改进的QuEChERS方法配合GPC-GC-MS在线联用系统测定果蔬中31种农药残留

Determination of 31 pesticide residues in fruits and vegetables using a on-line GPC-GC-MS system combined with modified QuEChERS

目的:建立果蔬中31种农药残留的快速分析方法。方法:采用改进的QuEChERS前处理方法和GPC-GC-MS在线联用系统,快速测定果蔬中有机磷、氨基甲酸酯、拟除虫菊酯、有机氯等共31种农药的残留量。结果:31种农药分离效果较好;方法检出限(S/N≥3)为0.01μg/kg^0.83μg/kg;平均回收率为72%~110%;相对标准偏差为1.6%~10%。结论:该方法具有灵敏度高、精密度好、准确度高、操作便捷、分析周期短的优点,可以满足同时测定蔬菜水果中多种农药残留的检测要求。

Objective：To establish a method for determination of 31 pesticide residues in fruits and vegetables.Methods： Modified QuEChERS pretreatment method and a on-line GPC-GC-MS system were used for the rapid determination of 31 pesticide residues including organophosphorus,organochlorine,carbamate and pyrethroid etc.Results： The 31 pesticides were well separated and the detection limits of the method were 0.01 μg/kg～0.83 μg/kg,the recoveries were 72%～110% and the relative standard deviations were 1.6%～10%.Conclusion： The good sensitivity,precision,accuracy,simple operation and short analytical period of this method could satisfy the requirement of simultaneous determination of various pesticide residues.