人参中18种有机氯农药多残留分析方法

Analytical method of 18 organochlorine pesticides in Ginsene

建立了人参中18种有机氯农药及其异构体残留量的气相色谱分析方法。样品以30mL石油醚-丙酮(1∶1,体积比)为提取剂,冰浴超声提取15 min,重复2次,提取液用浓硫酸净化,采用HP-5与DB1701毛细管色谱柱双柱定性分离,气相色谱-电子捕获检测器(GC-ECD)测定。结果表明:该方法在10、50、100μg/kg 3个水平下的添加回收率除艾氏剂与苯氟磺胺在62%左右外,其余分别在75.1%～107.7%、72.1%～98.6%和71.5%～105.4%,相对标准偏差(RSD)分别为2.5%～11.3%、2.6%～12.5%和1.1%～11.2%;方法的检出限为3.14μg/kg,定量限为10μg/kg。

A gas chromatographic method for determination of 18 organochlorine pesticides in Ginsene was established.Clean up by sulfonation treatment was optimized.The procedure involves ultrasonic extraction [acetone/petroleum ether（1∶ 1）as the extract solvent],concentrated sulphuric acid as clean-up method and determination by GC-ECD.Result showed that the percentage recoveries were 75.1%-107.7%,72.1%-98.6%,71.5%-105.4%（except aldrin and dichlofluanid were 62%）,and the relative standard deviation（RSD） were 2.5%-11.3%,2.6%-12.5%,1.1%-11.2%.The limit of detection（LOD） of the method was 3.14 μg/kg,the limit of quantification（LOQ） was 10 μg/kg.