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• 水環境中に残留する水田施用農薬のPolar Organic Chemical Integrative Sampler（ POCIS）とグラブサンプリングによる時間加重平均濃度の比較

  須戸幹、梶原暢人、岩間憲治

   水環境学会誌  45 (2)   41 ～ 50  2022年

  共著  共同（主担当）

• Hexabromocyclododecane in riverine and estuarine sediments from Osaka, Japan: spatial distribution and concentration variability within identical samples

  Ichihara M., Yamamoto A., Kakutani N., Funasaka K., Sudo M.

  Environmental Science and Pollution Research  Environmental Science and Pollution Research  27 (28)   35782 ～ 35791  2020年10月

  10.1007/s11356-020-09856-0  共著  

  [概要]

  In this study, hexabromocyclododecane (HBCD) in riverine and estuarine sediments was investigated in Osaka, Japan. The mean total HBCD concentration detected in sediments ranged from < 0.50 to 130 ng g dry weight. This exceeded the ubiquitous HBCD contamination level found globally but was lower than that in areas affected by point sources, such as textile industries and expanded polystyrene plants. Sewage effluent was one of the suspected point sources of HBCD in the study area. The HBCD concentrations in sediments were highly dependent on certain factors, such as the location of the sampling site (proximity to possible emission sources), sediment properties (silt or sand), and organic substance content. The range of the diastereomer composition of α- and γ-HBCD was wider than that in other studies. Repeatability tests (n = 3) were conducted for all samples to assess the variability in the HBCD concentrations within identical sediment samples. Some variations were observed in the HBCD concentrations and diastereomer compositions within the repeatability test results at some sampling sites; nevertheless, the same samples were extracted and analyzed in triplicate. The bromine contents of the extracts of these samples were analyzed by X-ray fluorescence, and the results agreed well with those estimated from the LC-MS/MS results. From these results, it was confirmed that several sediment samples contained heterogeneously distributed HBCD. The risk characterization ratios (predicted environmental concentration/predicted no-effect concentration) of sites with high HBCD concentrations ranged from 0.1 to 1; thus, further information is required, and the sediment HBCD levels in this region should be continuously studied. −1

• Inhomogeneity of sediment samples in analysis of hexabromocyclododecane

  Ichihara M., Yamamoto A., Kakutani N., Takakura K., Sudo M.

  Environmental Monitoring and Assessment  Environmental Monitoring and Assessment  191 (7)    2019年07月

  10.1007/s10661-019-7553-6  共著  

  [概要]

  © 2019, Springer Nature Switzerland AG. The repeatability test of the analytical method for hexabromocyclododecane (HBCD) was conducted with sediment sample. The maximum HBCD concentration exceeded the minimum by a factor of 90 even though the identical sediment samples were used. Therefore, we examined which step of the analytical method was the factor causing variability. We examined the blank test, and confirmation test of the extraction and purified procedure. From these results, we confirmed that there was nothing wrong with the accuracy of our analytical method. These results indicate that the variability of HBCD concentration in the repeatability test was attributed not to the analytical method, but to the inhomogeneity of the sediment sample. Aluminum, silicon, and organic carbon in sediments were measured to compare the variability of these concentrations with that of HBCD concentration. These concentrations were similar values within identical samples which showed variability in HBCD concentration. HBCD concentration in several samples did not correlate with organic carbon content. These results suggests that sediment samples were homogeneous by itself, and HBCD was heterogeneously distributed in spite of homogeneity of organic carbon in sediment. The sediment sample with variability in HBCD concentration showed different HBCD diastereomer compositions in identical sediment. It implies that the sample contained HBCD derived from different histories or point sources. Even though we increased sample amounts to analyze the homogeneity of the sample, HBCD concentration varied within identical samples if the sample had a hot spot. Past monitoring data may contain overestimation or underestimation of HBCD concentration in sediment.

• 農薬の農耕地から河川への流出に関する研究

  須戸幹

   水環境学会誌  42A (11)   381 ～ 385  2019年

  単著  

• Uptake and elimination kinetics of trifluralin and pendimethalin in Pheretima spp. and Eisenia spp.

  Goto Y., Sudo M.

  Environmental Science and Pollution Research  Environmental Science and Pollution Research  25 (13)   12352 ～ 12360  2018年05月

  10.1007/s11356-018-1483-7  共著  

  [概要]

  © 2018, Springer-Verlag GmbH Germany, part of Springer Nature. The purpose of this study was to clarify the kinetic bioaccumulation potential of herbicides in the earthworm, Pheretima spp., the most common earthworms throughout Asia, and Eisenia spp., litter-feeding earthworms included in the test species recommended by the Organization for Economic Co-operation and Development. The kinetic bioaccumulation factors of trifluralin and pendimethalin were estimated from an uptake test for 10 or 12 days and from an elimination test for 10 days. The time required to reach a steady state following herbicide exposure was 7 days for both herbicides in Eisenia spp. and 1 day in Pheretima spp. The uptake rate constant (g-soil/g-worm/day) and elimination rate constant (per day) for trifluralin were 2.1 and 0.23 in Eisenia spp. and 0.42 and 0.45 in Pheretima spp., respectively, and those for pendimethalin were 1.5 and 0.26 in Eisenia spp. and 0.27 and 1.0 in Pheretima spp., respectively. Kinetic bioaccumulation factors of both herbicides were relatively close to bioaccumulation factors in steady state and were higher in Eisenia spp. (8.9 for trifluralin and 5.7 for pendimethalin) than in Pheretima spp. (0.95 and 0.26). These results demonstrated that the herbicide bioaccumulation risk is lower for Pheretima spp. than for Eisenia spp. because of the lower uptake rate and higher elimination rate in Pheretima spp.

• Herbicide discharge from rice paddy fields by surface runoffand percolation flow: A case study in paddy fields in the Lake Biwa basin, Japan

  Sudo M., Goto Y., Iwama K., Hida Y.

  Journal of Pesticide Science  Journal of Pesticide Science  43 (1)   24 ～ 32  2018年01月

  10.1584/JPESTICS.D17-061  共著  

  [概要]

  © Pesticide Science Society of Japan. The transport of three herbicides, pyriminobac-methyl, imazosulfuron and pyraclonil from a watershed that includes 40 ha of paddy fields to a drainage canal was monitored in the Lake Biwa basin, Japan. Based on the intensive monitoring of all paddy plots and in the drainage canal conducted on 3 days during and after the application period, the passage of herbicide discharge from the paddy fields to the drainage canal was separated into surface runoffobtained from field observations and percolation flow calculated from the herbicide mass balance. Surface runofffrom paddy plots immediately after herbicide application, discharging a large volume of paddy water, or both processes in conjunction had a significant effect on herbicide discharge. Without surface runoff, paddy fields discharged a consistently high amount of herbicide gradually by percolation flow. These results suggest that considerable amounts of herbicides were discharged into the drainage canal through percolation even if appropriate water management to prevent herbicide surface runoffwas practiced.

• A Bayesian approach for estimating hexabromocyclododecane (HBCD) diastereomer compositions in water using data below limit of quantification

  Ichihara M., Yamamoto A., Kakutani N., Sudo M., Takakura K.

  Environmental Science and Pollution Research  Environmental Science and Pollution Research  24 (3)   2667 ～ 2674  2017年01月

  10.1007/s11356-016-7990-5  共著  

  [概要]

  © 2016, Springer-Verlag Berlin Heidelberg. We developed a statistical model that quantitatively incorporated the stochastic fluctuations of values, which were estimated as Bayesian credible intervals (BCIs), to analyze environmental monitoring data. We used α-hexabromocyclododecane (α-HBCD) diastereomer compositions of water samples that included data points below limit of quantification. To avoid replacing “not detected (ND)” values with irrelevant values in data analysis, we substituted ND with observed values from the measurement system upon examination of the model. In our study, it was assumed that the magnitude of stochastic fluctuations of observed values in environmental samples was identical to that in iterative measurements of a standard solution at the lowest concentration. Using this model, α-HBCD diastereomer compositions could be estimated along with BCIs even for samples collected from sites where concentrations of α-HBCD were ND or near limit of quantification. The brackish areas in our study showed relatively wide ranges in composition for the 95% BCIs compared with samples from fresh water areas. In the brackish areas, concentrations of HBCD were frequently ND or near limit of quantification. Using this model, it was unnecessary to replace ND with zero or limit of quantification in data analysis, and an environmental assessment could be achieved using all of the data. Therefore, this model is considered to be a widely applicable approach in the analysis of environmental monitoring data including ND.

• 水田からの窒素、リン、COD流出負荷量能実態と課題

  治多伸介、須戸幹　他

   水環境学会誌  38 (4)   81 ～ 91  2015年

  共著  

• Distribution and pollutant load of hexabromocyclododecane (HBCD) in sewage treatment plants and water from Japanese Rivers

  Makiko Ichihara a, Atsushi Yamamoto, Koh-ichi Takakura, Naoya Kakutani, Miki Sudo

   Chemosphere  110   78 ～ 84  2014年

  単著  

• 非灌漑期の農業水路における魚類の越冬場造成の試み

  皆川明子、高木強治、須戸幹、小谷廣道、岩間憲治、金木亮一

   農業農村工学会論文集  80 (5)   445 ～ 454  2012年

  単著  

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• 「化学物質の生態リスク評価と規制－（農薬編）」，（農薬類の環境汚染と動態，湖沼，pp53-61）

  日本環境毒性学会監修，畠山成久編

  IPC社  -p  2006年04月

  単行本（学術書）  共著

• 「内湖からのメッセージ」，）内湖での農薬の動態，pp.203-210）

  西野麻知子・浜端悦治編

  サンライズ出版  -p  2005年04月

  単行本（学術書）  共著

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• 琵琶湖流入河川における水田施用除草剤の降雨時流出負荷

  第50回日本水環境学会年会  2016年03月

• 水道水源における新たな監視対象農薬に関する検討

  第50回日本水環境学会年会  2016年03月

• 琵琶湖内湖（曽根沼）における農薬の流入と流出

  第50回日本水環境学会年会  2016年03月

• 水田群および一筆水田で使用された農薬の排水路への直接流出・浸透流出

  第16回IETセミナー  2015年10月

• 新たな農薬類を対象とした水道水源などの残留実態調査

  第15回環境技術学会年次大会  2015年09月

• 琵琶湖北湖における残留農薬成分の動態解析

  第49回日本水環境学会年会講演集,pp.540  2015年03月

• 新たな農薬類を対象とした水道水源などの残留実態調査

  第49回日本水環境学会年会講演集,pp.9  2015年03月

• 降雨時における水田施用殺虫剤の流出負荷

  第49回日本水環境学会年会講演集,pp.4  2015年03月

• 水田施用除草剤の一筆水田からの浸透流出特性と農薬の物性との関係

  第32回農薬環境科学研究会シンポジウム講演集  2014年11月

• 水田施用殺虫剤・殺菌剤の河川への流出評価手法の開発と流出リスク低減対策

  平成26年度河川整備基金助成事業成果発表会概要集  2014年07月

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