Abstract:A method for simultaneous determination of 22 organochlorine pesticides residues in eggs, chicken and milk powder was established. The samples were extracted by acetonitrile solution, purified by Captiva EMR-Lipid solid phase extraction column, determined by gas chromatography (ECD) after n-hexane dissolution, and quantified with external standard method. The results showed that the linear relationship between the mass concentration of 22 organochlorine pesticides and their corresponding peak areas were good in the range of 0.005~0.2 mg/L, and the R2 were greater than 0.995. At spiked levels of 0.01, 0.02, 0.1 mg/kg, the recoveries of 22 organochlorine pesticides were between 60%~100% with RSD less than 10% after 6 repeated determinations, fitting the coefficient of variation in laboratory according to GB 27404-2008. This method could effectively remove animal fat and lipophilic interference in eggs, chicken and milk powder. Besides, the sensitivity, accuracy and precision of this method could meet the requirements of pesticides residue detection, providing an efficient and reliable analytical method for monitoring organochlorine pesticide residues in eggs, chicken and milk powder.
