Fact sheet: 2,4,5-trichlorophenol

From: Public Services and Procurement Canada

Discover a list of a contaminant's important chemical properties, how it will react in the environment, main sources of contamination related, and a brief overview of health and safety issues.

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General information

CAS number


Molecular formula


Formula weight

197.5 g/mol


Phenolic compounds

Properties (at room temperature where applicable)

Compound properties list
Melting/boiling point68 0CSolid
Relative density1.68Sinks in water
Vapour pressure0.02 mm HgLow volatility
Vapour density0N/A
Solubility in water1,200 mg/LModerately soluble
Henry's law constant2 x 10-7atm·m3/molSlow volatilization when dissolved
log Koc (Depending on soil or sediment characteristics)2.5 - 3.4*Moderate adsorption to organic matter

Environmental behaviour

At 20 0C, 2,4,5-trichlorophenol is a solid with very low volatility and moderate solubility. Once it is dissolved, it volatilizes slowly and adsorbs moderately to organic matter. When present in the soil, it dissolves at a moderate rate. In the dissolved phase, 2,4,5-trichlorophenol can reach the groundwater table or flow into a waterway, where it will be diluted before slowly volatilizing. Fragments of 2,4,5-trichlorophenol can also be carried into waterways where they will be deposited at the bottom and dissolve. Once the source has been removed, the adsorbed phase will take a while to disappear, slowly liberating contamination in either the gaseous or dissolved state. The resulting dissolved plume will be relatively moderate in size while the gaseous plume will be generally small in size.

Health and safety

2,4,5-trichlorophenol should be handled with care, as it is toxic.

Principal resources

In the United States, 2,4,5-trichlorophenol was taken off the market in 1985. The principle use for 2,4,5-trichlorophenol was as an intermediate, especially in the production of the herbicides 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T). 2,4,5-trichlorophenol was also used as a fungicide, bactericide and organic synthesis.


Agency for Toxic Substances and Disease Registry (ATSDR). 2006. Toxicological profile for Chlorophenols. U.S. Department of Health and Human Services, Public Health Service. Georgia, U.S.A. (Viewed December 2013)

Montgomery, John H. 2007. Groundwater Chemicals, Desk Reference, Fourth Edition, CRC Press, Taylor and Francis Group, Florida, U.S.A.

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