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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

Administrative data

Description of key information

Additional information

Based upon read-across to both Fatty acids, C12-18 and C18-unsatd., 2-sulfoethyl esters, sodium salts and Coco fatty acids 2 -sulfoethyl ester, sodium salt; Lauric acid 2 -sulfoethyl ester, sodium salt is readily biodegradable and has a low to moderate tendency to sorb to organic matter. In an OECD 106 sorption/desorption study, for two sludges an average Koc value of 1451 L/kg was observed for Lauric acid 2 -sulfoethyl ester, sodium salt, Biodegradation is thus considered to be the main removal mechanism of this substance.

Two simulation studies measuring the primary degradation [14C-radiolabelled] of the shortest (Lauryl, C12) and longer (Stearyl, C14 and C18) chained fatty acid isethionates have been conducted. The biodegradation of lauryl and stearyl isethionate in river water (OECD 314d) was shown to be extremely rapid with degradation half-life < 4 hours. DT50s in river water of C12 lauryl sodium isethionates was 0.21 h at 20 C and 0.36 h in water of sodium [14] stearyl isethionate (Brands, 2010). The partitioning and biodegradation of C12 and C18 fatty acid isethionates in activated sludge systems was estimated in an OECD 303A study (Gore, 2010). Extensive primary biodegradation of both short (Lauryl, C12) and the longest (Stearyl, C18) chained fatty acid isethionates was observed (99.8%), partitioning to sludge was minimal (0.16%) and the percentage parent material remaining in effluent was 0.05%. Degradation of the shortest chain-C12 lauryl sodium isethionates is even greater calculated at average % primary degradation of 99.88%, average % parent material in effluent of 0.02% and average % parent in sludge of 0.11%. Therefore the biodegradation offor lauric acid 2-sulfoethyl ester, sodium salt (sodium lauroyl isethionate) CAS No 7381-01-3 is demonstrated to be rapid and extensive.


The half-life in the different environmental compartments is expected to be short. No measured data is available which quantifies the half-life in soil or sediment. These values can therefore be estimated as a worst-case based on the readily biodegradability and the sorption data as determined in a sorption desorption test.




Degradation in river water:


Degradation in sediment

30 day

Degradation in soil

30 day

Lauric acid 2-sulfoethyl ester, sodium salt has a low vapour pressure and henry's law constant and because there are no important releases into the atmosphere degradation in air is thought to be of low relevance. Based on read-across, Coco fatty acids 2 -sulfoethyl ester, sodium salt no significant hydrolysis is predicted to occur according to the hydrowin module in EPIsuite. Based on read-across to Coco fatty acids 2 -sulfoethyl ester, sodium salt, degradation of lauric acid 2-sulfoethyl ester, sodium salt through hydrolysis is therefore not considered.

Direct photolysis of Lauric acid 2-sulfoethyl ester, sodium salt in air/water/soil will not occur, because it does not absorb UV radiation above 290 nm. Photo transformation in air/water/soil is therefore assumed to be negligible.

Lauric acid 2 -sulfoethyl ester, sodium salt is predicted to have a low tendency to partition to octanol and has a relatively high water solubility. The bioaccumulation potential of Lauric acid 2 -sulfoethyl ester, sodium salt was therefore assessed based on the ratio of the octanol and water solubility and resulted in log Kow values of 0.6 indicating a low bioaccumulation potential.