Registration Dossier
Registration Dossier
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EC number: 939-464-2 | CAS number: 121617-08-1
Adsorption / desorption
Administrative data
Link to relevant study record(s)
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.
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