Experimental study on photodegradation and leaching of typical pesticides in greenhouse soil from Shouguang, Shandong Province, East China  

作　　者：Li‑Ting Hua Rui‑Lin Wu Cun‑Lu Li Chao‑Nan Wang Yi‑Long Li Fu‑Liu Xu 

机构地区：[1]MOE Laboratory for Earth Surface Processes,College of Urban and Environmental Sciences,Peking University,Beijing 100871,China [2]Department of Ecology and Environment of Shanxi Province,No.7,North Section of Binhe West Road,Taiyuan 030024,Shanxi,China

出　　处：《Ecological Processes》2024年第2期32-47,共16页生态过程(英文)

基　　金：funded by the National Key Research and Development Plan of China(2016YFD0201204);the National Natural Science Foundation of China–Shandong United Fund(U2006214)

摘　　要：Background Pesticide use contributes to national food security.The dissipation pathways and degradation mecha-nisms of pesticides have been widely studied and pesticide residues have remained a focus of public concern.How-ever,studies on the migration and transformation behaviors of pesticide residues in real-world greenhouse soils are insufficient.Therefore,in this study,we collected greenhouse soil from Shouguang,Shandong Province,and investi-gated the photodegradation and leaching of 17 common pesticides,which leave residues in the soil and are the most frequently used pesticides in Shouguang.The environmental behavior of pesticides in greenhouse soils will provide new information on pesticide residues in the real environment and provide a scientific basis for the prevention and control of pesticide pollution in greenhouse soils.Results The photodegradation of trifloxystrobin followed a first-order kinetic equation,whereas those of emamec-tin benzoate,chlorantraniliprole,buprofezin,difenoconazole,pyraclostrobin,boscalid,tebuconazole,isoprothiolane,metalaxyl,and oxadixyl followed second-order kinetics.The half-lives of 17 pesticides under light and dark conditions ranged from 2.5–104(mean:36.2)and 2.6–110(mean:31.4)days,respectively.The half-lives of emamectin benzoate,pyraclostrobin,and metalaxyl in the light were 86.6%,68.5%,and 94.5%of their half-lives in the dark,respectively.Chlorantraniliprole,metalaxyl,nitenpyram,diethofencarb,acetamiprid,carbendazim,and oxadixyl were leached to≥90%in aqueous solution.Six pesticides,avermectin B1A,emamectin benzoate,trifloxystrobin,difenoconazole,pyraclostrobin,and buprofezin,were difficult to leach from aqueous solutions.Conclusions The degradation rate of some pesticides was higher in the light environment than in the dark.The leaching potential of the leachable pesticides was nitenpyram?metalaxyl>acetamiprid>carbendazim>diethofen-carb≈chlorantraniliprole>isoprothiolane>oxadixyl>boscalid≈tebuconazole>hexaconazole.Pesticides that are easy to leach but not easi

关 键 词：PESTICIDES PHOTODEGRADATION HALF-LIFE LEACHING Vertical migration 

分 类 号：X53[环境科学与工程—环境工程]