蔬菜中有机氯和拟除虫菊酯农药残留量的测定

目的建立了蔬菜中8种有机氯农药和4种拟除虫菊酯农药残留气相色谱分析方法。方法样品用丙酮浸泡过夜,再用石油醚进行液液分配,提取液用弗罗里硅土柱净化,采用SE-54弹性石英毛细管柱分离,用GC-ECD同时检测。结果高、中、低3个水平添加时的回收率为87.5%~104.7%,相对标准偏差为2.2%~5.8%。该方法的检出限为:有机氯农药质量分数为5.0×10-8%~7.0×10-7%,拟除虫菊酯质量分数为5.0×10-7%~8.0×10-7%。结论可用于蔬菜中农药残留量测定。

Determination of the organochlorine and pyrethroid pesticide residues in vegetables

Objective To determine the organochlorine and pyrethroid pesticide residues in vegetables by GC.Methods Pesticide residues were extracted from vegetables with petroleum ether.Extracts were clean-up by alumina neutral-florisil column.Analytical screening was determined by gas chromatography using capillary column equipped with electron-capture detector.Results The recovery obtained from vegetable samples(n=5) at three concentration levels were in the ranges of 87.5%～104.7%,with relative standard deviations of 2.2%～5.8%.Limits of detection were 5.0×10-8% to 7.0×10-7% for organochlorines and 5.0×10-7% to 8.0×10-7% for pyrethroids,respectively.Conclusion A satisfactory result was obtained in the determination of organochlorines and pyrethroids in vegetable.