記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Environmental Monitoring and Assessment  

© 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.

DOI： 10.1007/s10661-019-7553-6

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Environmental Science and Pollution Research  

© 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.

DOI： 10.1007/s11356-018-1483-7

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85042069571&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Verlag  

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.

DOI： 10.1007/s11356-018-1483-7

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Pesticide Science  

© 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.

DOI： 10.1584/JPESTICS.D17-061

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85051069749&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Pesticide Science  

© 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.

DOI： 10.1584/jpestics.D17-061

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Environmental Science and Pollution Research  

© 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.

DOI： 10.1007/s11356-016-7990-5

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84994417380&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：SPRINGER 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 alpha-hexabromocyclododecane (alpha-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, alpha-HBCD diastereomer compositions could be estimated along with BCIs even for samples collected from sites where concentrations of alpha-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.

DOI： 10.1007/s11356-016-7990-5

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：SPRINGER 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 alpha-hexabromocyclododecane (alpha-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, alpha-HBCD diastereomer compositions could be estimated along with BCIs even for samples collected from sites where concentrations of alpha-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.

DOI： 10.1007/s11356-016-7990-5

Web of Science

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Japan Society on Water Environment  

水田からの窒素，リン，CODの流出負荷量は，閉鎖性水域の環境改善計画や環境研究に活用される重要な基礎数値であり，より多くの信頼性の高いデータが求められている。本総説では，1980年以降の文献から作成した「日本の水田からの流出負荷量データベース（72文献，467データ）」の内容を解説し，日本の水田からの汚濁物排出原単位に関する現状と課題をまとめた。例えば，調査研究面では，灌漑期の調査と，改善農法の効果検証は進んでいる一方で，非灌漑期のデータや，改善農法の種別データが不足しており，これらを充実させることが重要である。さらに，非灌漑期における改善農法の効果検証や新たな負荷削減対策の検討が必要である。行政面では，第７次水質総量削減計画で利用されている原単位は，リンとCODを過小評価している可能性が高く，見直しが望まれる。また，その見直しの際や，各地の環境計画には，今回のデータベースの平均値，25％値，75％値は参考となる。また，慣行農法では，経年的な施肥量減少に伴い原単位が低下しているため，最近のデータを利用することが重要である。海外では，水田原単位のデータは未だ充実していない。他国に対しては，日本の原単位や，改善農法の効果を，今回のデータベースを基にして示すことで，環境改善方針の策定などに大きく寄与できると考えられる。このデータベースはWebで公開されており，行政や研究への今後の幅広い貢献が期待される。

DOI： 10.2965/jswe.38.81

CiNii Books

その他リンク： https://jlc.jst.go.jp/DN/JLC/20012936012?from=CiNii

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD  

Hexabromocyclododecane diastereoisomers (alpha-, beta-, gamma-, delta-, and epsilon-HBCD) were investigated in river water, sewage influent, and sewage effluent from the Yodo River basin, Japan. The mean annual values of HBCDs ranged from 0.19 to 14 ng L-1 in river water. We observed that the concentrations of HBCDs in the brackish water area were low compared with that in the fresh water area. It was implied that, when the flow of the river stagnated in the estuarine area, HBCDs settled with suspended matter because of their hydrophobic character. In the sewage treatment plants, HBCDs ranged from 16 to 400 ng L-1 in sewage influent, whereas they ranged from 0.39 to 12 ng L-1 in sewage effluent. Over 90% of HBCDs were removed from the wastewater in the sewage treatment plants. By using these results, we estimated the pollutant load of HBCDs that flows into Osaka Bay from the study area. It was estimated that approximately 15 kg of HBCDs flow into Osaka Bay from the study area in a year. This value is five orders of magnitude lower than the 2010 market demand for HBCDs (3019 metric tons) in Japan. (C) 2014 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.chemosphere.2014.03.074

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Japanese Society of Irrigation, Drainage and Rural Engineering  

農業水路に魚類の越冬のための深みを造成し，深み造成前後で物理環境条件および魚類相を比較した．調査を行った3地点のうち1地点は2008年から深みが存在していた．残る2地点のうち1地点には堰上げにより30cmの深みを1か所，他の1地点には掘削により水深60cmの深みを2か所新設し，後者では一方を「カバー有」，もう一方を「カバー無」とした．また，採捕個体には調査の時期と深みによって異なる標識を付け，越冬個体の移動について調査した．その結果，越冬期である12月および越冬後の3月には，深みを造成した地点では深み造成後に種数，生息密度，多様度指数の増加が見られた．また，「カバー無」と比べて「カバー有」の深みで生息密度が高くなり，標識個体のうち深み間を移動したものは全て「カバー無」から「カバー有」の深みへの移動であり，魚類の越冬に対してカバーが有効と考えられた．

DOI： 10.11408/jsidre.80.445

CiNii Books

その他リンク： https://jlc.jst.go.jp/DN/JALC/10024829990?from=CiNii

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PESTICIDE SCI SOC JAPAN  

The fate and transport of pretilachlor, one of the most widely used rice-paddy herbicides in Japan, were monitored in a rice paddy plot for 28 days after its application in the five study years. The effect of the percolation rate on herbicide loss was investigated. The concentration of pretilachlor in the paddy water was at its highest level within 2 days of application. The maximum concentration in percolated water was lower, and it was reached 1 or 2 days later than that in the paddy water. Almost all the pretilachlor loss was caused by percolation. The pretilachlor loss, as estimated from the amount that was applied and the cumulative percolation loss, ranged from 7.4 to 16.3%. In the five study years, the average percolation rate for the 7 days following application ranged from 11.5 to 29.3 mm/day. The pretilachlor loss increased proportionally with the percolation rate for 7 days following application. (c) Pesticide Science Society of Japan

DOI： 10.1584/jpestics.D11-032

Web of Science

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本環境動物昆虫学会  

CiNii Books

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Japanese Society of Irrigation, Drainage and Rural Engineering  

河川の表層水に残留した農薬が伏流で受ける影響を明らかにするため，2005年5～6月に琵琶湖流入河川のうち伏流が見られた野洲川で3回，伏流しなかった日野川で2回，農薬の濃度と負荷量を測定した．支川からの流入がない区画における最上流地点と琵琶湖の背水の影響を受けない河口地点の農薬濃度を比較すると，日野川では濃度の変動は見られなかったが，野洲川では表層水の一部が伏流した調査日で1/3程度，完全に伏流した調査日で1/100以下に減少した．これは，伏流水が周囲の浅層地下水や琵琶湖の背水による希釈・拡散の作用を受けたためと考えられた．農薬の表層水による流達率は，日野川でほぼ1.0，野洲川では0.01～0.1以下であった．

DOI： 10.11408/jsidre.79.375

CiNii Books

その他リンク： https://jlc.jst.go.jp/DN/JALC/10010471134?from=CiNii

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

育苗箱全量施肥法による減肥および無代かき栽培法が，水田の表面流出負荷，浸透流出負荷，水質浄化量，物質収支に及ぼす影響を，水田4筆を用いて，4年間に亘って検討した．<BR>その結果，育苗箱全量施肥による流出負荷削減効果は表面流出負荷については窒素とリンに大きく表れ，削減率は各々64 ％と51 ％に上った．浸透流出負荷に対する削減率は窒素26 ％，リン23 ％であった．一方，無代かき栽培の流出負荷削減効果は表面流出負荷についてのみ表われ，その削減率はSSで71 ％，CODで59 ％となり，窒素，リンについても41 ％と48 ％に上った．浄化量に対しては無代かき栽培の効果が大きく，SS，COD，リンで代かき栽培との間に有意な差を示し，窒素では代かきの有無と施肥方法との交互作用が有意な差を示した．物質収支の面からは窒素・リン肥料分が供給超過となっており，より一層の減肥が可能であることが示唆された．

DOI： 10.3178/jjshwr.23.216

CiNii Books

その他リンク： https://jlc.jst.go.jp/DN/JALC/00351090118?from=CiNii

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本農業土木学会   参加形態：共同（主担当）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本農業土木学会  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本水環境学会   参加形態：共同（副担当）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－   参加形態：共同（主担当）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本水環境学会  

The concentrations and loadings of herbicides were investigated in paddy fields (40.5ha) located around Lake Biwa from May to October in 2005 and 2006. The herbicide losses from the basin determined from the cumulative load from May to July and the application amount determined by the questionnaire method by Japan Agricultural Cooperatives (JA) were estimated in 2005 and 2006, respectively, to be 26.3% and 36.5% for Daimuron, 24.5% and 30.8% for Bomobutide, 21.5% and 18.6% for Simetryn, 15.7% and 9.30% for Benfresate, 9.14% and 11.3% for Pretilachlor, 5.49% and 5.33% for Mefenacet, and 0.32% and 0.84% for Esprocarb, and in 2005 to be 5.52% for Thenylchlor and 4.74% for Cafenstrol. A Simple model was developed to estimate herbicide losses by multiple regression analysis. The specific loss, which is calculated from the total loss and the average discharge on nonrainy days, was used as the criterion variable. The water solubility, Henry's law constant and soil adsorption constant were used as explanatory variables. The most important contributor to herbicide losses is the adsorption constant of soil. The specific losses calculated from the result of multiple regression analysis were consistent with the observed values. The errors between the observed and calculated values were within ± 0.5% for four herbicides and almost ± 1.0% for five herbicides.

DOI： 10.2965/jswe.31.375

CiNii Books

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記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本陸水学会   参加形態：共同（副担当）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本陸水学会  

DOI： 10.3739/rikusui.68.403

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：TAYLOR & FRANCIS LTD  

In order to find an alleviation method for the adverse effect of environmental endocrine disrupters, we studied the effects of the putative endocrine disrupter and peroxisome proliferator, di(2-ethylhexyl)phthalate (DEHP), on animal growth and vitamin metabolism. It is known that the effects of chemical compounds such as xenobiotics differ according to the dietary protein source. We compared the effects of dietary DEHP administration on rats fed with a diet containing milk casein or wheat gluten. The increased conversion ratio of tryptophan to nicotinamide by DEHP administration was significantly higher in the casein group than in the gluten group. We also investigated the effects of DEHP on the urinary excretion of other vitamins. DEHP administration resulted in decreased urinary excretion of vitamin B-1, vitamin B-2, and pantothenic acid.

DOI： 10.1271/bbb.50618

Web of Science

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本水環境学会   参加形態：共同（主担当）  

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－   参加形態：共同（主担当）  

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－   参加形態：共同（副担当）  

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－   参加形態：共同（副担当）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－   参加形態：共同（副担当）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：日本水環境学会  

The concentrations and loadings of herbicides were investigated in three paddy field basins (4.7, 4.7 and 9.3 ha) from May to August 2002. The herbicide losses from the basins determined from cumulative load and application amount gathered by the questionnaire method were estimated to be 1.6% and 26% for Bromobutide, 8.9∼27% for Cafenstrol, 0.1% for Dimepiperate, 1.1∼2.0% for Mefenacet, 10.2∼25% for Simetryn, 0.9% and 14% for Thenylchlor, and 0.1∼1.6% for Thiobencarb. One of the important factors attributed to the differences in herbicide loss among the basins was water discharge from the basins. To generalize them, specific herbicide losses were calculated from herbicide losses and the height of daily dry weather flow. The specific herbicide losses suggested that transport with percolated water is the main factor for Cafenstrol and Simetryn losses, although other factors such as interaction with soil and degradation in soil may have also contribute to Bromotutide, Mefenacet, Thenylchlor and Thiobencarb losses from the paddy field basins.

DOI： 10.2965/jswe.29.715

CiNii Books

その他リンク： https://jlc.jst.go.jp/DN/JALC/00288086338?from=CiNii

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－  

育苗箱全量施肥・施肥田植機を活用した減肥料栽培および無代かき栽培による，窒素・リンの表面流出負荷・浸透負荷の削減の可能性，水稲の収量・食味に及ぼす影響について2年間に亘って検討した．田面水中の窒素・リン濃度は，代かき田植期には代かき区の方が無代かき区よりも高く，普通期には標準施肥区の方が減肥区よりも高くなり、浸透水質は標準施肥区の方が減肥区よりも高濃度となった．表面流出負荷量には代かきと施肥量の2つの要因に関して高度な有意差を生じ、代かき田植期には代かき区で，普通期には標準施肥区で大きな流出負荷を観測した．浸透負荷についても無代かきおよび減肥による削減効果が見られた．

DOI： 10.3178/jjshwr.19.360

CiNii Books

その他リンク： https://jlc.jst.go.jp/DN/JALC/00284176866?from=CiNii

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：I W A PUBLISHING  

The atmospheric depositions were collected by ordinary bulk-samplers mounted with a glass or polyethylene funnel of 30cm orifice. A long-term observation was carried out at a site (35 degrees 01'30"N, 135 degrees 58'07"E) in the urbanized area for 21 years since 1974. The annual volume-weighted average concentrations of total nitrogen (TN) and phosphorus (TP) were 1.02 +/- 0.30 and 0.031 +/- 0.015 mg1(-1), respectively, and the loading rates were 14.5 +/- 2.8 and 0.43 +/- 0.16 kg ha(-1) yr(-1). The rates neither had a relationship with the precipitation (1,492 343 mm yr(-1)) nor showed any diachronic tendencies. In order to obtain the loading rate of TN and TP within 10% uncertainty under the significant level of 0.01, there is no way but to continue the observation for seven and eleven years or more, respectively. In order to clarify the regional variation of the loading amounts of the depositions, the samplers were set at 12 sites distributing throughout the Kinki District for two years. The distance from northernmost (2322 mm yr(-1)) to southernmost (11242 mm yr(-1)) is about 150 km. The average loading rates of the 12 sites were 16.2 +/- 2.5 kg ha(-1) yr(-1) of TN and 0.730 +/- 0.247 kg ha(-1)yr(-1) of TP. The depositions of NO3-N, NH4-N, and TN as well as TP showed tendencies with distances neither from a big city nor from Japan Sea.

DOI： 10.2166/wst.2006.038

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：I W A PUBLISHING  

The contamination levels and changes in the concentrations in four lagoons around Lake Biwa of paddy-use herbicide were studied. Four lagoons, Sone-numa (52 days of HIRT (hydraulic residence time) estimated from the lagoon volume and the average discharge at the outlet, 21 ha area), Yanagihira-ko (40 days, 5.0 ha), Noda-numa (11 days, 6.0 ha), and lba-naiko (2 days, 55.5 ha), were selected as monitoring sites. Intensive water sampling was carried out once a week from May to June at the outlet of each lagoon. Although twelve of the monitored herbicides were detected, the maximum concentrations did not exceed the guidelines for water-supply law in Japan. The relation between half-lives in herbicide concentrations and characteristics of a lagoon such as HRT and chlorophyll-a concentrations were examined. The shorter half-lives of herbicide concentrations in lagoons with shorter HRT means that replacement by influent water effectively decreased the pesticide concentrations. Shorter half-lives in lagoons with high chlorophyll-a concentrations between the lagoons with similar HIRT suggest that biological degradation during the residence time worked more efficiently in the lagoon with high chlorophyll-a concentrations.

DOI： 10.2166/wst.2006.046

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Japanese Society of Limnology  

This study estimated the inputs of four paddy herbicides in the entire river inflow reaching Lake Biwa, the largest lake in Japan, which serves as a water resource for 14 million people. The Uso River and the Hino River, the main contaminated rivers among the inflow rivers, were selected as daily and hourly monitoring sites to provide data on the seasonal trends in the concentration and load of herbicides and to determine the effect of rainfall events on load. The monitoring was also performed four times in 15 inflow rivers. The total input to the lake was calculated from the loads during fine weather conditions and additional loads during rainfall events. The former based on the lumped load from the two rivers and by prorating for the 15 rivers, and the latter was estimated from the relation between precipitation and increased load rate. The annual losses of herbicide from the basin to Lake Biwa were estimated to be 14.5% for bromobutide, 3.0% for pretilachlor, 5.2% for molinate, and 8.8% for simetryn. The loads caused by rainfall events accounted for 9%-18% of the total annual loads. © The Japanese Society of Limnology 2005.

DOI： 10.1007/s10201-005-0145-x

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Japanese Society of Limnology   参加形態：共同（主担当）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－  

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：－  

開催地：松山市  

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