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3981827 
Journal Article 
Screening and identification of per- and polyfluoroalkyl substances in microwave popcorn bags 
Zabaleta, I; Negreira, N; Bizkarguenaga, E; Prieto, A; Covaci, A; Zuloaga, O 
2017 
Yes 
Food Chemistry
ISSN: 0308-8146
EISSN: 1873-7072 
230 
497-506 
English 
28407941 
WOS:000400533200060 
Liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (LC-QToF-MS) was used for the accurate identification (<10ppm) of different polyfluoroalkylphosphates (PAPs) and their intermediate and end degradation products in popcorn bags. Up to 46 per- and polyfluoroalkyl substances (PFASs) and precursors were identified. Moreover, an accurate method based on focused ultrasonic solid-liquid extraction (FUSLE) and a clean-up step with Envi-Carb sorbent was validated and applied to the quantification of 24 PFASs in popcorn bags from over twelve European countries, three American countries and two Asian countries. To the best of our knowledge, this is the first time that identification and quantification of some intermediates of PFAS precursors (different chain length fluorotelomer saturated acids (FTCAs) and fluorotelomer unsaturated acids (FTUCAs)) have been reported. Moreover, different patterns in the microwave popcorn bag composition were observed within the countries; while in European and American countries short chain PFASs were detected, Asian countries still use long chain PFASs. 
Per- and polyfluoroalkyl substances; Precursors; Degradation products; Microwave popcorn bag