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Male and female Sprague-Dawley rats were administered 2,2,2-trichloroethanol (TCE) by gavage for 14 or 90 consecutive days. The gavage solution consisted of TCE dissolved in distilled water, containing 10% Emulphor. Doses of 37.5, 75, 150, and 300 mg/kg/day in the 14-day study and 40, 80, 160, and 320 mg/kg/day for the 90-day study were employed. Evaluation of clinical symptoms, clinical chemistry, and pathology examinations did not reveal a specific toxic effect or identify a target organ. In male rats an increase of red blood cells (RBCs) and hematocrit (Hct) in both 14- and 90-day studies, as well as increased hemoglobin (Hgb) in the 90-day study was observed at the highest dose level. In the high-dose females only increase of Hgb was seen in the 14-day study. These hematopoietic indices were not accompanied by commensurate changes in reticulocytes, mean corpuscular volumes or spleen weights. Serum lactic dehydrogenase (LDH) levels were increased in males at the two highest dose levels of both studies. Other changes in chemistries were sporadic in nature and did not appear to be dose related. Collectively, there was no basis to identify a target organ. The RBC and LDH levels did not correlate with other biochemical or pathology results and did not support the hypothesis that they represent a specific toxic effect. Based on the lack of detectable toxicity of TCE at the highest doses tested in rats, the following lowest observed adverse effect levels (LOAEL) were assigned for this chemical: in the 14-day exposure, 300 mg/kg/day for both sexes; in the 90-day protocol, 320 mg/kg/day for female; and 160 mg/kg/day for male rats.

Repeated-Dose and Subchronic Toxicity Studies of 2,2,2-Trichloroethanol in Sprague-Dawley Rats