title: Inhalation toxicity of ammonium perfluorooctanoate.
abstract: Ammonium perfluorooctanoate (CAS Registry No. 3825-26-1) is a fine white powder which can become airborne; hence its inhalation toxicity was studied in the male rat. The compound was found to be moderately toxic following single 4-hr exposures, with an LC50 of 980 mg/m3. This concentration produced both an increase in liver size and corneal opacity. Both findings diminished with increasing time after exposure. Subchronic head-only inhalation exposures (6 hr/day on 5 days/wk for 2 wk to 0, 1, 8 or 84 mg/m3) suppressed body-weight gain at 84 mg/m3. Reversible liver-weight increases, reversible increases in serum enzyme activities, and microscopic liver pathology, including necrosis, occurred at exposure of 8 and 84 mg/m3. No ocular changes were produced. Concentrations of organofluoride in the blood showed a dose relationship with initial levels of 108 ppm in rats treated at 84 mg/m3 falling to 0.84 ppm after 84 days with a blood half-life of 5-7 days. The no-observed-effect level was 1 mg/m3 and a mean organofluoride blood level of 13 ppm was detected in rats immediately after the tenth exposure to an atmospheric level of 1 mg ammonium perfluorooctanoate/m3.
mesh_terms: D000280:Administration, Inhalation; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D002210:Caprylates / Q000008:administration & dosage / Q000633:toxicity*; D003315:Cornea / Q000187:drug effects; D005459:Fluorides / Q000097:blood; D005466:Fluorocarbons / Q000008:administration & dosage / Q000633:toxicity*; D008099:Liver / Q000187:drug effects / Q000473:pathology; D009336:Necrosis; D009929:Organ Size / Q000187:drug effects; D011654:Pulmonary Edema / Q000139:chemically induced; D051381:Rats
chemical_list: D002210:Caprylates; D005466:Fluorocarbons; C023036:perfluorooctanoic acid; D005459:Fluorides