IUPAC Name: 2,2-dichloroacetic acid
Source: Forms as a byproduct of water treatment disinfection processes such as chlorination and chlorimation.
Summary: Dichloroacetic acid (DCAA) is a member of the haloacetic acids. More importantly, it is a member of the HAA5 disinfection byproducts. It is most commonly found in water as a result of water treatment processes such as chlorination. It has many other uses such as in the synthesis of organic compounds, and it is used for its astringent and caustic properties in the medical industry. It may exist in the environment as a degradation product of dichlorvos, an insecticide. It is soluble in water up to 1,000,000 mg/L at 20 C and has a density of 1.5634 g/mL. It has been characterized as highly corrosive and has an acid dissociation constant of pKa = 1.26. It exists in the vapor-phase in the atmosphere with a half-life of 22 days. A Koc value of 2 indicates very high mobility within soil suggesting that it may leach to groundwater. Biodegradation from water is expected to be a major method of natural degradation.
GHS Hazard Statement: H290, H303, H311, H314, H318, H341, H351, H360, H361, H370, H371, H372, H373, H400, H402, GHS05, GHS06, GHS08, GHS09