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Residues, dissipation, and risk assessment of spinosad in cowpea under open field conditions

文献类型： 外文期刊

作者： Huan, Zhibo 1 ; Luo, Jinhui 1 ; Xu, Zhi 1 ; Xie, Defang 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Anal & Testing Ctr, Hainan Prov Key Lab Qual & Safety Trop Fruits & V, Haikou 571101, Peoples R China

关键词： Spinosad;Dissipation;Crop residues;Risk assessment;Cowpea;UPLC-MSMS

期刊名称：ENVIRONMENTAL MONITORING AND ASSESSMENT （ 影响因子：2.513； 五年影响因子：2.871 ）

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收录情况： SCI

摘要： The dissipation and residues of an eco-friendly bio-pesticide, spinosad, in cowpea under field conditions were studied using ultra-performance liquid chromatography with tandem mass spectrometry (UPLC-MSMS) after Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS) extraction. The method exhibited good linearity with respect to spinosyn A and spinosyn D in solvent or blank cowpea matrix with correlation coefficients > 0.99. Additionally, matrix effects were not significant in the range 0.987-1.014, and the average recoveries at three concentration levels were 75.1-91.1 and 79.4-90.5 % for spinosyn A and spinosyn D, respectively. The intra-and inter-day relative standard deviations were 2.5-9.3 and 7.8-9.8 % for spinosyn A, respectively, and 4.1-7.9 and 6.6-8.3 % for spinosyn D, respectively. The limits of detection (LODs) and limits of quantification (LOQs) were 0.005 and 0.01 mg kg(-1), respectively, for spinosyn A, and 0.002 and 0.005 mg kg(-1), respectively, for spinosyn D. The dissipation of spinosad (sum of spinosyn A and spinosyn D) fitted well to first-order kinetics with half-lives of 0.9-1.5 days. The highest residue (HR) at pre-harvest interval (PHI) of 12 h was 0.321 mg kg(-1). Compared with the maximum residue limit (MRL) set by Codex, a PHI of at least 24 h was recommended. The estimated daily chronic intake of spinosad from cowpea was less than 0.14 % of the acceptable daily intake (ADI). Therefore, the risk of consuming cowpea sprayed with spinosad under recommended field conditions was considered acceptable for the Chinese population.

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