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| Pollution investigation and ecological risk assessment of pyrethroid insecticides in Tongji River from Zhenjiang |
| Received:December 25, 2024 |
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| KeyWord:Taihu Lake;Tongji River;surface water;pyrethroids;pesticides;ecological risk assessment |
| Author Name | Affiliation | E-mail | | ZHANG Qinwen | School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212000 China | | | CHEN Xiangyu | School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212000 China | | | LIANG Yihui | School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212000 China | | | CHEN Yao | School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212000 China | | | WANG Chunliu | School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212000 China | | | WU Xiangyang | School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212000 China | wuxy@ujs.edu.cn |
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| Abstract: |
| In order to explore the current pollution status and ecological risk of pyrethroid insecticides in Tongji River, one of the rivers entering Taihu Lake in Zhenjiang City, this study collected water samples from Tongji River and its tributaries in June and December 2023. The pyrethroid insecticides in the water samples were determined according to the HJ 753—2015, and the analysis of the characteristics of the spatial and temporal distributions and the assessment of the ecological risks were also carried out. The results showed that 7 pyrethroid pesticides were detected in the water bodies during the 2 sampling periods. To be specific, 5 pyrethroids were detected in the wet season, namely fenvalerate, beta-cypermethrin, deltamethrin, lambda-cyhalothrin and permethrin, with the total amount of detected pesticides ranging from ND to 0.405 μg·L-1. 7 pyrethroids were detected in the dry season, respectively permethrin, beta-cypermethrin, fenvalerate, deltamethrin, lambda-cyhalothrin, fenpropathrin and bifenthrin, with the total amount of detected pesticides ranging from ND to 0.475 μg·L-1. The spatial and temporal distribution characteristics showed that the detection rate of pyrethroid insecticides was higher in water bodies in agricultural and residential concentration areas, and the detection rate in the dry season was higher than that in the wet season. The ecological risk assessment showed that pyrethroids pose a potential ecological risk to crustaceans, fish and algae in both dry and abundant water, and that the ecological risk to crustaceans and fish is much higher than that to algae. Among them, beta-cypermethrin plays an important role in the ecological risk of algae, Daphnia magna and fish. The study showed that the distribution of pyrethroid pesticides in the Tongji River and its tributaries showed obvious temporal and spatial characteristics, and the residues of these pesticides posed a certain ecological risk to aquatic organisms. |
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