Abstract: A rapid method has been developed to determine the multi-residues of 36 organophosphorus pesticides in the products of animal origin using capillary gas chromatography with flame photometric detector (GC-FPD (P)). The organophosphorus pesticides were extracted with acetonitrile by accelerated solvent extraction, and cleaned up by auto gel permeation chromatography and primary secondary amine (PSA) packing material. The collected solution was analyzed by the GC-FPD (P) and quantified by internal standard method. The 36 organophosphorus pesticides were separated efficiently from impurity in high sensitivity and reproducibility by GC-FPD (P). The limits of detection (LODs) ranged from 0.0012 mg/kg (phorate) to 0.014 mg/kg (pyraclofos), and the limits of quantitation (LOQs) ranged from 0.004 mg/kg (phorate) to 0.047 mg/kg (pyraclofos). The recoveries ranged from 58.2% to 106.3% in blank samples spiked with 0.05, 0.1 and 0.2 mg/kg of 36 organophosphorus pesticides. The LODs, LOQs and the recoveries of the method all satisfy the requirement of pesticide residue analysis.

Key words: accelerated solvent extraction (ASE), gel permeation chromatography (GPC), organophosphorus pesticides, products of animal origin, residues , gas chromatography (GC)