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Toxicity to aquatic algae and cyanobacteria

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Experimental data on the toxicity of Fatty acids, C16-18 and C18-unsatd., hexaesters with dipentaerythritol (CAS 68604-38-6) to aquatic algae is not available. According to Regulation (EC) No 1907/2006, column 2, 9.1.2., short-term toxicity testing with aquatic algae does not need to be conducted if there are mitigating factors indicating that aquatic toxicity is unlikely to occur for instance if the substance is highly insoluble in water or the substance is unlikely to cross biological membranes. Fatty acids, C16-18 and C18-unsatd., hexaesters with dipentaerythritol (CAS 68604-38-6) is poorly soluble in water and has a high molecular weight (average of substance components: 1684 - 1853 g/mol) indicating that a crossing biological membranes is unlikely. Based on the available studies on aquatic toxicity effects to algae are not expected up to the limit of water solubility. Short-term toxicity testing with fish (Danio rerio) determined no acute toxicity of the substance up to the limit of water solubility (LL50 (96 h)> 100 mg/L; Caduff, 2012). The lack of aquatic toxicity was confirmed by a long-term toxicity study on survival and reproduction of Daphnia magna. Mortality or a significant effect on the number of produced offspring was not observed (NOEC (21 d) ≥ 100 mg/L; Caduff, 2013). Thus toxic effects of the substance to aquatic algae are not expected within the range of water solubility (WS < 0.15 mg/L) and therefore toxicity testing on aquatic algae is not proposed.