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Environmental fate & pathways

Phototransformation in air

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Phototransformation in air: Key study: the rate constant for the vapor-phase reaction of trichloroacetic acid with photochemically-produced hydroxyl radicals is 5.2x10-13 cm3/molecule-sec at 25º C. This corresponds to an atmospheric half-life of about 20,569 days (12 -hours day) at an atmospheric concentration of 1,5x10 +6 hydroxyl radicals/cm3. (Calculation by EPI Suite v3.20, EPA (USA)/ AopWin v1.92).

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Additional information

Using the AopWin v1.92 model of EPI Suite v3.20, it is concluded that the rate constant for the vapor-phase reaction of trichloroacetic acid with photochemically-produced hydroxyl radicals is 5.2x10-13cm3/molecule-sec at 25º C. This corresponds to an atmospheric half-life of about 20,569 days (12-hours day) at an atmospheric concentration of 1,5x10-6hydroxyl radicals/cm3. This result is supported by further experimental data from a peer reviewed secondary source.