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EC number: 500-148-0
CAS number: 61788-89-4
No long-term toxicity effects to sediment organisms are to be expected.
No long-term toxicity test with sediment organisms is available for
Fatty acids, C18-unsaturated, dimers (CAS No. 61788-89-4).
In accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5,
grouping of substance and read across approach, a structurally similar
substance with a similar ecotoxicological profile may be used to
determine possible effects to sediment organisms. One short-term study
investing the toxicity of Fatty acids, C18-unsaturated, trimers (CAS No.
68937-90-6) to marine sediment organisms (Corophium sp.) is available.
In this study, conducted according to OSPAR, Protocols on Methods for
the Testing of Chemicals Used in the Offshore Oil Industry, over 10 days
in natural sediment no effects were observed at 6095 mg/kg dry sediment
and a LC50 of > 12187 mg/kg dry sediment was determined (Staniland,
2005). Consequently, no effects are to be expected for Fatty acids,
C18-unsaturated, dimers (CAS No. 61788-89-4) either.
Additionally, as Fatty acids, C18-unsaturated, dimers (CAS No.
61788-89-4) has a very low water solubility (< 0.12 mg/L, detection
limit) exposure to the aquatic environment is expected to be extremely
low, if at all. Due to the adsorption potential of the substance (log
Koc ≥ 4), adsorption to organic carbon in soils and sediments can be
expected. Nevertheless, the substance will mostly be eliminated in the
sewage treatment plant (STP) as adsorption is likely to occur to the
sludge and hence the effluent, which is subsequently discharged from the
STP to the rivers should, if at all, have insignificant or negligible
quantities of the test substance.
Thus, due to the very low water solubility of Fatty acids,
C18-unsaturated, dimers (CAS No. 61788-89-4) sediments are not expected
to be the compartment of highest exposure. However if exposure does
occur, based on the lack of effects within the range of water solubility
in the short-term tests for all members of sub-category 2, the long-term
toxicity test with fish for Fatty acids, C18-unsaturated, dimers,
hydrogenated (CAS No. 68783-41-5), and the low toxicity to Corophium sp.
in a short-term toxicity test to Fatty acids, C18-unsaturated, trimers
(CAS No. 68937-90-6) long-term effects in sediment organisms are not
Thus, a long-term study with sediment organisms is not required.
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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