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- Determination of PFOS in instant food packing materials by LC-MS/MS was developed. The pro-cedure involves an extraction of the Food Packing Materials with 100% methanol soxcelet extraction method. The LCseparation was performed by Hypersil Gold (150 mm × 2.1 mm 5 um) with mobile phases of 2 mM amoniumacetatesolution and acetonitrile. The Mass spectral acquisition was done in negative ESI/SRM using the TSQ Quantum Ultra.With this method, good linear relationship, sensitivity and reproducibility were obtained. The rate of recoveries ofPFOS from paper material spiked with 1.0 ug/L were 99.84%, respectively. The limit of quantitation and limit ofdetection were below 0.03 ug/L and 0.009 ug/L. The method had been applied to determination of PFOS in instantfood packing materials.Key words : PFOS, LC-MS/MS, Food packing materials (Perfluorinated compounds, PFCs)        ,       ,  ,   ,  ,    ,     , , ,  , ,

The Determination of Perfluorooctane sulfonate in Food Packing Materials by HPLC-MS/MS