Multi-residue Analysis of 18 Organochlorine Pesticides in 10 Traditional Chinese Medicines by Gas Chromatography (GC)

概要

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A rapid and simple method for the simultaneous analysis of 18 pesticides (α-(C_6H_6Cl_6)-Benzene hexachloride, β-BHC, γ-BHC, δ-BHC, heptachlor, heptachlor epoxide, tecnazene, pentachloronitrobenzene (PCNB), hexachlorobenzene, aldrin, methyl pentachlorophenyl sulphide (MPCPS), α-endosulfan, trans-chlorodane, cis-chlorodane, p,p'-(C_<14>H_8Cl_4)-Dichlorodiphenyl dichloroethylene, o,p'-(C_<14>H_9Cl_5)-Dichlorodiphenyl trichloroethane, p,p'-(C_<14>H_<10>Cl_4)-Dichlorodiphenyl dichloeoethane, p,p'-DDT) by gas chromatography (GC) in 10 Traditional Chinese Medicines (TCMs) has been developed. The limit of detection was found to be 1.2×10^<13> to 9.0×10^<13>g with the recoveries ranging from 72.9 to 114.5% and Relative Standard Deviation being less than 17.5%. In addition, the assay was applied to monitor the residues in 10 TCMs, amongst which at least one of the above pesticides were found in 67 samples. The results showed that α-BHC was the most frequently detected with a presence of 44.6% in the tested samples, whilst heptachlor epoxide, trans-chlorodane, cis-chlorodane and p,p'-DDD were not detected at all. Nonetheless, none of pesticides in all samples appeared to exceed the maximum residue limits (MRLs) seen in the Chinese regulations.
2007-08-01