Analytical method of 18 organochlorine pesticides in Ginsene

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 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 μ g/kg,the limit of quantification(LOQ) was 10 μ g/kg.