“…The toxic potency of PFDA is quite high, with an LD 50 4.6-fold lower than that estimated for PFOA (Olson and Andersen, 1983). PFDA has also been reported to produce hepatotoxicity, anorexia, alteration of fatty acid metabolism, reduction of circulating thyroid hormones and androgen, bradycardia, and hypothermia in the rat (Bookstaff et al, 1990;George and Andersen, 1986;Gutshall et al, 1988Gutshall et al, , 1989Langley and Pilcher, 1985;Pilcher and Langley, 1986;Pilcher et al, 1987;Singer et al, 1990).…”