吡唑醚菌酯在冬枣中的残留消解及膳食风险评估  

Residue degradation and dietary risk assessment of pyraclostrobin in winter jujube

作　　者：陈勇达[1] 张嘉坤 李丽梅[1] 郑振山[1] 钱训[1] CHEN Yongda;ZHANG Jiakun;LI Limei;ZHENG Zhenshan;QIAN Xun(Institute of Biotechnology and Food Science,Hebei Academy of Agriculture and Forestry Sciences,Shijiazhuang050051,China)

机构地区：[1]河北省农林科学院生物技术与食品科学研究所,石家庄050051

出　　处：《现代农药》2024年第4期50-54,共5页MODERN AGROCHEMICALS

基　　金：河北省重点研发计划项目(21326803D)。

摘　　要：2021—2022年在河北黄骅开展了250 g/L吡唑醚菌酯乳油在冬枣中的规范残留田间试验,样品采用QuEChERS法净化,气相色谱-电子捕获检测器检测分析,得出吡唑醚菌酯在冬枣中的残留消解规律,并对其进行膳食风险评估。2年残留消解试验结果显示,吡唑醚菌酯在冬枣中的半衰期分别为9.86、11.8 d,消解规律符合一级动力学方程;最终残留试验结果显示,末次药后14~28 d,吡唑醚菌酯残留量为0.297~0.684 mg/kg,其中,末次药后21 d的残留试验中值为0.432 mg/kg。膳食风险评估得出风险商为0.62%,膳食摄入风险可接受。建议250 g/L吡唑醚菌酯乳油在冬枣上使用剂量为3000~4000倍液,每季最多施药3次,施药间隔期7 d,安全间隔期21 d。The standardized residual field trials of pyraclostrobin 250 g/L EC in winter jujube were carried out in Huanghua,in 2021-2022.The samples were extracted and purified by QuEChERS,and detected by GC-ECD.Then the residue degradation rule of pyraclostrobin in winter jujube was obtained,and the dietary risk assessment was conducted.The residue degradation tests showed that the half-lives of pyraclostrobin in winter jujube were 9.86 d,11.80 d,and the degradation dynamics accorded with the first-order reaction dynamic equations.The final residues were 0.297-0.684 mg/kg,at the 14-28 d after the last dose.The STMR of the 21 d was 0.432 mg/kg and the risk quotient was 0.62%,the dietary risk of pyraclostrobin was acceptable.It was suggested that pyraclostrobin 250 g/L EC was used in winter jujube with a dose of 3000-4000 times,the maximum application time was 3,the application interval was 7 d,and the pre-harvest interval was 21 d.

关 键 词：吡唑醚菌酯 冬枣 残留量 消解规律 安全间隔期 风险评估 

分 类 号：TQ450.26[化学工程—农药化工]