关键词: 豇豆, 农药, 代谢物, 超高效液相色谱-串联质谱, 膳食摄入风险评估

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．

Key words: cowpea, pesticide, metabolite, ultra performance liquid chromatography-tandem mass spectrometry（UPLC-MS/MS）, dietary intake risk assessment