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EC number: 270-472-2 | CAS number: 68441-68-9
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
In consideration of all the available information,Tetraesters of 2,2-bis(hydroxymethyl)propane-1,3-diol and decanoic and octanoic acid (CAS 68441-68-9) is unlikely to pose a risk for sediment organisms and testing was therefore omitted.
Key value for chemical safety assessment
Additional information
No experimental data evaluating the toxicity ofTetraesters of 2,2-bis(hydroxymethyl)propane-1,3-diol and decanoic and octanoic acid (CAS 68441-68-9)to sediment organisms are available. However, only negligible release from sewage treatment plants into surface waters is expected due to ready biodegradability and the high adsorption properties of the substance, resulting in an effective removal by sewage treatment plants. Furthermore, the substance is not toxic to aquatic organisms up to the limit of water solubility and the potential for bioaccumulation is presumably low. Therefore, a chronic exposure of sediment organisms is unlikely and toxicity to sediment organisms is not expected to be of concern.
Intrinsic properties and environmental fate
Tetraesters of 2,2-bis(hydroxymethyl)propane-1,3-diol and decanoic and octanoic acid (CAS 68441-68-9) is readily biodegradable. According to the Guidance on information requirements and chemical safety assessment, Chapter R.7b, readily biodegradable substances can be expected to undergo rapid and ultimate degradation in most environments, including biological Sewage Treatment Plants (STPs) (ECHA, 2016). Therefore, only low concentrations of the substance are likely to be released (if at all) into the environment through conventional STPs.
Furthermore, the substance has a log Koc > 5 and is poorly water soluble (< 0.05 mg/L). The Guidance on information requirements and chemical safety assessment, Chapter R.7b (ECHA, 2016) 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 come into 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, 2016) and whatever remains will be extensively biodegraded (due to ready biodegradability). Thus, the amount of the substance discharged into the aqueous/sediment compartment is likely negligible.
In consideration of the above, the bioavailability of the substance in the sediment compartment is presumably very low, which reduces the probability of chronic exposure of sediment organisms in general.
Aquatic ecotoxicity data
The available data on the acute toxicity to fish, aquatic invertebrates and algae as well as chronic toxicity to aquatic invertebrates and algae showed that no adverse effects occurred in the range of the water solubility (< 0.05 mg/L) of the target substance Decanoic acid, mixed esters with octanoic acid and pentaerythritol (CAS 68441-68-9). Furthermore, no toxic effects to activated sludge microorganisms were observed. Significant deviations from this overall ecotoxicologcial profile are not expected and it is thus concluded that Tetraesters of 2,2-bis(hydroxymethyl)propane-1,3-diol and decanoic and octanoic acid (CAS 68441-68-9) 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 water bodies, if at all. Whatever fraction is 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), 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 carboxylesterases.
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 Tetraesters of 2,2-bis(hydroxymethyl)propane-1,3-diol and decanoic and octanoic acid (CAS 68441-68-9) does not pose a risk to sediment organisms.
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