Registration Dossier
Registration Dossier
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EC number: 953-178-5 | CAS number: -
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
Based on all the available information, toxicity to sediment organisms is not expected to be of concern.
Key value for chemical safety assessment
Additional information
No experimental data is available, in which the toxicity of the target substancedecyl isooctadecanoate (CAS 84605-08-3)to sediment organisms was assessed. However, only negligible discharge to the aquatic environment is expected to occur via sewage treatment plants (STPs) due to ready biodegradability and the high adsorptive properties of the substance, resulting in an effective removal from water by adsorption to suspended matter, which is an important physical elimination process in STPs (Guidance R.7a, ECHA, 2017). Whatever fraction should still reach the aquatic environment is expected to undergo rapid and ultimate degradation and whatever still remains will adsorb to organic soil and sediment particles leading to the potential exposure of benthic organisms via feed and contact with suspended organic particles.However, based on the physico-chemical properties, the bioavailability of the substance is expected to be low due to its strong binding behavior (high Koc). Therefore, chronic exposure of sediment organisms is unlikely. Furthermore, the substance is not toxic to aquatic organisms up to the limit of water solubility.
Based on all the available information, toxicity to sediment organisms is therefore not expected to be of concern.
Intrinsic properties and fate
Monoesters of C16 and C18 (branched and linear) fatty acids with decan-1-ol is readily biodegradable.According to the Guidance on information requirements and chemical safety assessment, Chapter R.7b (ECHA, 2017), readily biodegradable substances can be expected to undergo rapid and ultimate degradation in most environments, including biological STPs. Therefore, only low concentrations of this substance are expected to be released into the aquatic environment, if at all.
Furthermore, Monoesters of C16 and C18 (branched and linear) fatty acids with decan-1-ol has an estimated log Koc of > 5.0 and is poorly soluble in water (< 0.16 mg/L, 20 °C, OECD 105).The guidance on information requirements and chemical safety assessment, Chapter R.7b (ECHA, 2017) states that 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. Therefore, discharge into the aqueous/sediment compartment is probably negligible and chronic exposure of sediment organisms is unlikely.
Aquatic ecotoxicity
According to the available short-term toxicity data for fish, aquatic invertebrates and algae, as well as long-term toxicity data for aquatic algae and aquatic invertebrates, it can be expected that Monoesters of C16 and C18 (branched and linear) fatty acids with decan-1-ol will not cause acute or chronic toxicity to aquatic organisms up to the limit of water solubility (< 0.16 mg/L, 20 °C, OECD 105). Moreover, due to the low water solubility, it is highly unlikely that relevant, bioavailable concentrations of the test item will ever occur in the water phase, i.e. that concentrations high enough to induce any measurable acute or chronic effects in aquatic organisms are highly unlikely to be attained.
Furthermore, no toxic effects on activated sludge microorganisms were observed. Significant deviations from this overall ecotoxicological profile are not expected and it is thus concluded that Monoesters of C16 and C18 (branched and linear) fatty acids with decan-1-ol is unlikely to cause toxic effects toward sediment organisms.
Conclusion
Due to ready biodegradability and high adsorption, only negligible concentrations of the substance are expected to be discharged into water bodies, if at all. Whatever fraction is released is expected to rapidly degrade or adsorb to particles of sediment and soil leading to a potential exposure of sediment organisms via feed and contact with suspended organic particles. However, based on the physico-chemical properties of the substance (i.e. strong binding behaviour), bioavailability is expected to be low.
Furthermore, the available aquatic toxicity data suggest that no toxic effects occur up to the limit of water solubility. Moreover, due to the extremely low water solubility of the substance, relevant concentrations of the substance are not expected to ever be attained in water. Therefore, it is concluded thatd Monoesters of C16 and C18 (branched and linear) fatty acids with decan-1-ol does not pose a risk to sediment organisms.
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