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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The measured logKoc-values for different tested soil types were in the range of 2.51 - 3.13, and for the tested sediment types between 3.33 - 3.55 (CMA, 1989). The described metabolites of MBT, such as MBTS, BT and MeSBT, mostly have logKoc higher than 3. Only BTon has a very low estimated logKoc of 1.93 (EU-risk assessment, 2008).

Key value for chemical safety assessment

Additional information

According to the classification scheme of Swann et al. (1983) experimentally estimated log Koc-values lower than 3.7 indicates a moderate to strong sorption potential to soil and sediment and suggests a slow migration potential to ground water.

As a worst-case assumption, the lowest log Koc of 2.51 is used for further assessment such as distribution modelling and PNECs through EPM method.