The PFOS in paper products was extracted with methanol by the accelerated solvent extractor ASE-300.Then,the extracted liquid was concentrated,purified,film-filtered and volume-specified.It was determined by LC-MS/MS,the amount was determined by external method.By using selective ion monitoring for positive evidence,the determination method for PFOS in paper products by LC-MS/MS was developed.The results showed that detection limit,linear range,and recovery rate of this method,for perfluorooctane sulfonates...