浓缩果汁中拟除虫菊酯类农药残留检测

Detection of pyrethroid pesticide residue in conceutrate juice

目的：用TRACE GC ULTRA气相色谱仪摸索建立了浓缩果汁中甲氰菊酯、联苯菊酯、高效氯氟氰菊酯、氯菊酯、氰戊菊酯、溴氰菊酯等6种拟除虫菊酯类农药残留分析方法。方法：样品经乙腈提取,Florisil小柱净化,多级升温速率,气相色谱检测。结果：6种拟除虫菊酯类农药分离良好;当样品中添加浓度为0.5-2.0 mg/L时,回收率为84.2%-102.4%,6种菊酯类农药的最低检测限为0.0025-0.01 mg/kg。结论：方法操作简便,回收率、精密度好,灵敏度高,符合检测要求。

Objective：To establish a gas chromatographic（GC） analytical method for residues of pyrethroid pesticides of Fenpropathrin,Decamethrin,Lambda-cyhalothrin,Permethrin,Fenvalerate and Decamethrin in concentrate juice.Methods：The sample was extracted by acetonitrile,purificated by Florisil,multi-warming speed and analyzed by GC.Results：Pyrethroid pesticides were separated completely and recovery efficiency was 84.2%～102.4% when add concentration was 0.5-2.0 mg/L.The lowest determinable concentration was 0.0025～0.01 mg/kg.Conclusion：The method is simple,sensitive and precise.The detection conforms to requirement.