Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (28): 153-158.doi: 10.11924/j.issn.1000-6850.casb2020-0727

Special Issue: 植物保护 水产渔业

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Influence of Chiral Difference on the Degradation of Fenvalerate in Aquaculture Sediment Environment

Song Chao1,2,3(), Zou Jianmin1,2,3, Wang Qian1,2,3, Chen Xi1,2,3, Fang Longxiang1,2,3, Qiu Liping1,2,3, Chen Jiazhang1,2,3()   

  1. 1Freshwater Fisheries Research Center of Chinese Academy of Fishery Sciences, Wuxi Jiangsu 214081
    2Laboratory of Quality & Safety Risk Assessment for Aquatic Products on Environmental Factors (Wuxi),Ministry of Agriculture and Rural Affairs, Wuxi Jiangsu 214081
    3Key Laboratory of Control of Quality and Safety for Aquatic Products, Ministry of Agriculture and Rural Affairs, Beijing 100000
  • Received:2020-11-28 Revised:2020-12-31 Online:2021-10-05 Published:2021-10-28
  • Contact: Chen Jiazhang E-mail:songc@ffrc.cn;chenjz@ffrc.cn

Abstract:

To study the dynamic degradation regulation of fenvalerate (FV) and its chiral isomers (trans-isomer: FV1 and FV2; cis-isomer: FV3 and FV4) in aquaculture sediment, the degradation regulation of FV and chiral isomers were studied through laboratory simulation. The degradation of FV in sediment followed the first-order degradation kinetics. The half-lives of FV in the sediment ranged from 19.47 to 38.73 days. There was no significant difference in the degradation half-lives of FV. Nevertheless, the half-lives of different chiral isomers in the sediment were different. The degradation half-life of FV1 was substantially longer than those of other isomers, and the degradation half-life of FV3 was significantly longer than those of FV2 and FV4. FV underwent α-C isomerization in the sediment. When the conversion was carried out for 21 d, the conversion rate was slowing down and the changes in conversion products decreased. Because FV had a long accumulation period in sediments, the direct exposure of sediment to FV should be minimized. To effectively conduct environmental and ecological risk assessments of FV, the different chiral isomers should be distinguished in sediment FV residues.

Key words: fenvalerate, sediment environment, chiral isomer, half-life, conversion

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