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目的:采用气相色谱法建立土壤样品中有机氯农药的检测方法。方法:土壤样品干燥过筛后,对比了旋涡振荡、超声、匀浆三种样品提取方式,采用固相萃取小柱净化,经气相色谱(ECD)检测。结果:超声提取效果优于其他两种提取方式,14种有机氯农药在0.005μg/ml～1.0μg/ml的浓度范围内线性良好(R>0.99);添加浓度在5.0μg/kg、50μg/kg水平下,14种OCPs的平均回收率范围分别为80.2%～112%、80.6%～110%,相对标准偏差范围分别为4.77%～11.3%、1.41%～8.12%,方法检出限为0.80μg/kg～1.51μg/kg。结论:该方法操作简便,灵敏度高,能够满足土壤中有机氯农药残留的检测。
Objective: To establish a method for the determination of organochlorine pesticides in soil samples by gas chromatography. Methods: After the samples were dried and sieved, the extraction methods of vortex, ultrasonic and homogenization were compared. The samples were purified by solid phase extraction cartridges and detected by gas chromatography (ECD). Results: The ultrasonic extraction was superior to the other two extraction methods. The fourteen kinds of organochlorine pesticides showed good linearity (R> 0.99) in the range of 0.005μg / ml ~ 1.0μg / ml; kg, the average recoveries of 14 OCPs ranged from 80.2% to 112% and 80.6% to 110%, respectively. The relative standard deviations ranged from 4.77% to 11.3% and 1.41% to 8.12%, respectively. The detection limit was 0.80 μg / kg to 1.51 μg / kg. Conclusion: The method is simple, sensitive and can meet the detection of organochlorine pesticide residues in soil.