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A simple and efficient method for simultaneous gas chromatographic (GC) determination of 18 organochlorine pesticides [tecnazene, hexachlorobenzene, α-benzenehexachloride (BHC), pentachloronitrobenzene (PCNB), γ-BHC, heptachlor, aldrin, methyl pentachlorophenyl sulfide, β-BHC, δ-BHC, heptachlor epoxide, α-endosulfan,  trans -chlorodane,  cis -chlorodane,  p,p ′-dichlorodiphenyl dichloroethylene,  o,p ′-DDT,  p,p ′-DDD, and  p,p ′-DDT] in Traditional Chinese Medicine (TCM) is described. The procedure involves ultrasonic extraction and sulphuric acid treatment as the cleanup method. Detection of the sample is performed by GC-electron capture detection. A series of experiments are conducted to optimize the final pretreatment conditions [acetone-petroleum ether (1:1) as the extract solvent, ultrasonication for 15 min, three steps, concentrated sulphuric acid with 10% water for sulphuric acid treatment]. Recovery st	udies are performed at 10, 50, and 100 parts-per-billion (ppb) fortification levels of each organochlorine pesticide, except for α-endosulfan, which are 20, 100, and 200 ppb. The percentage recoveries range from 77.9% ± 6.4% to 114.0% ± 8.1% (average ± standard deviation). The simple and rapid method may be used to routinely determine organochlorine pesticides in TCM.

Multiresidue Analysis of 18 Organochlorine Pesticides in Traditional Chinese Medicine