Does this mean that if we stopped producing any new forever chemicals today, it would take more or less three years for organisms to expel them from their systems? Are they destroyed or simply taken out of the organisms and ready to be reabsorbed by the same or another organism for ever?
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.
