全氟烷基和多氟烷基物质 （PFAS）.pdf

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1、W.L.Gore&Associates,Inc.INTRODUCTION TO PFAS AND FLUOROPOLYMERSBarbara J.Henry,Ph.D.W.L.Gore&AssociatesSlide 1/13W.L.Gore&Associates,Inc.PFAS are Related But Different!Slide 2/13W.L.Gore&Associates,Inc.OverviewPer-and Polyfluoroalkyl Substances(PFAS)Thousands of PFASwith a wide variety of properties

2、Differences1 fully fluorinated carbonSimilaritiesStabilitysecondsthousands of yearsToxicitylowhighMobilityinsoluble/non-volatileHighly mobileSizeMW less than 1,000 DaltonsMW multi-million DaltonsFFCPTFE on the spectrumGasesLiquidsSolidsSlide 3/13W.L.Gore&Associates,Inc.5 Classes1 GroupPFAS Per-and P

3、olyfluoroalkyl substancesOverviewPer-and Polyfluoroalkyl Substances(PFAS)FFFFCFFCPerfluoroalkyl SubstancesFFHFCFFCPolyfluoroalkyl SubstancesFFCFFCFFCOPolymeric Perfluoropolyethers Carbon and oxygen polymer backbone with fluorines directly attached to carbonFFCFFCFFCFFCFluoropolymersCarbon-only polym

4、er backbone with fluorines directly attachedNon-FspacerCCCSide-chain Fluorinated PolymersVariable composition non-fluorinated polymer backbone with fluorinated side chains2 CategoriesNon-PolymersPolymersCompounds for which all hydrogens on all carbons (except for carbons associated with functional g

5、roups)have been replaced by fluorinesCompounds for which all hydrogens on at least one(but not all)carbon have been replaced by fluorinesPerfluoroalkyl Acids(PFAAs)such as PFOA,PFOS,PFHxS,etc.4Slide 4/13W.L.Gore&Associates,Inc.W.L.Gore&Associates,Inc.Per-and Polyfluoroalkyl Substances(PFAS)5Slide 5/

6、13W.L.Gore&Associates,Inc.OECD(2018):4,730 PFAS US EPA(2019)7,000 PFAS using CompTox Chemicals Dashboard PFAS#depends on the PFAS definition Buck et al.,2011:highly fluorinated aliphatic(organic)substances with 1 C with all H replaced by F,so CnF2n+1,when n=1,F=3 OECD 2018:highly fluorinated substan