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EC number: 500-464-9
CAS number: 160901-27-9
1 - 2.5 moles ethoxylated
According to the REACH regulation Annex IX column 2, studies on
the biodegradation in water and sediment do not need to be conducted if
the test item is readily biodegradable.
However, additional data obtained from different wastewater
simulation tests conducted in accordance of OECD Guideline 314 are
available. The results of these studies were used to calculate the
degradation kinetic constant k for STP, surface water and soil.
In three die-away studies performed in accordance with OECD
Guideline 314 A and 314 B the biodegradation potential of AES (C14, 3EO)
in wastewater was investigated. For testing raw sewage and activated
sludge (collected on different dates) from a municipal waste water
treatment plant receiving predominantly domestic wastewater was used.
The removal of AES (C14, 3EO) in raw sewage was 98.8% after 24 h and
98.0% in activated sludge after approx. 5 h.
Using raw sewage as inoculum, the test substance was converted to
metabolites and incorporated into solids. Mineralisation did not occur.
Using activated sludge as inoculum the test substances was mineralized,
converted to metabolites and incorporated into solids (P&G, 1988).
In a further wastewater simulation study Marks (P&G, 1994)
investigated the degradation of AES (C14, 3EO) under aerobic conditions
in accordance with OECD Guideline 314 B. Using activated sludge of a
sewage treatment plant fed predominately with domestic sewage AES (C14,
3EO) was mineralized to 88.3% after 28 days of exposure.
In a test conducted similarly to OECD Guideline 314 C AES (C14,
3EO) was incubated in anaerobic digester sludge. After 21 h 91% of the
radiolabelled test substance was mineralized. The half-life for primary
degradation was determined as 2.6 h while the half-life of ultimate
degradation was 3 h (P&G, 1994).
This result was supported by a similar test with AES (C14, 3EO)
according to OECD Guideline 314 C. After 14 days 88% of the applied
radioactivity was recovered in evolving gases. The half-life was
determined to be 0.67 d (P&G, 1994).
Biodegradation of AES (C14, 3EO) directly discharged into surface
water was simulated in a test following the procedures of OECD Guideline
314 D. In surface water (89% river water, 10% sewage treatment plant
effluent and 1% activated sludge), 39.7% of AES (C14, 3EO) were
mineralized after 48 hours. Remained parent compounds and metabolites
were not found. However, 60.3% were determined as non-extractable
residues (P&G, 1996).
In another simulation test in surface water in accordance to OECD
Guideline 314 D a mineralization rate > 87% was observed after 28 days
of exposure (P&G, 1994).
Taking into account all available results obtained from the
different simulation tests conducted according to OECD Guideline 314, it
was demonstrated, that alkylethoxysulfates are not persistent in water
and are ultimately removed under aerobic and anaerobic conditions.
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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