Abstract: A method was established for quantitative determination of 45 organophosphorus pesticide residues and their metablites in animal original foods by dual gas spectrometry – dual pulse flame photometric detection. Homogenized samples were extracted with acetone and methylene chloride, and cleaned up by GPC. The response of each analyte showed a good linearity with its concentration with the linearity correlation not less than 0.99. The recovery experiments were performed by blank sample spiked at the low, medium and high fortification levels. The recoveries for beef, mutton, pork, chicken were in the range of 50.5 % ~ 128.1 % with the relative standard deviations (RSD, n=6) of 1.1 % ~ 24.4 %. The limits of detection for the analytes were in the range of 0.001 ~ 0.170 mg/kg, and the limits of quantification were in the range of 0.002 ~ 0.455 mg/kg. Animal original food samples collected from market such as meat, liver and kidney were analyzed, and residues of dichlorovis and disulfoton-sulfoxide were detected in some of those samples.

Key words: Animal original foods, Dual gas chromatography &ndash, Gel permeation chromatography cleanup, Metabolites, dual pulse flame photometric detection, Organophosphorus pesticides