气相色谱同时测定蔬菜水果及其制品中多种有机氯及拟除虫菊酯类农药残留量

Simultaneous determination of 15 kinds of organochlorines and 8 kinds of pyrethroid pesticide multiresidues in vegetable foods and products by gas chromatography

目的：建立蔬菜及其制品中15种有机氯农药和8种拟除虫菊酯类农药的残留气相色谱分析方法。方法：样品用（1＋1）的丙酮＋正己烷提取,加入2%的硫酸钠溶液用正己烷进行液液分配,提取液用硅镁吸附剂层析柱净化,采用DB-1701毛细管柱分离。结果：GC-uECD同时检测,在两个水平添加时的回收率（n=6）分别为79.8%～118.7%和85.6%～118.8%,相对标准偏差分别为2.1%～9.2%和1.8%～8.6%,该方法的检出限为有机氯农药0.001 mg/kg,联苯菊酯、甲氰菊酯和三氟氯氰菊酯为0.002 mg/kg,其余5种拟除虫菊酯类农药0.005 mg/kg。结论：本方法步骤简单,净化效果好,并具有良好的灵敏度、回收率和重现性。

Objective：To establish a method for detecting 15 kinds of organochlorines and 8 kinds of pyrethroid pesticide multiresidues in vegetable foods and products.Methods：The sample was dealed with acetone＋hexane（1＋1）,swied in with 2% Na2SO4 solution,and distributied by hexane.The solution was purified by florisil,and separated by DB-1701.Results：The recovery was（n=6） 79.8%~118.7% and 85.6%~118.7% respectively,with RSD 2.1%~9.2% and 1.8%~8.6%.The limit of organochlorine pesticed was 0.001 mg/kg.It was 0.002 mg/kg for bifenthrin,fenpropathrin,lambdacyhalothrin.It was 0.005 mg/kg for the other five kinds of pyrethroid pesticide.Conclusion：It has the advantage of simplicity,purified effect,repeatability and sensitivity.