Perfluoroalkyl substances (PFASs), as coating materials, possess oil-resistant and waterproof properties. However, their persistency and toxicity have caused concerns. This study developed a method for determining five types of 20 PFASs with ultra-performance liquid chromatography/tandem mass spectrometry, and measured seven categories of 32 commercial samples of oil-resistant food packaging in Taiwan. The assay was validated according to the specification of Taiwan Food and Drug Administration (TFDA). Samples of 100cm2 were cut into pieces and were ultra-sonicated in 20-mL methanol at 50°C for 45 minutes. The extracts were concentrated to 1mL for instrumental analysis. Most matrix effect factors and extraction efficiencies of the analytes were 50%-80% and 52%-99%, respectively. Most limits of detection and limits of quantification were between 0.07-11.3 ng/dm2 and 0.17-18.3 ng/dm2, respectively. Most recoveries ranged from 70% to 117% at three tested levels, and the precisions (%RSD) were lower than 19%. Microwave popcorn paper...

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