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EC number: 287-024-7
CAS number: 85408-62-4
A range of OECD environmental
fate studies assessing the biodegradation of Fatty acids, C12-18 and
C18-unsatd., 2-sulfoethyl esters, sodium salts (CAS Number:85408-62-4)
in aerobic and anaerobic media have been conducted. The registered
substance is a
multi constituent substance, with four main constituents >10%: C12, C14,
C16 and C18 fatty acid isethionates (C12= 26%, C14= 14%, C16=28%, C18=
23%). In addition, the registered substance that is commercially
available contains <10% (minor constituents) C8 and C10 fatty acid
isethionates, and unreacted impurities including free
Sodium Isethionate (SI), free fatty acids and sodium vinyl sulphonate.
Screening studies, assessing the evolution of CO2from the
test systems were conducted using the test material and SLI(76), where
SLI(76) has the fatty acids stripped from the commercial
mixture.Biodegradation of the test material was shown to be rapid under
aerobic (301B) and anaerobic (ISO 11734, 1995) conditions.
Unilever_Ready biodegradation_BD-RS43 -01 (1983) demonstrated that DEFI
is readily biodegradable with ≥77.8% degradation within 28 days and the
10 day-window was met following OECD 301B.
A number of simulation studies measuring the primary degradation
[14C-radiolabelled] of the shortest (Lauryl, C12) and the longest
(Stearyl, 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 (Unilever_River die-away_KDE100028, 2010). The partitioning and
biodegradation of C12 and C18 fatty acid isethionates in activated
sludge systems was estimated in an OECD 303A study (Unilever_CAS
Study_ECS090080, 2010). Extensive primary biodegradation of both short
and long chained isethionates was observed (99.8%), partitioning to
sludge was minimal (0.16%) and the percentage remaining in effluent was
Due to the very low weighted average log Kow (1.65) the test material
has a very low potential for bioaccumulation. The average measured log
Koc for C12 sodium isethionate was 3.16 showing moderate partitioning to
organic matter (Unilever_Adsorption/desorption_KAS090058, 2009).
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.
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