Duan Jinsheng, Gao Beibei, Dong Xu, Sun Mingna, Shen Yang, Zhang Zhaoxian, Gao Tongchun, Wang Minghua
Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application Nanjing Jiangsu 210095 China
Institute of Plant Protection and Agro-Products Safety, Anhui Academy of Agricultural Sciences, Key Laboratory of Agro-Product Safety Risk Evaluation (Hefei) Hefei 230031 China.
RSC Adv. 2018 Oct 22;8(63):35897-35902. doi: 10.1039/c8ra04873h.
The stereoselective environmental behaviour of carfentrazone-ethyl and its metabolite carfentrazone enantiomer in three types of soil were studied under aerobic conditions. Under aerobic conditions, significant stereoselective difference in the degradation behaviour of carfentrazone-ethyl and its metabolite carfentrazone enantiomer was observed in Jiangxi red soil, Jilin black soil and Anhui paddy soil. The EF values of the carfentrazone-ethyl enantiomers in Anhui paddy soil, Jilin black soil, and Jiangxi red soil were 0.67, 0.65 and 0.57, respectively. The EF values of the carfentrazone enantiomer in the three types of soil were 0.75, 0.80 and 0.76. No bidirectional chiral inversion of enantiopure carfentrazone-ethyl and carfentrazone enantiomers was observed in Jilin soil. As a result, -(+)-carfentrazone-ethyl and -(+)-carfentrazone in soil would be preferentially degraded, while -(-)-carfentrazone-ethyl and -(-)-carfentrazone were enriched. The results found in this paper could provide more scientific guidance for the risk assessments of carfentrazone-ethyl from a chiral perspective.
在好氧条件下，研究了精恶唑禾草灵及其代谢产物精恶唑禾草灵对映体在三种土壤中的立体选择性环境行为。在好氧条件下，在江西红壤、吉林黑土和安徽水稻土中观察到精恶唑禾草灵及其代谢产物精恶唑禾草灵对映体降解行为存在显著的立体选择性差异。安徽水稻土、吉林黑土和江西红壤中精恶唑禾草灵对映体的EF值分别为0.67、0.65和0.57。三种土壤中精恶唑禾草灵对映体的EF值分别为0.75、0.80和0.76。在吉林土壤中未观察到对映体纯的精恶唑禾草灵和精恶唑禾草灵对映体的双向手性反转。因此，土壤中的-(+)-精恶唑禾草灵和-(+)-精恶唑禾草灵将优先降解，而-(-)-精恶唑禾草灵和-(-)-精恶唑禾草灵则会富集。本文的研究结果可为从手性角度对精恶唑禾草灵进行风险评估提供更科学的指导。
