Abstract: Twenty kinds of typical food packaging materials were extracted with accelerated solvent extraction equipment.After the treatments of dehydration,filtration,concentration and derivatization,the contents of perfluorooctanoic acid ammonium(PFOA) in them were detected with GC-MS.The GC-MS-EI conditions were optimized as:using HP-INNOWAX pillar(30 m×0.25 mm,0.25 μm) with injection volume of 1 μl as chromatographic column,interface temperature 280 ℃,energy of EI resource 70 eV and temperature 150 ℃,temperature of QMS 230 ℃,and adopting SIM detection with five-minute solvent delay.The working curve for the detection of PFOA is Y=38402.12127X+4.562 with a linear range of 10 to 1.0×106 μg/L,the limit of detedion is 1.0 μg/L and the average recovery rate is 95% to 104%.No PFOA is found in other food packaging materials except polytetrafluoroethylene material,with 0.12×10-6 mg/kg PFOA detected.

Key words: food, packaging materials, PFOA, GC-MS-EI