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2-ethyl-2-[[(1-oxooleyl)oxy]methyl]-1,3-propanediyl dioleate (CAS-No. 57675-44-2) is assumed to be not harmful to aquatic organisms based on the results from short-term studies of different trophic levels (fish, daphnia, algae). All results show low toxicities far in excess of natural occurring concentrations (water solubility < 0.05 mg/L) with LC/EL50 > 100 mg/L.

Same observations could be reported for microorganisms, as no effects on respiration rate were observed after 3 h (EC50/ EC10 > 10000 mg/L) in a respiration inhibition test with activated sludge for 2-ethyl-2-[[(1-oxooleyl)oxy]methyl]-1,3-propanediyl dioleate (CAS-No. 57675-44-2). In addition, the biodegradation tests exhibit the readily biodegradability. Therefore, a disturbance in the biodegradation process of a sewage treatment plant is not anticipated.

Valid tests on the long-term toxicity to aquatic invertebrates and fish are not provided. However, a planned experimental study for long-term toxicity to aquatic invertebrates for Fatty acids, coco, triesters with trimethylolpropane (CAS-No. 85566-29-6) together with a 15 day-long-term study with Daphnia magna (Low, 1996) for the Polyol ester Decanoic acid, ester with 2-ethyl-2-(hydroxymethyl) -1,3-propanediol octanoate (CAS-No. 11138-60-6) will provide sufficient evidence for the chronic ecotoxicity of this substance. Fatty acids, coco, triesters with trimethylolpropane (CAS-No. 85566-29-6) was chosen as test substance for a long-term test for aquatic invertebrates, as this substance contains a great percentage of C12-Fatty acids, which is well known as the most harmful Fatty acid. Based on acute toxicity data, the fish is not expected to be more sensitive than aquatic invertebrates. Therefore and for animal welfare, no further long-term test with aquatic organisms is required for 2-ethyl-2-[[(1-oxooleyl)oxy]methyl]-1,3-propanediyl dioleate (CAS-No. 57675-44-2).