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: 287-024-7
CAS number: 85408-62-4
Table 1: Distribution of
test items in Continuous Activated Sludge system
Sodium Lauryl [14C] Isethionate
Sodium [1-14C] Lauryl Isethionate
Sodium [1-14C] Stearyl Isethionate
Figures in parentheses relate to total 14C (parent, metabolites or
#All values corrected for recovery
The purpose of this study was to assess the environmental distribution
(percent degradation and concentrations in sludge and effluent) of
radio-labelled Defi test items in a continuous activated sludge (CAS)
system. It was not practical to assess the fate of a
commercial sample of DEFI, as it is a mixture of different chain lengths
of alkyl isethionates. Therefore, the items tested
(labelled in the alkyl chain) in this study were selected to represent
the shortest (lauryl isethionate)and longest (stearyl
isethionate)significant chain length present in the commercial mixture. In
addition, the lauryl isethionate(labelled in the isethionate group) was
included in the study.
The CAS systems were operated in accordance with EU L133/106 and OECD
Guideline 303A. The test was carried out at the
recommended temperature range (18-25 °C) with the hydraulic and sludge
retention times controlled at 6 hours and 6 days respectively. The
study deviated from the OECD 303A guideline in that the test items used
were radio-labelled. As a consequence the apparatuswas
modified to accommodate capture of14CO2. No
other modifications were made.
Concentrations of the test items obtained by scintillation counting in
the sludge and effluent were determined daily between 40 and 72 days
after a period of 40 days acclimatisation. All concentrations (sludge,
effluent and mineralisation) were corrected for mass balance (see below
table). In addition, HPLC analysis was conducted on samples collected at
the conclusion of the calculation period (Day 72) to ascertain the
concentration of parent material remaining in effluent and sludge and
the percentage primary degradation that had occurred.
Degradation of parent material was extensive with 99.61 to 99.99%
removed in the CAS systems. The concentrations of parent in the effluent
ranged from 0.01 to 0.11% and the concentration of the parent in the
sludge ranged from 0.21 to 0.28% of applied test item. The observed
distribution of the sodium [1-14C] lauryl isethionate and the sodium
[1-14C] stearyl isethionate was similar suggesting that all chain
lengths would behave in a similar manner in a CAS system.
Distribution of test items in Continuous
Activated Sludge system
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.
Welcome to the ECHA website. This site is not fully supported in Internet Explorer 7 (and earlier versions). Please upgrade your Internet Explorer to a newer version.
Do not show this message again