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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The QSAR-predicted Koc of trifluoroethanol ranges between 4.14 and 5.50. The average Koc value is 4.8 (Log Koc 0.68).

Key value for chemical safety assessment

Koc at 20 °C:
4.8

Additional information

In accordance with column 2 of REACH Annex VIII, the adsorption/desorption test (required in § 9.3.1) does not need to be conducted as the substance can be expected to have a low potential for adsorption. Trifluoroethanol has indeed a low octanol water partition coefficient (log Kow <0.3). However, a Koc value is required for the estimation of several PNEC values. Therefore the organic carbon-water partitioning coefficient (Koc) was predicted using the KOCWIN v2.0 modelling program published by the US Environmental Protection Agency. The calculated Log Koc values ranged between 0.62 and 0.74. According to chapter R.7.8.7 of the Guidance on information requirements and chemical safety assessment, a substance with a Koc in this range can be considered as not likely to be adsorbed to sediment.