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Chemical structure of some common long- and short-chain PFAS. PFOA – perfluorooctanoic acid (long-chain); PFOS – perfluorooctane sulphonate (long-chain); PFBS – perfluorobutane sulphonate (short-chain); PFBA – perfluorobutanoic acid (short-chain); GenX – hexafluoropropylene oxide dimer acid; PFHxS –1-chloro perfluorohexane sulphonate
