Registration Dossier
Registration Dossier
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EC number: 500-201-8 | CAS number: 68213-23-0 1 - 2.5 moles ethoxylated
Endpoint summary
Administrative data
Description of key information
Additional information
Category information on envrionmental fate and pathway of alcohol ethoxylates
Alcohol ethoxylates are readily biodegradable under aerobic conditions and also anaerobically biodegradable (HERA, 2009). The main mechanism of primary biodegradation for the linear and essentially linear AE is the central cleavage of the molecule, leading to the formation of long chain alcohol and polyethylene glycol (HERA, 2009; Marcomini et al., 2000a; Marcomini et al., 2000b). Long chain alcohols themselves are readily biodegradable up to C18 (SIDS, 2006).
Abiotic degradation in water, soil, sediment and air is not expected to occur because of the chemical structures of AE homologues. Neither hydrolysis under normal environmental conditions (pH range from 4 to 9) nor photolysis in the atmosphere, in water, or when absorbed to soil and sediment surfaces, is to be considered (HERA, 2009).
Experimentally determined BCF-values given for pure homologues and summarized in the publication of Tolls et al. (2000) are used as read-across data for the endpoint bioaccumulation in water. It can be stated that bioaccumulation of alcohol ethoxylates is regarded to be negligible as the surfactants will be rapidly metabolised. For more detail see endpoint summary for bioaccumulation.
Concerning transport and distribution of the alcohol ethoxylate mixtures a high adsorption of the substances is determined by using QSAR-models. Adsorption onto surfaces is an intrinsic property of alcohol ethoxylates and thus a high Koc-value is expected.
More details on the category approach are given in a separate document (see attached IUCLID chapter 13).
Key information for the assessment of alcohol ethoxylate C12-18 < 2.5 EO, CAS 68213-23-0
Biodegradability
Readily biodegradable; 95% (O2 comsumption) in 28 days (OECD 301F)
Bioaccumulation potential
Bioaccumulation in organisms is negligible, due to biotransformation and excretion of alcohol ethoxylates.
Adsorption potential
A calculated Koc value of 60790 L/kg is used for the determination of PNECsediment with the equilibrium partitioning method.
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