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| Determination of Residual Quantity from Five Pesticides and Their Metabolites in Cowpea and Dietary Risk Assessment |
| ZHANG Qun，DUAN Yun，MA Chen，TIAN Hai，HUAN Zhibo，WU Xiaopeng |
| Analysis and Testing Center，Chinese Academy of Tropical Agricultural Sciences，Key Laboratory of Quality and Safety Control for Subtropical Fruit and Vegetable，Ministry of Agriculture and Rural Affairs，Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruit and Vegetable Products，Laboratory of Quality and Safety Risk Assessment for Tropical Products（Haikou），Ministry of Agriculture and Rural Affairs，Haikou 571101，Hainan，China |
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Abstract QuEChERS method was adopted to conduct sample pretreatment．Through optimizing chromatography and mass spectrometric condition，a QuEChERS method combined with ultra performance liquid chromatography-tandem mass spectrometry（UPLC-MS/MS）was established to rapidly test the residues of 5 pesticides and their metabolites in cowpea samples．This method was used to detect 238 commercially available cowpea samples in Hainan Province from November 2020 to February 2021．The health risks of these pesticide residues were also evaluated．The results showed that the quantification limits of aldicarb and its metabolites was 0.010 mg · kg-1．The quantification limits of the rest 4 pesticides and their metabolites was 0.005 mg · kg-1．Two pesticides and one metabolite were detected from samples．Detection rate of cyromazine was 44.5%．That of carbendazim was 22.3%．That of melamine was 0.8%．Dietary intake risk assessment was conducted on these 2 detected pesticides．The result showed that the risk of acute dietary intake of pesticides was 0.375 8%-29.126 6%，and risk of chronic dietary intake of pesticides was 0.057 6%-0.131 4%．Their value-at-risk were far less than 100%，indicating their risks were within the accepted range．It means that probability of threatening dietary safety of consumer through pesticide residues intake from cowpea was lower．
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Received: 07 March 2022
Published: 24 June 2022
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