Registration Dossier
Registration Dossier
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EC number: 939-479-4 | CAS number: 1471311-60-0
Endpoint summary
Administrative data
Description of key information
Additional 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.
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.
If MIPA is exposed to water, it will not evaporate into the atmosphere from the water surface because of its low Henry's Law Constant of 0.0000494 Pa m³/mol (25 °C).
Due to the results of the Mackay LEVEL 1 calculation, over time the uncharged MIPA will preferentially distribute into water (99.8%).
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.
Fugacity modeling of LAS was done using several different models: Mackay level I, II, and III, the ChemCAN model, and the WW-TREAT, GRiDS, and ROUT models.Based on these findings, the dominant fate processes are degradation rates in water and soil, and water-sediment transfer.
The HAZCHEM derived from Mackay type level III model was used to calculate the distribution of LAS in the environment. Results show that most of the LAS partitions to soil, with relatively little in water or air. However, the amount in soil may be overpredicted as the model did not take into account degradation in soil.
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