Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 939-479-4 | CAS number: 1471311-60-0
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-MIPA are not required.
Key value for chemical safety assessment
Additional information
Assuming full and rapid dissociation of LAS-MIPA in aqueous environments, data on the adsorption/desorption behaviour of LAS-Na and MIPA can be used to describe the adsorption and desorption behaviour of LAS-MIPA. Both Las-Na and MIPA decompose rapidly as well, and therefore no data on the adsorption/desorption behaviour of LAS-Na and MIPA is required, however, the following information is available:
MIPA:
Calculated logKoc-values of 0.2525 and -0.0225 are available based on estimates from MCI and log Kow respectively. However, this value refers to the uncharged molecule and a pka value of 9.82 indicates that the molecule will predominantly exist as a cation in the environment. Therefore, a log KOC of 1,24 (pH 7.0) was calculated using a log KOC calculation method for ionized molecules according to Franco & Trapp (2008) in which a log Pow = -1.19 and a pKa = 9.82 as input parameters were taken into account.
As the chemical is readily biodegradable, adsorption to the solid soil phase is expected to be negligible.
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.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
