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Determination of Organochlorine Pesticide Residues in 13 Miao Medicines in Guizhou by UAE-SPME-GC Method

??OBJECTIVE To establish a new gas chromatography method coupled with ultrasound-assisted extraction and solid-phase microextraction for rapid analysis of organochlorine pesticide residues (OCPs) in 13 Miao medicines in Guizhou. METHODS Flos Lonicerae Japonicae was used as an optimization object. Before being analyzed by GC, the sample was extracted by organic solvent and ultrasound, then enriched by SPME. RESULTS Under the optimized conditions, the linearities of eight kinds of OCPs ranged from 12.5 to 500 ng??g^-1, all with good correlation coefficients. The spiked recoveries ranged from 70.4% to 119.8% and relative standard deviations (RSDs) ranged from 8.9% to 14.1%. The detection limits were 1.03-3.45 ng??g^-1. CONCLUSION UAE-SPME-GC method simplifies the preparation steps for traditional Chinese medicines by direct sample enrichment and analysis thus sparing further purification. It is a convenient, environmentally-friendly and rapid method.