Me-PFOA

A criterion often used to characterize the sorptivity of a poUutant on a sorbent is the Freundlich constant (A p), which can be normalized to the carbon mass (Me) of the target molecule (Me (PFOA and PFOS) 96 g carbon mol ). Based on the sorption affinity of different fi-actions of natural organic matter on activated carbon, Kc values of below 20 (mg C/g) (mg C/l) indicate a poor adsorbabihty, whereas compounds with Kc > 50 (mg C/g) (mg CA) can be considered as strongly adsorbable (derived from [19]). 

The preferred process consists of mixing sulfuric acid, methanol, and the fluori-nated emulsifier liquid resulting in a strongly acidic mixture containing the methyl ester of the perfluorinated emulsifier acid, that is, methyl perfluorooctanoate (Me-PFOA). Distillation of Me-PFOA yields a ternary mixture containing Me-PFOA along with water and methanol. Condensation of the vapor results in two phases. The lower phase is more or less pure ester while the upper phase consists of water... 

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