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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The estimated log Koc values for CBS, using different accepted calculation methods are 3.86, 3.56 and 4.15 (Currenta, 2010). The lowest log Koc of 3.56 is used for further assessment as a worst case assumption.
The log Koc of the described metabolites of CBS, such as MBT, MBTS, BT, and MeSBT, are mostly higher than 3 indicating moderate to strong potential for soil and sediment adsorption as the same as CBS. Only BTon (estimated log Koc of 1.93) and MeBT (estimated log Koc of 2.30) have very low adsorption potential.

Key value for chemical safety assessment

Additional information

In the EU-risk assessment, log Koc was estimated from log Pow, which was an experimental result from Monsanto (1980). The Monsanto study for log Pow is assigned to be a reliability of 3 in up-to-date assessment due to inappropriate experimental method used. The newly determined log Pow is used here for further estimation of log Koc. As a worst-case assumption, the lowest log Koc of 3.56 is used for further exposure assessment of PNEC in sediment and soil using EPM method.

According to the classification scheme of Swann et al. (1983) estimated log Koc-values 3.56 -4.15 indicates a high sorption potential to soil and sediment and suggests a slow migration potential to ground water.