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Toxicity to aquatic algae and cyanobacteria

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Description of key information

EL50 (72 h)> 0.264 mg/L (measured)(Desmodesmus subspicatus, EU Method C.3)
EL50 (72 h)> 100 mg/L (nominal)(Desmodesmus subspicatus, EU Method C.3)

Key value for chemical safety assessment

Additional information

No experimental data evaluating the toxicity of Glycerides, C8-21 and C8-21-unsaturated, mono- and di-, acetates (C10)(CAS No. 97593-30-1) to algae are available. Therefore, read-across data from a structurally related category member, Glycerides, C8-21 and C8-21-unsaturated, mono- and di-, acetates (C12)(CAS No. 97593-30-1) is used in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5. Both substances are esters formed from the combination between acetylated fatty acids and glycerol as alcohol component. These two substances are structurally identical except for the length of their main fatty acid component (being either C10 or C12).The behaviour of these substances in the water phase is expected to be very similar based on their water solubility values (10.2-24.6 mg/L for the C10 and 3.5-21.9 mg/L for the C12 substances, respectively) and log Pow (> 4).

A study evaluating the toxicity of Glycerides, C8-21 and C8-21-unsaturated, mono- and di-, acetates (C12)(CAS No. 97593-30-1) to algae is available (Weyers, 2007). This test was conducted according to EU method C.3 (Algal Inhibition test), under GLP conditions.Desmodesmus subspicatuswas exposed to the test substance for 72 hours at 23 ± 2°C. After the exposure period, no effects on algal biomass or growth rate were reported at any of the concentrations tested. Therefore, the EL50 (72 h) is > 0.264 mg/L (measured concentration).

Based on the results obtained for the structurally similar analogue substance (in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5) no effects up to the maximum achievable concentration in test medium are expected for Glycerides, C8-21 and C8-21-unsaturated, mono- and di-, acetates (C10).