Transcription of Dossier Per- and polyfluoroalkyl substances (PFASs)
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Dossier Per- and polyfluoroalkyl substances (PFASs)
DOI: 1 Dossier Per- and polyfluoroalkyl substances ( pfass ) July 2016 Birgit Geueke 1 IntroductionPerfluoroalkyl and polyfluoroalkyl substances ( pfass ) are used in various consumer and industrial products, including food contact materials (FCMs) (Figure 1). Thousands of different pfass have been synthesized in the past decades [1]. Their common properties include high water and oil repellency as well as thermal and chemical stability. PFAS are fluorinated aliphatic substances in which the hydrogen substituents of at least one terminal carbon atom are completely replaced by fluorine atoms, all PFAS contain the moiety CnF2n-1- [2]. substances where fluorine is substituted for all hydrogen atoms (except those belonging to functional groups) are designated as perfluoroalkyl substances .
2 Perfluoroalkyl carboxylic acids (PFCA) PFCAs, another important group of PFAAs, have the general structure CF 3 (CF 2) n COOH (4).Perfluorooctanoic acid (PFOA, 5, CAS 335-67-1) is the most prominent example of PFCAs.
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