Determination of thiamethoxam and its metabolite clothianidin residue and dissipation in cowpea by QuEChERS combining with ultrahigh-performance liquid chromatography-tandem mass spectrometry

文献类型： 外文期刊

第一作者： Chen, Li

作者： Chen, Li;Jia, Chunhong;Yu, Pingzhong;Zhao, Ercheng;He, Min;Jing, Junjie;Li, Fugen

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关键词： Cowpea; Pesticide; Thiamethoxam; Clothianidin; Residue

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

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收录情况： SCI

摘要： The dissipation and residue levels of thiamethoxam and its metabolite clothianidin in cowpea were investigated under field conditions. Samples of cowpea were analyzed using a QuEChERS technique with ultra-performance liquid chromatography tandem mass spectrometry. The recoveries were 86.5-118.9% for thiamethoxam and 75.6-104.1% for clothianidin, with the coefficient of variation of < 13%. The water dispersible granule formulation of thiamethoxam was applied on cowpea at 30 and 45 g active ingredient ha(-1)in accordance with good agricultural practice. The half-life of thiamethoxam in cowpea was 0.8-1.6 days. The cowpea samples were gathered at 3, 7, and 10 days after the last application, and the residues of thiamethoxam in cowpea were < 0.005-0.054 mg kg(-1), while those of clothianidin were < 0.005-0.008 mg kg(-1). The final residues of thiamethoxam and clothianidin were below the European Union (EU) maximum residue level (0.3 mg kg(-1)for thiamethoxam; 0.2 mg kg(-1)for clothianidin) in cowpea after a preharvest interval (PHI) of 7 days. This study provided basic data on the use and safety of thiamethoxam and clothianidin in cowpea to help the Chinese government formulate a maximum residue level for thiamethoxam in cowpea.

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