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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Trifluoromethanesulfonic anhydride is rapidly hydrolysed in water, therefore it is not technically possible to measure a Koc value for this substance.The logKoc value of the degradation product, i.e. trifluoromethanesulfonic acid, is considered as relevant for the assessment of trifluoromethanesulfonic anhydride. No experimental data is available, but a default logKoc value has been calculated from the logKow using the equation of the TGD.

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

Based on its low logKow, trifluoromethanesulfonic acid is expected to have a low potential for adsorption onto soil and sediment (i.e. the substance has a logKow below 3).

For the calculation in the CSA, the equation of the TGD (Sabljic and Günsten, 1995) is applied to derive the logKoc value from the log Kow value. As no specific class is available for Trifluoromethanesulfonic acid in the proposed equations (e.g. no sulfonic acid class), the equation for "nonhydrophics" is selected as follows:

LogKoc = 0.52 * logKow + 1.02 = 0.52 * 0.3 + 1.02 = 1.176