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Environmental fate & pathways

Adsorption / desorption

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Description of key information

According to the REACH legislation Annex VIII 9.3.1 a study on the adsorption/desorption behaviour does not need to be conducted if the substance and its relevant degradation products decompose rapidly. Therefore, data on the adsorption/desorption behaviour of LAS-TEA are not required. 

Key value for chemical safety assessment

Additional information

Assuming full and rapid dissociation of LAS-TEA in aqueous environments, data on the adsorption/desorption behaviour of LAS-Na and TEA can be used to describe the adsorption and desorption behaviour of LAS-TEA. Both Las-Na and TEA decompose rapidly as well, and therefore no data on the adsorption/desorption behaviour of LAS-Na and TEA is required, however, the following information is available:

TEA:

Due to the calculated Koc of 17 and its rapid degradation, adsorption of TEA to the solid soil phase (e.g. clay) is not expected.

LAS-Na:

The adsorption-desorption behaviour of LAS in activated sludge was determined in batch experiments. The Kp for commercial LAS was 2,500 L/kg, with a log Kp of 3.4.