Registration Dossier
Registration Dossier
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EC number: 241-646-5 | CAS number: 17671-27-1
Endpoint summary
Administrative data
Description of key information
Additional information
Docosyl docosanoate (CAS 17671-27-1) is characterized by low water solubility (< 0.4 mg/L, at 20 °C, OECD 105), a high estimated log Kow 20.51 (QSAR, EPI Suite v.411, Kowwin v1.68) and a high estimated log Koc of > 5.0 at 25 °C (QSAR, EPISuite v4.11, KOCWIN v2.00), indicating that the substance is highly lipophilic and has a high potential for adsorption to soil and sediment particles. Experimental results from a standard biodegradation study demonstrated that docosyl docosanoate is readily biodegradable according to the OECD criteria (75.3% BOD after 28 d, OECD 301 C). Thus, abiotic degradation via hydrolysis is presumably no relevant transformation process.
Due to the ready biodegradability and high potential for adsorption, the substance can be effectively removed in conventional sewage treatment plants (STPs) by biodegradation and by sorption to biomass. Therefore, only negligible concentrations of the substance are likely to be released into the environment through conventional STPs (if at all) and whatever fraction is released will undergo extensive biodegradation or sorption onto organic matter. Consequently, the bioavailability of the substance in the water column will be rapidly reduced and the relevant route of uptake by aquatic organisms is expected to predominantly occur by ingestion of particle bound substance. However, based on the physico-chemical properties, its bioavailability to sediment organisms is presumably also low.
Thus, if the docosyl docosanoate is released to the environment it has a high potential for adsorption to sediment and soil particles. However, due to its ready biodegradability, it is unlikely that the substance persists in the environment.
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