Registration Dossier
Registration Dossier
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EC number: 285-206-0 | CAS number: 85049-36-1
Endpoint summary
Administrative data
Description of key information
Additional information
Fatty acids, C16-18 and C18-unsatd., ethyl esters (CAS 85049-36-1) is considered to be readily biodegradable according to OECD criteria (100% in 28 d, read across). Due to the ready biodegradability a persistency of the substance in the environment is not expected. Abiotic degradation by hydrolysis is not relevant for the substance as indicated by QSAR calculations resulting in estimated half-lives for the main substance components in water of > 1 year at pH 7 and 281.6 days at pH 8. The substance is furthermore characterised by a low water solubility and a low vapour pressure. Together with the estimated high log Koc of single substance components these characteristics indicate that the substance would mainly distribute to soil and sediment when released to the environment.
However, an exposure of these environmental compartments is unlikely, since the substance is expected to be extensively eliminated in conventional sewage treatment plants. In the case insoluble chemicals enter a standard Sewage Treatment Plant (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, according to the Guidance on information requirements and chemical safety assessment, Chapter R.7b (ECHA, 2012). Due to the insolubility the substance is not expected to be present in the water column. The high adsorption potential of the main substance components (log Koc: 4.42 – 4.94 (MCI)) indicates a potential for adsorption to sewage sludge and thus a further decrease of the substance concentration in the water column is possible (Guidance on information requirements and chemical safety assessment, Chapter R.7b (ECHA, 2012). In conclusion, the concentration of the substance in conventional STP effluents is expected to be low.
The volatilization potential of the substance is negligible, based on a vapour pressure of 0.000173Pa at 20°C. Nevertheless, if released into the atmosphere, the substance is expected to be rapidly photodegraded based on the estimated half-lives of the main components in air of 4.6 hours up to 18.8 hours (AOPWIN 1.92 program). Based on the above information, accumulation in air, subsequent transportation and deposition into other environmental compartments is not anticipated.
Due to the rapid environmental biodegradation and metabolization via enzymatic hydrolysis a relevant uptake and bioaccumulation in aquatic organisms is not expected. Enzymatic breakdown will initially lead to the free fatty acid and glycerol. These hydrolysis products will be metabolised and excreted in fish effectively (Tocher, 2003). The low bioaccumulation potential is also indicated by BCF values of 13.08 - 25.17 L/kg and BAF values of 252.8 - 691.9 L/kg (BCFBAF v3.01, Arnot-Gobas, including biotransformation, upper trophic).
A detailed reference list is provided in the technical dossier (see IUCLID, section 13) and within the CSR.
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.
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