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Widespread exposure to several per/polyfluorinated alkyl substances (PFAS) is associated with a variety of toxicities that include liver and endocrine toxicity. The National Toxicology Program (NTP) conducted 28-day toxicity studies in male and female Sprague Dawley (Hsd:Sprague Dawley SD) rats (n = 10/dose; five doses per chemical) to compare the toxicities of seven PFAS (three sulfonic acids or salt: perfluorobutane sulfonic acid [PFBS], perfluorohexane sulfonate potassium salt [PFHxSK], and perfluorooctane sulfonic acid [PFOS], and four carboxylates) via gavage in deionized water with 2% Tween 80. This report describes the studies for the two sulfonic acids (PFBS and PFOS) and salt (PFHxSK); a companion report (NTP Toxicity Study Report 97) describes the studies for the PFAS carboxylates. Doses were 0 to 1,000 mg/kg/day for PFBS, 0 to 10 mg/kg/day for PFHxSK males, 0 to 50 mg/kg/day for PFHxSK females, and 0 to 5 mg/kg/day for PFOS. (Abstract Abridged).

toxicity report series

NTP Technical Report on the Toxicity Studies of Perfluoroalkyl Sulfonates (Perfluorobutane Sulfonic Acid, Perfluorohexane Sulfonate Potassium Salt, and Perfluorooctane Sulfonic Acid) Administered by Gavage to Sprague Dawley (Hsd:Sprague Dawley SD) Rats