文献类型：期刊文献

英文题名：Stereoisomeric Isolation and Stereoselective Fate of Insecticide Paichongding in Flooded Paddy Soils

作者：Li, Juying[1,3];Zhang, Jianbo[1];Li, Chao[2];Wang, Wei[1];Yang, Zhen[1];Wang, Haiyan[1];Gan, Jay[3];Ye, Qingfu[1];Xu, Xiaoyong[2];Li, Zhong[2]

机构：[1]Zhejiang Univ, Inst Nucl Agr Sci, Hangzhou 310029, Zhejiang, Peoples R China;[2]E China Univ Sci & Technol, Sch Pharm, Shanghai 200237, Peoples R China;[3]Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA

年份：2013

卷号：47

期号：22

起止页码：12768

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY

收录：;EI(收录号：20134817039307);WOS:【SCI-EXPANDED(收录号:WOS:000327360600021)】；

基金：This research was financially supported by the National High Technology Research and Development Program of China (863 Program) under Grant No. 2013AA065202, the National Natural Science Foundation of China under Grant Nos. 11175155 and 21007054, the Chinese Ministry of Agriculture Foundation under Grant No. 201103007, and the Science and Technology Department of Zhejiang Province under Grant No. 2010R50033.

语种：英文

外文关键词：Mineralogy - Insecticides - Floods - Stereoselectivity - Soils

摘要：Chiral insecticide paichongding (IPP) is one of the prospective substitutes for imidacloprid used in China due to its higher activity against imidacloprid-resistant insects. However, little is known about the fate of IPP in soils, including especially the different behaviors among its stereoisomers. In this study, four stereoisomers of IPP were separated and applied in flooded soils. Kinetics of mineralization, extractable residues; and bound residues showed diastereoselectivity in IPP degradation, with enantiomers (5S,7R)-IPP (IPP-SR) and (512,75)-IPP (IPP-RS) being more readily mineralized and preferentially bound to soils than enantiomers (5R,7R)-IPP (IPP-RR) and (55,75)-IPP (IPP-SS). The overall mineralization was rather limited and did not exceed 4% of the spiked rate. Concurrent to the decreases of extractable residues, the fraction of bound residues increased with time and reached about 34% of the applied radioactivity for C-14-IPP-SR and C-14-IPP-RS as compared to about 23% for C-14-IPP-RR or C-14-IPP-SS. Soil properties such as organic matter content and pH likely contributed to the variability. Relatively rapid formation of bound residue suggests that IPP may be quickly detoxified in flooded paddy soil, decreasing the potential for off-site transport such as leaching or runoff, especially for enantiomers IPP-SR and IPP-RS.