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National trends in pesticides in drinking water and water sources in Japan

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Title: National trends in pesticides in drinking water and water sources in Japan
Authors: Kamata, Motoyuki Browse this author
Matsui, Yoshihiko Browse this author →KAKEN DB
Asami, Mari Browse this author
Keywords: pesticide concentration
rice farming
Issue Date: 20-Nov-2020
Publisher: Elsevier
Journal Title: Science of the total environment
Volume: 744
Start Page: 140930
Publisher DOI: 10.1016/j.scitotenv.2020.140930
PMID: 32711323
Abstract: Although agricultural activities—especially paddy rice cultivation—are prominent in watersheds in Asian countries, few comprehensive studies have examined pesticide concentrations in water in these areas. Here, we report the concentrations of 162 pesticides in treated drinking water and source water (14,076 samples) in Japan, where rice cultivation is common, along with trends in sales of herbicides, fungicides, and insecticides from 1963 to 2016. Herbicides and fungicides—especially those used in rice farming were frequently detected in drinking water sources. The herbicide bromobutide, which is not listed in drinking water quality standards or guidelines except in Japan, as well as the widely used-and-detected bentazone, were frequently detected in source water (bromobutide and bentazone were detected at concentrations > 0.1 μg/L in 31.1% and 33.8% of samples, respectively). Dymron and tefuryltrione were also detected in over 10% of samples at concentrations > 0.1 μg/L. The highest observed concentration of bromobutide was 10 μg/L, and 7.5% of samples had concentrations > 1 μg/L. High concentrations were also observed for halosulfuron methyl (7.9 μg/L), pyroquilon (7.0), molinate (6.8), and metominostrobin (4.6). Some of the pesticides frequently detected in source water were not detected at all in drinking water, but the main cause of the non-detection appeared to be degradation by chlorine. From the 1970s onward, sales of herbicides and fungicides with higher acceptable daily intakes (ADIs; i.e., with lower toxicity) have increased. However, the percentage of herbicides with very low ADIs (< 10−2.5 mg kg-1 d-1) being shipped has also increased. Tefuryltrione, which was detected at normalized concentrations > 0.1 in 8% of samples, is an example of this type of herbicide. The average log-Kow of herbicides has decreased from the 1970s to the present, due to the strong trend towards the application of hydrophilic herbicides, such glyphosate. The need for increased monitoring of pesticides used in rice paddy farming is highlighted.
Rights: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松井 佳彦

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