PFOS is a persistent compound, shows little biodegradation and is globally distributed in living organisms. It is found in almost all animals, in almost all environments, including the Arctic and the Antarctic. Although it also has a high tendency to bioaccumulate, PFOS seems to behave differently from organochlorine compounds: for PFOS no clear relationship of bioaccumulation with age could be determined .
These compounds have been present in biota for decades, but only recently concern has been raised about their potential environmental and biological effects. Presently there is a lot of uncertainty about their exact environmental fate and their accumulation patterns.
Concentrations which have been shown in laboratory conditions to cause acute toxicity in fish range from 4,7 mg/l till 370 mg/l, depending on the species. The lowest concentration which significantly affected the growth and survival of a fish species was 0,3 mg/l. Environmental concentrations can reach 0,2 µg/l in the heavily polluted Tokyo Bay.
PFOS has been shown to influence the lipid metabolism (in rodents), to reduce weight gain and food consumption. The latter leads to abortions and reduced fetal weight. It is also suspected to induce liver necrosis.
Environmental standards and legislation
- www.wikipedia.org July 31 2009
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