Origins and Transport of Aquatic Dioxins in the Japanese Watershed: Soil Contamination, Land Use, and Soil Runoff Events

MASAKAZU KANEMATSU; YOSHIHISA SHIMIZU; KEISUKE SATO; SUEJIN KIM; TASUMA SUZUKI; BAEKSOO PARK; REIKO S AINO; MASAFUMI NAKAMURA

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Origins and Transport of Aquatic Dioxins in the Japanese Watershed: Soil Contamination, Land Use, and Soil Runoff Events

机译：日本流域水生二恶英的起源和运输：土壤污染，土地利用和土壤径流事件

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Significant dioxins accumulations in Japanese forests and paddy fields have been observed, and surface soil runoff caused by rainfall and irrigation (i.e., soil puddling in paddy fields) results in dioxins input into the aquatic environment. An extensive investigation into the origins and transport of aquatic dioxins in the Yasu watershed, Japan was conducted considering surface soil contamination level, land use, and type of soil runoff event (i.e., irrigation runoff [IR], rainfall runoff [RR], and base flow [BF]). Combined use of the chemically activated luciferase expression (CALUX) assay together with high-resolution gas chromatography and high-resolution mass spectrometry (HRGC/HRMS) efficiently enabled this study, so that origins, transport, and dynamic movement of aquatic dioxins in the watershed were revealed. The particulate organic carbon normalized particulate-dioxins WHO-toxic equivalent (TEQ) concentration predicted by the CALUX assay (S_(par)) was found to be a convenient molecular marker to indicate origins of aquatic dioxins and clearly reflect surface soil contamination level, land use, and soil runoff events. Using experimental results and theoretical modeling, the annual loading amount of dioxins at the middle reach of the river was estimated to be 0.458 mg WHO-TEQ in 2004. More than 96.6% of the annual loading amount was attributed to RR and derived almost evenly from forest and paddy fields at the study location. Because the annual loading amount at the middle reach is less than 0.5% of the total dioxins accumulated in the upper basin, dioxins runoff from the Japanese watershed will continue. This study shows that the combined use of the bioassay with HRGC/HRMS can provide new insights into dioxins transport and fate in the environment.

机译：已经观察到日本森林和稻田中大量的二恶英积累，并且由于降雨和灌溉造成的表层土壤径流（即稻田中的土壤淤泥）导致二恶英输入到水生环境中。考虑到表层土壤污染水平，土地利用和土壤径流事件的类型（即灌溉径流[IR]，降雨径流[RR]和土壤径流），对日本Yasu流域中水二恶英的来源和运输进行了广泛的调查。基本流量[BF]）。化学活化的萤光素酶表达（CALUX）分析方法与高分辨率气相色谱法和高分辨率质谱法（HRGC / HRMS）的结合使用有效地完成了这项研究，从而使分水岭中水生二恶英的来源，迁移和动态运动被揭示。发现通过CALUX分析法预测的有机碳归一化颗粒二恶英颗粒物的二恶英等效浓度（TEQ）（S_（par））是指示水生二恶英起源并清楚反映地表土壤污染水平的便捷分子标记使用和土壤径流事件。根据实验结果和理论模型，2004年河流中游地区二恶英的年负荷量估计为0.458 mg WHO-TEQ。年负荷量的96.6％归因于RR，几乎均来自于研究地点的森林和稻田。由于中游地区的年负荷量不到上流域累积的二恶英总量的0.5％，因此日本流域的二恶英径流将继续。这项研究表明，将生物测定与HRGC / HRMS结合使用可以为环境中二恶英的运输和命运提供新的见解。

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《Environmental Science & Technology》 |2009年第12期|4260-4266|共7页
作者
MASAKAZU KANEMATSU; YOSHIHISA SHIMIZU; KEISUKE SATO; SUEJIN KIM; TASUMA SUZUKI; BAEKSOO PARK; REIKO S AINO; MASAFUMI NAKAMURA;
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作者单位

Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan Department of Civil and Environmental Engineering, University of California at Davis, One Shields Avenue, Davis, California 95616;

Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan;

Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan;

Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan;

Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan;

Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan;

Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan;

Hiyoshi Ecological Service Co., 908 Kitanosyo, Omihachiman, Shiga 523-0806, Japan;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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Origins and Transport of Aquatic Dioxins in the Japanese Watershed: Soil Contamination, Land Use, and Soil Runoff Events

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