Determination of 17 organochlorine pesticide residues in Renshen Guipi Pills by GC-ECD
Objective To establish a method of simultaneous determination 17 organochlorine pesticide residues in Rensh-en Guipi pills by gas chromatography electron capture detection(GC-ECD).Methods The samples were dispersion with water,acetone and sodium chloride of appropriate amount by ultrasound;The pesticides were extracted with dichlorometh-ane,centrifuged migrate.The organic phase was steamed to dry by reducing the pressure after dehydration with anhydrous so-dium sulfate.Dissolveed by N-hexane,sulfuric acid solution and water to remove impurities,the pesticides were determined by GC-ECD.Results All the 17organochlorine pesticides showed good linearities in the reasonable rang of 0.76 to 100.30 ng/ml with the linear collection coefficients(r)greater than 0.995.The LODs of each pesticide were all in the range of 0.001 1-0.001 8 mg/kg,and the average recoveries of all the pesticides were in the range of 73.6％-110.1％.Conclusion This method is highly sensitive,accurate and reliable and can be used to determine 17 organochlorine pesticide residues in Renshen Guipi pills.
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