Registration Dossier
Registration Dossier
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EC number: 298-078-6 | CAS number: 93777-46-9
Endpoint summary
Administrative data
Description of key information
Additional information
The target substance Decyl 2-ethylhexanoate (CAS 93777-46-9) is characterised by a low vapour pressure (≤ 1.7E-1 Pa at 20 °C), a low water solubility (1.82 - 2.40 µg/L at 20 °C) and a log Koc indicating a high adsorption potential to soil and sediment particles (log Koc = 4.389 - 5.102, MCI + log Pow method, KOCWIN v2.00). Based on the result from a standard biodegradation study confirmed with a reliable QSAR calculation (BIOWIN v4.10) and two structurally related substances, the target substance is readily biodegradable (76% after 28 d, OECD 301B). Thus, it is expected that an extensive elimination of the substance in sewage treatment plants will occur. Moreover, 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, 2017). As a result of the high adsorption potential of the substance (log Koc = 4.389 - 5.102, MCI + log Pow method, KOCWIN v2.00) a removal from the water column to a significant degree by adsorption to sewage sludge can be expected (Guidance on information requirements and chemical safety assessment, Chapter R.7b, (ECHA, 2017). In conclusion, the concentration of the substance in conventional STP effluents is presumably marginal. Abiotic degradation via hydrolysis is considered as not relevant for the substance. Moreover, the substance is not volatile (vapour pressure ≤ 1.7E-1 Pa at 20 °C) and thus evaporation to the air and subsequent transport through the atmosphere to other environmental compartments is not likely.
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