Environmental half lives are a different animal. I vaguely recall some obs studies that estimate a half life of PFOA to be 90 (water), 114 days for PFOS, their

Environmental half lives are a different animal. I vaguely recall some obs studies that estimate a half life of PFOA to be 90 (water), 114 days for PFOS, their half-life in water is greater than 90 years for PFOA and greater than 41 years for PFOS, according to a 2014 publication from the EPA. There's also a study from Europe showing vastly different half-lives based on soil temperature (colder temps -> longer half life), but I cannot locate the paper at the moment. US EPA. (2014). Emerging Contaminants Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoic Acid (PFOA), https://www.wqa.org/Portals/0/Government%20Relations/factsheet_contaminant_pfos_pfoa_m https://www.wqa.org/Portals/0/Government%20Relations/factshe... arch2014.pdf