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EC number: 500-204-4
CAS number: 68334-05-4
Taking all available information into accounFatty acids, C18-unsatd., dimers, 2-ethylhexyl esters is unlikely to pose a risk for sediment organisms and testing is thus omitted.
No experimental data evaluating the toxicity to sediment organisms is
available for Fatty acids, C18-unsatd., dimers, 2-ethylhexylesters (CAS
No. 68334-05-4). Since the substance is readily biodegradable, chronic
exposure of sediment organisms is unlikely. Furthermore, the substance
is not toxic to aquatic organisms up to the limit of water solubility.
In addition, available data indicate, that the test substance is not
bioaccumulative. Based on the available information, toxicity to
sediment organisms is not expected to be of concern.
Intrinsic properties and fate
Fatty acids, C18-unsatd., dimers, 2-ethylhexylesters (CAS No.
68334-05-4) 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, 2012). Therefore, after passing through
conventional STPs, only low concentrations of these substances are
likely to be (if at all) released into the environment.
Furthermore, the substance exhibits a log Koc value of > 5 and is poorly
water soluble (< 1 mg/L). The Guidance on information requirements and
chemical safety assessment, Chapter R7.b (ECHA, 2012) 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, 2012)) and the rest
will be extensively biodegraded (due to ready biodegradability). 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 Fatty acids,
C18-unsatd., dimers, 2-ethylhexylesters in the sediment environment is
generally very low, which reduces the probability of chronic exposure of
sediment organisms in general.
Aquatic ecotoxicity data
Aquatic toxicity tests of the substance to fish, invertebrates, algae
showed no adverse effects occurred in the range of the water solubility
of the substance (< 1 mg/L). Furthermore, long-term data for algae and
fish show no chronic effects in the range of the water solubility. The
obtained results indicate that Fatty acids, C18-unsatd., dimers,
2-ethylhexylesters is likely to show no toxicity to sediment organisms
Bioaccumulation in sediment organisms is not expected for Fatty acids,
C18-unsatd., dimers, 2-ethylhexylesters. Based on the molecular weight
(673 g/mol), size and structural complexity of the substances, which
reduces significantly the absorption due to steric hindrance to cross
biological membranes, uptake from medium into sediment organisms is
considered to be low (e.g. Dimitrov et al., 2002).
The supporting BCF/BAF values estimated with the BCFBAF v3.01 program,
Arnot-Gobas model including biotransformation (BCF and BAF values of
0.89 L/kg and 0.89 L/kg, respectively), also indicate that this
substance will not be bioaccumulative (all well below 2000 L/kg).
Due to its readily biodegradable nature, extensive degradation of the
substance in conventional STPs will take place and only low
concentrations are expected to be released (if at all) into the
environment. Absorption of Fatty acids, C18-unsatd., dimers,
2-ethylhexylesters is not expected due to the molecular weight (673
g/mol), size and structural complexity of the molecules. Therefore, the
potential for bioaccumulation is low. Furthermore, aquatic toxicity data
show that no effects occur up to the limit of water solubility.
Therefore, the Fatty acids, C18-unsatd., dimers, 2-ethylhexylesters is
unlikely to pose a risk for sediment organisms in general and testing is
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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