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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

No effects up to the limit of water solubility (WS 0.1 mg/L)

Key value for chemical safety assessment

Additional information

No experimental data evaluating the acute toxicity of isooctadecanoic acid, mono- and diester with glycerol (CAS No. 97358-80-0) to fish species are available.Therefore, toxicity data from a structurally related analogue substance, castor oil hydrogenated (CAS No. 8001-78-3) are used as read-across in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5. Both substances are esters formed from the combination of C18 fatty acids and glycerol as alcohol component. The behaviour of these substances in the water phase is expected to be very similar based on low water solubility values (0.01 and < 0.05 mg/L for target and source substance, respectively) and log Pow (> 6). Based on this information, reading-across from castor oil hydrogenated to isooctadecanoic acid, mono- and diester with glycerol is justified.

 

A study was conducted with castor oil hydrogenated (CAS No. 8001-78-3) according to ISO 7346-1. Fish (Danio rerio) were exposed for 96 hours to the test substance within a semi-static water regime, at nominal concentrations of 1000, 3000 and 10000 mg/L. No mortality was observed at any of the tested concentrations and therefore the LC50 (96 h) was determined to be > 10,000 mg/L (nominal concentration).

 

Based on the results obtained for the structurally related analogue substance (in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5), no acute toxicity of isooctadecanoic acid, mono- and diester with glycerol to fish species up to the limit of its water solubility (0.1 mg/L) is expected.