Accelerated solvent extraction(ASE) technique was used to extract perflurooctanoic acid(PFOA) and its salts from packaging materials.The extract was quantified after reacting with acetyl reagent by gas chromatography-mass spectrometric (GC-MS) method using perflurodecanoic acid methyl ester as an internal standard.The GC-MS conditions were: HP-Innowax capillary column;oven temperature,50 ℃(5 min)30 ℃/min240 ℃(5 min);splittless mode;injection volume,1 μL;chemical ion source,reacting gas,CH4,20%;selective ion...