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.