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Environmental fate & pathways

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Weight of evidence: experimental result and estimation: Based on experimental results, trichloroacetic acid was found to have a Koc value of 1 and showed little or no adsorption to soil. Using the PCKOCWIN v1.66 model of EPI Suite v3.20, the soil adsorption coefficient (Koc) of trichloroacetic acid is 2.738 (log Koc = 0.437).

Henry's Law constant:

Key study: EPI Suite estimation: It is concluded that the Henry's Law constant of trichloroacetic acid is 1.35 x 10-8atm.m3/mole at 25 ºC. This value indicates that trichloroacetic acid is expected to be essentially nonvolatile from water surfaces and from moist soil surfaces.

Distribution modelling:

Key study: Using the Fugacity_LEVEL3NT model of EPI Suite, EPA (US) v3.20, the following results were obtained:

Percent distribution in media: Air: 0.16%; Water: 36.3%; Soil: 63.5%; Sediment: 0.0845%

Persistence time: 326 h = 14 d

Half lifes; Air: 494 h = 20.6 d; Water: 900 h = 37.5 d; Soil: 1800 h = 75 d; Sediment: 8100 h = 337.5 d;

Volatilization from water; Half life from Model river: 55440 h = 2310 d = 6.3 years; from Model Lake: 604900 h = 25200 d = 69 years.

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