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EC number: 500-295-0 | CAS number: 106233-09-4 1 - 2.5 moles ethoxylated
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
The chemical safety assessment according to Annex I of Regulation (EC) No. 1907/2006 does not indicate the need to investigate further the effects on sediment organisms. Alcohols, C16-18, ethoxylated, phosphates (CAS No. 106233-09-4) is ready biodegradable, therefore chronic exposure of sediment organisms is unlikely. In addition, available data indicate, that the test substance is not bioaccumulative. Based on the available information, toxicity to sediment organisms is not expected to be of concern.
Key value for chemical safety assessment
Additional information
The chemical safety assessment according to Annex I of Regulation (EC) No. 1907/2006 does not indicate the need to investigate further the effects on sediment organisms. Alcohols, C16-18, ethoxylated, phosphates (CAS 106233-09-4) is ready biodegradable, therefore chronic exposure of sediment organisms is unlikely. In addition, available data indicate, that the test substance is not bioaccumulative. Based on the available information, toxicity to sediment organisms is not expected to be of concern.
Distribution to the environmental compartments intrinsic properties and fate
Since direct release of the substance to the aquatic system is not anticipated, release to the aquatic compartment might occur via sewage treatment plants only. According to the Guidance on information requirements and chemical safety assessment, Chapter R7.b (ECHA, 2012b) once insoluble chemicals enter a standard STP, they will be extensively removed in the primary settling tank and fat trap and thus, only limited amounts will get in contact with activated sludge organisms. Nevertheless, once this contact takes place, these substances are expected to be removed from the water column to a significant degree by adsorption to sewage sludge (Guidance on information requirements and chemical safety assessment, Chapter R.7b, ECHA, 2012b). Our substance of concern is characterized by a log Koc value of > 4 (MCI method) and is poorly water soluble (< 1 mg) and thus will undergo the same fate as stated in the Guidance document. Furthermore, alcohols, C16-18, ethoxylated, phosphates (CAS 106233-09-4) is determined to be readily biodegradable and according to the Guidance on information requirements and chemical safety assessment, Chapter R.7b, readily biodegradable substances can be expected to undergo rapid and ultimate degradation in most environments, including biological Sewage Treatment Plants (STPs) (ECHA, 2012b). Therefore, after passing through conventional STPs, exposure, of this substance into the aqueous/sediment compartment are likely to be negligible.
Aquatic ecotoxicity data
An acute aquatic toxicity study with fish showed that adverse effects occurred > 1 mg/L. However, acute toxicity tests towards aquatic invertebrates and algae were not available for initial submission. The dossier will be updated as soon as possible and the Chemical Safety Assessment according to Annex I of Regulation (EC) No 1907/2006 will be re-evaluated based on the outcome of these new studies.
Metabolism/Bioaccumulation
Alcohols, C16-18, ethoxylated, phosphates (CAS 106233-09-4) has log Kow > 5 (KOWWIN v1.67) indicating a potential for bioaccumulation. But due to the low water solubility, rapid environmental biodegradation and metabolisation, a relevant uptake and bioaccumulation in aquatic organisms is not expected. Please refer to IUCLID Section 5.3 for a detailed overview on bioaccumulation of this substance. Thus, taking all information into account, the substance is regarded as not bioaccumulative.
Conclusion
Due to its readily biodegradable nature, extensive degradation of this substance in conventional STPs will take place and only low concentrations are expected to be released (if at all) into the environment. Once present in the aquatic compartment, further biodegradation will occur and, due to the high log Kow, low water solubility and high adsorption potential, sediment organisms might be exposed to this substance mainly via feed and contact with suspended organic particles. After uptake by sediment species, extensive biotransformation of the substance is expected. Therefore, this substance is unlikely to pose a risk for sediment organisms in general and testing is thus omitted.
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