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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

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:


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.


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.