Registration Dossier
Registration Dossier
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EC number: 296-566-3 | CAS number: 92797-30-3
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
Based on all the available information, toxicity to sediment organisms is not expected to be of concern and further testing is not proposed.
No experimental data is available for the assessment of the toxicity offatty acids, C14-22, C16-24-alkyl esters (CAS 92797-30-3)to sediment organisms.
However, toxicity to sediment organisms is not expected because the available data indicates that both the exposure on the one hand and the hazard on the other hand can expected to be low for this substance.
Only negligible releases into surface water from sewage treatment plants (STPs) are expected due to a) the ready biodegradability and b) the high adsorption properties of the substance, resulting in an effective removal in STPs. Moreover, the substance is poorly soluble in water (< 2.5 µg/L), making it unlikely for dissolved concentrations to reach effective levels in the aquatic environment. Therefore, chronic exposure of sediment organisms is unlikely.
Furthermore, the substance is not toxic to aquatic organisms up to the limit of water solubility (< 2.5 µg/L). Taken together, toxicity to sediment organisms is not expected to be of concern.
Intrinsic properties and fate
Fatty acids, C14-22, C16-24-alkyl esters (CAS 92797-30-3)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 environment, if at all.
Furthermore,fatty acids, C14-22, C16-24-alkyl esters (CAS 92797-30-3)has an estimated log Koc of > 5.0 and is poorly soluble in water (< 2.5 µg/L).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. Thus, discharge into the aqueous/sediment compartment is likely negligible and chronic exposure of sediment organisms is improbable.
Aquatic ecotoxicity data
According to the available short-term toxicity data for fish, aquatic invertebrates and algae as well as long-term toxicity data for aquatic invertebrates and algae, it can be expected that fatty acids, C14-22, C16-24-alkyl esters (CAS 92797-30-3) will not cause acute or chronic toxicity in aquatic organisms up to the limit of water solubility (< 2.5 µg/L). Moreover, due to the extremely 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 fatty acids, C14-22, C16-24-alkyl esters (CAS 92797-30-3) is unlikely to cause toxic effects to sediment organisms.
Conclusion
Due to ready biodegradability and high adsorption, only negligible concentrations of the substance are expected to be discharged into environmental water bodies, if at all. Whatever fraction should still be released is expected to rapidly degrade or adsorb to particles of sediment and soil where sediment organisms are potentially exposed via feed and contact with suspended organic particles. However, based on the physico-chemical properties of the substance (i.e. strong binding behaviour), the bioavailability is expected to be low. If uptake should occur, extensive and fast biotransformation of the substance and its metabolites is expected by the action of ubiquitous carboxylesterases. The estimated high log Kow further provides supportive evidence that bioaccumulation is not of concern. 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 that fatty acids, C14-22, C16-24-alkyl esters (CAS 92797-30-3) does not pose a risk to sediment organisms.
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