1,1,1-Trichloroethane

IUPAC Name: 1,1,1-Trichloroethane

MCL: 0.2 ppm

Source: Currently used as a pesticide and intermediate in fluorocarbons. Formerly used in many commercial products, and widely used as a solvent.

Summary:  1,1,1-trichloroethane (also known as trichloromethane or methyl chloroform) is an organic compound widely used as a solvent. Until 2002 the compound had many household and commercial applications. Production largely stopped in the United States due to research that showed the compound depleting the ozone layer. There is still limited production used to create fluorochemicals and pesticides (for non-food related uses). The compound is an isomer of 1,1,2-trichloroethane. It exists as a colorless liquid at room temperature. It is soluble in water up to 1,290 mg/L at 25 C and has a density of 1.3376 g/mL at 20 C. 1,1,1-trichloroethane is classified by the EPA as a Hazardous Air Pollutant (HAPs). As a vapor in the atmosphere the compound is photochemically degradaded with a half-life of 4.6 years. The compound may exist above the stratosphere where reactions with UV-C combine to degrade the ozone. Koc values of 66 – 151 indicate high mobility within soil. Volatilization is expected to be a major fate process in water and soil.

GHS Hazard Statement: H225, H315, H319, H332, H335, H336, H351, H361, H370, H372, H373, H400, H410, H420, GHS02,GHS07, GHS08, GHS09