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Environmental fate & pathways

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Adsortion/desorption tests results show that TFA is poorly absorbed to the soil and is considered as a mobile organic compound in the majority of soils investigated. The Kd ranged between 0.17 to 20 L/kg for organic and mineral soils (the organic horizon exhibiting greater retention) giving a geometric mean of 0.94 L/kg (SD=4.86, n= 20).

The Henry's Law constant (KH) for trifluoroacetic acid, 0.009 Pa.m3.mol-1, was calculated by the average of two measured values 8950 and 5800 at 25°C reported in two valid peer reviewed studies.With such a value and because trifluoroacetic acid is totally miscible with water and has a log Kow value of 0.79 at 25°C, the preferred environmental compartment will be water, rather than air, ground or biota.