Decontamination of organochlorine pesticides inRadix Codonopsis by supercritical fluid extractions and determination by gas chromatography

A method involving depuration of 12 organochlorine pesticides (OCPs) from Radix codonopsis was developed using supercritical fluid extraction (SFE). The pesticides investigated in the study included α ‐, β ‐, γ ‐ and δ ‐benzene hexachloride, PCNB (pentachloro‐nitrobenzene), PCA (pentachloroaniline), HEPT (heptachlor), MPCPS (methyl‐pentachlorophenyl sulfide), pp ′‐DDE [1,1‐dichloro‐2, 2‐bis( p ‐chlorophenyl) ethylene], op ′‐DDT...