Concentration of neonicotinoid insecticides in river, lake, and tap water sourced from Lake Kasumigaura, Japan

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  • SUGINO Fumiya
    Graduate School of Frontier Sciences, The University of Tokyo
  • SATO Toshiko
    Graduate School of Frontier Sciences, The University of Tokyo
  • YAMAMURO Masumi
    Graduate School of Frontier Sciences, The University of Tokyo

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  • 霞ヶ浦の流入河川・湖水・湖水を原水とする水道水におけるネオニコチノイド系殺虫剤濃度
  • カスミガウラ ノ リュウニュウ カセン ・ コスイ ・ コスイ オ ゲンスイ ト スル スイドウスイ ニ オケル ネオニコチノイドケイ サッチュウザイ ノウド

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<p>　We examined the concentrations of neonicotinoid insecticides in lake water, inflowing river water, and tap water sourced from Lake Kasumigaura. Sampling was conducted at the shore near the Kihara water intake on the right bank of Lake Kasumigaura (Nishiura) for lake water, and the Seimei River for river water, which is the closest inflow river to the water intake. Sampling was conducted on 16 days from September 2020 to August 2021, the day after it rained more than 10 mm. Tap water samples were collected seven times in the evening on the days when lake and river water were sampled from September 2020 to March 2021. Of the seven types of neonicotinoids used in Japan, five types were detected in the Seimei River and four types in Lake Kasumigaura. Dinotefuran and clothianidin were detected year-round in both lake and river water. However, neonicotinoids were not detected in tap water during the entire period, likely due to activated carbon treatment at the water purification plant.</p>

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