IUPAC Name: 2,3,4,5,6-pentachlorophenol
MCL: 0.001 ppm
Source: Used a wood preservative and restricted-use pesticide.
Summary: Pentachlorophenol is a synthetic chemical that is a member of the chlorophenols. It is a restricted-use pesticide and preservative applied to wood. It was commonly used until 1984 when certification became required to use the chemical. It is soluble in water up to 14 mg/L at 25 C and has a density of 1.978 g/mL. Upon decomposition it will produce gaseous carbon monoxide and hydrogen chloride as well as other chlorinated phenols. It has an acid dissociation constant of pKa = 4.70. Pentachlorophenol is classified by the EPA as a Hazardous Air Pollutant (HAPs). As a vapor in the atmosphere it will react with hydroxyl radicals and degrade with a half-life of 29 days. Koc values ranging from 1250 to 25000 indicate low to no mobility within soil. The compound may be susceptible to photolysis, and this may be a major fate process. Bioaccumulation is expected to be moderate to high.
GHS Hazard Statement: H300, H301, H310, H311, H315, H319, H330, H335, H351, H360, H370, H372, H400, H410, H413, GHS06, GHS07, GHS08, GHS09