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Short-term toxicity to aquatic invertebrates

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Description of key information

No acute toxicity effects to aquatic invertebrates are expected up to the limit of water solubility (<0.41 mg/L).

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Additional information

Three studies investigating the short-term toxicity of Fatty acids, C18-unsaturated, dimers (CAS No. 61788-89-4), Fatty acids, C16-18 and C18-unsaturated, branched and linear (CAS-No. 68955-98-6), and Fatty acids, C18-unsaturated, trimers (CAS No. 68937-90-6) to aquatic invertebrates were used as read across in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5., grouping of substance and read across approach. For Fatty acids, C16-18 and C18-unsaturated, dimerized (CAS No 71808-39-4), “Crude dimer” no study is available.

A limit test investigating the short-term toxicity of Fatty acids, C18-unsaturated, dimers (CAS No. 61788-89-4) to Daphnia magna was conducted as part of the US HPV program (Kelly, 2002). In this GLP-study according to OECD 202 (1984) no effect on immobilisation was observed at the tested WAF loading rates (NOELR > 1000 mg/L nominal). Furthermore, a short-term toxicity test with the marine crustacean Acartia tonsa using Fatty acids, C18-unsaturated, trimers (CAS No. 68937-90-6) resulted in an LL50 of > 1000 mg/L nominal (based on WAF loading rates) (Källqvist 2004). In a further acute immobilisation test with Daphnia magna using Fatty acids, C16-18 and C18-unsaturated, branched and linear (CAS No. 68955-98-6), conducted with WAFs, an EL50 >1000 mg/L and a NOELR > 1000 mg/L were determined.

The water solubility of the substances in the category is very low (<0.52 mg/L; with the exception of the monomer having a higher water solubility). All short-term tests carried out did not show any effects within the water solubility of these tested substances. Thus, it is assumed that due to structural similarities of the category members this applies also to Fatty acids, C16-18 and C18-unsaturated, dimerized (CAS-No. 71808-39-4).