【摘要】 本文建立了以QuEChERS为前处理,利用液质联用质谱检测莴笋和油麦菜中灭蝇胺残留的分析方法。在0.05～20 mg/kg添加水平下,灭蝇胺在莴笋和油麦菜中的平均回收率为90%～104%,相对标准偏差为1%～11%。应用该方法对莴笋和油麦菜中灭蝇胺的残留量进行了研究,试验结果表明,灭蝇胺在山东和浙江两地莴笋和油麦菜中半衰期为分别为6.9～7.7 d和6.1～9.6 d。按照有效成分168.75 g/hm2和253.125 g/hm2的用量,喷雾施药2～3次,施药间隔7 d,距末次施药后间隔3 d采样,测得莴笋叶、莴笋茎和油麦菜中灭蝇胺的残留中值分别为3.92、0.187、4.67 mg/kg。以此为基础对灭蝇胺进行长期膳食摄入风险评估。结果表明,灭蝇胺在所有登记作物中的总膳食摄入风险商为0.162,膳食风险在可接受范围。更多还原

【Abstract】 An analytical method for the determination of cyromazine residues in celtuce and cos lettuce was established using high-performance liquid chromatography-tandem mass spectrometry(LC-MS/MS) after QuEChERS extraction. The recovery rates of cyromazine in celtuce and cos lettuce ranged from 90% to 104%. The relative standard deviations(RSDs)ranged from 1% to 11%. The method was applied to determine the residues of cyromazine in celtuce and cos lettuce. The half-lives of cyromazine in celtuce and cos lettuce were 6.9-7.7 d and 6.1-9.6 d. The ultimate residues of cyromazine in celtuce and cos lettuce were determined after the application at effective olosage of 168.75 g/hm2 and 253.125 g/hm2 for 2-3 times usage with application frequency of 7 d, in celtuce and cos lettuce 3 d after treatment. The median residue levels were3.92 mg/kg, 0.187 mg/kg, 4.67 mg/kg, in celtuce, celtuce stem and cos lettuce, respectively. The total risk quotient(RQ)values for cyromazine in all registered crops were 0.162, which were lower than RQ=1. Based on this analysis, dietary risk of cyromazine is within acceptable levels.更多还原