[Application of gas chromatography-mass spectrometry for determination of the organochlorine pesticide residues in ginseng].

A gas chromatographic-electronionization-mass spectrometric method (GC-EIMS) was developed for the determination of organochlorine pesticide residues in Ginseng plants. The Ginseng samples were extracted with acetone, partioned using petroleum ester with sodium chloride saturated aqueous solution and clean-up with concentrated sulfuric acid. The organochlorine pesticide residues were analysed by GC-MS with monitoring selective mass ions. Ten organochlorine pesticides including alpha, beta, gamma and delta isomers of hexachlorocyclohexane (HCH), pp'-DDE, pp'-DDT, op'-DDT, pp'-DDT, pentachloronitrobenzene (Quintozene, PCNB), and hexachlorobenzene(HCB), were determined simultaneously. Targeted pesticide analytes were separated on DB-5 capillary column. The optimum chromatographic conditions and MS parameters were determined. The average recovery rates for those pesticide residues Ginseng were from 76.6% to 90.1% at 0.1 mg/kg of spiked level, except 58.3% for PCNB. The relative standard deviations were 9.3%-15.0%.