Perfluorohexanoic acid explained

Perfluorohexanoic acid (PFHxA) is a fluorinated carboxylic acid derivative of hexanoic acid. Fluorinated polymers with six carbon or less commonly degrade into perfluorohexanoic acid.[1]

Perfluorohexanoic acid does not seem to persistently bioaccumulate in the manner of many other PFAS. For example, in a study sponsored by the Swedish EPA, Swedish ski wax technicians, who have high PFAS exposure, did not have significantly higher levels of PFHxA in their blood samples when compared to the general population median for their age groups, even while having concentrations of other PFAS, like PFOA, up to 44 times higher than the general population.[2]

In 2020 Michigan adopted drinking water standards for five previously unregulated PFAS compounds including PFHxA which has a maximum contaminant level (MCL) of 400 parts per billion (ppb).[3] [4]

References

  1. Zahid . Muhammad . Heredia-Guerrero . Jose A. . Athanassiou . Athanassia . Bayer . Ilker S. . July 2017 . Robust water repellent treatment for woven cotton fabrics with eco-friendly polymers . Chemical Engineering Journal . en . 319 . 321–332 . 10.1016/j.cej.2017.03.006. 10261/344622 . free.
  2. Nilsson . Helena . Kärrman . Anna . Westberg . Håkan . Rotander . Anna . van Bavel . Bert . Lindström . Gunilla . A Time Trend Study of Significantly Elevated Perfluorocarboxylate Levels in Humans after Using Fluorinated Ski Wax . Environmental Science & Technology . 15 March 2010 . 44 . 6 . 2150–2155 . 10.1021/es9034733.
  3. Web site: Matheny . Keith . 3 August 2020 . Michigan's drinking water standards for these chemicals now among toughest in nation . live . https://web.archive.org/web/20220131152306/https://eu.freep.com/story/news/local/michigan/2020/08/03/tougher-pfas-standards-drinking-water-michigan/5574268002/ . 31 January 2022 . 31 March 2022 . Detroit Free Press.
  4. Web site: 3 August 2020 . New state drinking water standards pave way for expansion of Michigan's PFAS clean-up efforts . live . https://web.archive.org/web/20220103083526/https://www.michigan.gov/egle/0,9429,7-135--535602--,00.html . 3 January 2022 . 5 April 2022 . Michigan.gov.

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