若手研究(B)

  • Simple and Sensitive method for determination of methylmercury in environmental samples by high-performance liquid chromatography with chemiluminescence detection

    2011.4 - 2012.3

    その他機関  海外発表促進助成 

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    Grant type:Competitive

    Simple and Sensitive method for determination of methylmercury in environmental samples by high-performance liquid chromatography with chemiluminescence detection

  • 有機水銀の選択的高感度分析システムの開発

    2010.11 - 2012.10

    鉄鋼業環境保全技術開発基金  環境研究助成 

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    Grant type:Competitive

  • 汚染地域における水銀動態とその環境影響

    2010.4 - 2013.3

    科学研究費補助金  基盤研究(B)

  • ニトロソアミン類の高感度分析システムの開発

    2007.4 - 2009.3

    科学研究費補助金  若手研究(B)

  • イドリヤ旧水銀鉱山(スロベニア共和国)周辺地域における水銀の動態とその環境影響

    2006.4 - 2009.3

    科学研究費補助金  基盤研究(B)

  • 錯体電気化学発光検出システムの高感度化

    2006.4 - 2008.3

    科学研究費補助金  基盤研究(C)

  • ルテニウム錯体とπ電子化合物による化学発光反応の解明と分析化学的応用

    2004.4 - 2005.3

    日本科学協会  笹川科学研究助成 

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    Grant type:Competitive

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