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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-IPA are not required.

Key value for chemical safety assessment

Additional information

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

IPA:

Adsorption: Koc = 15 (Podsol)

Koc = 105 (Alfisol)

Koc = 107 (limnic soil/sediment)

Adsorption was reversible to great extent: the mass balance resulted in a recovery of > 80 %.

LAS-Na:

The adsorption-desorption behaviour of LAS in activated sludge was determined in batch experiments. The Kp for commercial LAS was2,500 L/kg, with a log Kp of 3.4.