Registration Dossier
Registration Dossier
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EC number: 943-730-3 | CAS number: -
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
No experimental data evaluating the toxicity to sediment organisms are available for Monopentaerythritol tetraesters and dipentaerythritol hexaesters of 2-ethylhexanoic and n-valeric acids. Only negligible releases to the surface water from sewage treatment plants are expected to take place due to the high adsorption potential of this substance, resulting in an effective removal in sewage treatment plants by adsorption to activated sludge. Therefore, chronic exposure of sediment organisms is unlikely. Based on the available information, toxicity to sediment organisms is not expected to be of concern.
Intrinsic properties and fate
Monopentaerythritol tetraesters and dipentaerythritol hexaesters of 2-ethylhexanoic and n-valeric acids is not readily biodegradable (4.6 - 28% (CO2 evolution) after 60 d). Thus the substance is not expected to be degraded in sewage treatment plants to a high extent. Nevertheless an extensive physical elimination of the substance in STPs is expected. Due to the high log Koc of > 10 for the major components and poor water solubility the substance will adsorb to solids and suspended material. 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. Nevertheless, once this contact takes place, these substances are expected to be removed from the water column to a significant degree by adsorption to sewage sludge (Guidance on information requirements and chemical safety assessment, Chapter R.7a, (ECHA, 2017). Thus, discharged concentrations of these substances into the aqueous/sediment compartment are likely to be negligible.
Considering this one can assume that the availability of Monopentaerythritol tetraesters and dipentaerythritol hexaesters of 2-ethylhexanoic and n-valeric acids in the sediment environment is very low, which reduces the probability of chronic exposure of sediment organisms in general.
Bioaccumulation
Monopentaerythritol tetraesters and dipentaerythritol hexaesters of 2-ethylhexanoic and n-valeric acids is characterized by a low water solubility (1.5 - 5.1 mg/L) and high log Kow (> 10) for most of its components. Based on the physico/chemical properties such as low water solubility and high potential for adsorption a reduced availability in water is expected. It can be concluded that the bioaccumulation potential of Monopentaerythritol tetraesters and dipentaerythritol hexaesters of 2-ethylhexanoic and n-valeric acids is negligible. BCF/BAF values experimentally determined and estimated by QSAR (BCFBAF v3.01) also support this assumption (BCF values all well below 2000 L/kg).
For a detailed overview on bioaccumulation please refer to IUCLID section 5.3.1.
Conclusion
Due to its high potential for adsorption to sewage sludge in conventional STPs only low concentrations are expected to be released into the environment. If present in the aquatic compartment the substance will mainly partition to the sediment particles due to the low water solubility and high adsorption potential. Thus, the substance will be bioavailable to sediment organisms mainly via feed and contact with suspended organic particles. Moreover, the bioaccumulation potential is low. BCF/BAF values estimated by QSAR (BCFBAF v3.01) support this assumption (BCF values all well below 2000 L/kg). Therefore, Monopentaerythritol tetraesters and dipentaerythritol hexaesters of 2-ethylhexanoic and n-valeric acids is unlikely to pose a risk for sediment organisms and testing is thus omitted.
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