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目的:应用毛细管柱气相色谱法测定蔬菜中三氯杀螨醇和4种拟除虫菊酯类农药残留量。方法:样品经乙腈提取和氯化钠盐析分层,再经硅镁柱净化,氮气流吹干后正己烷溶解定容,采用DB-1701毛细管柱分离,ECD检测,外标法定量。结果:平均加标回收率为80%～110.1%,相对标准偏差为1.3%～4.6%,检出限为0.12μg/kg～2.6μg/kg。结论:该方法准确、灵敏、可靠,适用于批量蔬菜样品的分析。
OBJECTIVE: To determine the residues of dicofol and pyrethroid pesticides in vegetables by capillary gas chromatography. Methods: The samples were separated by acetonitrile extraction and sodium chloride salting-out, and purified by silica gel column. The n-hexane was dissolved and purified by nitrogen flow drying. The samples were separated by DB-1701 capillary column, detected by ECD and quantified by external standard method. Results: The average recoveries ranged from 80% to 110.1%. The relative standard deviations were 1.3% -4.6%. The detection limits were 0.12μg / kg ~ 2.6μg / kg. Conclusion: The method is accurate, sensitive and reliable and is suitable for the analysis of batch vegetable samples.