利用气相色谱(GC)建立了茶叶中28种有机氯农药同时测定的方法。试样中农药残留在超声波振荡条件下用乙腈提取,经C18、佛罗里硅土和PSA净化,GC-电子捕获检测器(ECD)检测。此测定方法的检出限为0.001～0.015mg/kg,回收率为85.5%～110.5%,相对标准偏差为1.1%～6.7%.该方法的灵敏度、准确度和精密度均符合农药残留测定的技术要求。 A method for the simultaneous determination of 28 organochlorine pesticides in tea was established by gas chromatography (GC). Pesticide residues in the sample were extracted with acetonitrile under ultrasonic agitation, and purified by C18, Florisil and PSA, and detected by GC-ECD. The detection limit of this method was 0.001 ~ 0.015mg / kg, the recoveries were 85.5% ~ 110.5%, and the relative standard deviations were 1.1% ~ 6.7% .The sensitivity, accuracy and precision of this method were in line with the determination of pesticide residues skills requirement.