快速溶剂提取-气相色谱测定蔬菜中多种农药残留

摘要

Objective:A new medthod for the determination of organochlorines and pyrethroid pesticides(OCPs)multiresi⁃dues in Tea by ASE-GC.M ethods:Samples were extraced with thiacyclohexane-ethyl acetate(1:1),and the extracts were purifide by solid-phase extraction using florisil asThe adsorbent . Analytes were determined by gas chromatography with electron detection(GC-ECD).Results:The recoveries obtained from samples Spiked with standards at the concen⁃tration levels of 0.01、0.05、0.25mg/kg were more than 90% ,the relative standard deviations(RSD)were in the range of 0.5%-4.0%.Conclusion:The method of ASE-GC is fast,low cost and good reproduceability,can be used for determina⁃tion of organochloriness and pyrethroid pesticide multiresidues in Tea .%目的：建立一种快速溶剂提取（ASE）-气相色谱（GC）同时测定蔬菜中三氯杀螨醇（有机氯类）与多种拟除虫菊酯类农药残留的新方法。方法：样品用环已烷：乙酸乙酯（1：1，V/V）提取，提取液经florisil固相萃取柱净化后，采用气相色谱-电子捕获检测器（GC-ECD）进行检测。结果：各农药在0.01、0.05、0.25mg/kg 3个添加水平上的平均回收率在90%以上，RSD在0.5-4.0%之间。结论：该方法测定蔬菜中三氯杀螨醇与拟除虫菊酯类农药多残留，快速、溶剂用量少，重现性好，能够满足蔬菜中有机氯与拟除虫菊酯类农药残留的检测要求。