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per- and polyfluoroalkyl substances

Mark wants dangerous PFAS chemicals gone! 🚫

December 6, 2022

Mark wants dangerous PFAS chemicals gone! 🚫

#per- and polyfluoroalkyl substances

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per- and polyfluoroalkyl substances

Per- and polyfluoroalkyl substances are synthetic organofluorine chemical compounds that have multiple fluorine atoms attached to an alkyl chain. As such, they contain at least one perfluoroalkyl moiety, –CnF2n–.
According to OECD, there are at least 4730 different PFASs. A U.S. Environmental Protection Agency (EPA) toxicity database, DSSTox, even lists 8163 PFASs. A subgroup, the fluorosurfactants or fluorinated surfactants, have a fluorinated “tail” and a hydrophilic “head” and are thus surfactants. They are more effective at reducing the surface tension of water than comparable hydrocarbon surfactants. They include the perfluorosulfonic acids such as the perfluorooctanesulfonic acid (PFOS) and the perfluorocarboxylic acids such as the perfluorooctanoic acid (PFOA). PFOS and PFOA are persistent organic pollutants and are detected in humans and wildlife.

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