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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Based on read across, the acute toxicity of (benzoato-O,O')hydroxy(octadecanoato-O,O')aluminium to Daphnia is predicted to show  no effects at a water accommodated fraction nominal loading rate of 100 mg/L. Therefore, the 48 hour EL50 is determined to be > 100 mg/L (WAF).

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
100 mg/L

Additional information

As no data was available for the short-term toxicity to aquatic invertebrates of (benzoato-O,O')hydroxy(octadecanoato-O,O')aluminium, the endpoint was read across from aluminum, benzoate C16-18-fatty acids complexes.The acute toxicity of the read across substance to Daphnia was determined in a proprietary, GLP-compliant, static limit test (Harlan 2013) following OECD guideline 202. As no effects were observed in the preliminary range finding test, the definitive toxicity to Daphnia test was conducted as a limit test at a nominal loading rate of 100 mg/L alongside a blank control. Twenty Daphnia divided into four replicates were exposed to a water accommodated fraction of aluminum, benzoate C16-18-fatty acids complexes for 48 hours in standard ecotoxicity media adjusted to a hardness of approximately 150 mg/L CaCO3. Observations of immobilisation or abnormalities of behaviour or appearance of the Daphnia was made at 24 and 48 hours and the test solution analysed for aluminium content and total organic carbon at test initiation and termination. As no effects were observed, the 48 hour EL50 is determined to be > 100 mg/L (WAF).

Aluminum, benzoate C16-18-fatty acids complexes (CAS No. 94166-87-7, EC No. 303-385-6) is considered suitable for read across to (benzoato-O,O')hydroxy(octadecanoato-O,O')aluminium as it is structurally similar being an approximate 2:1 mixture of (benzoato-O,O')hydroxy(octadecanoato-O,O')aluminium and (benzoato-O,O')hydroxy(hexadecanoato-O,O')aluminium. The only significant difference is the presence of about 30% of the aluminium complex containing the saturated C16-fatty acid, hexadecanoate, in place of the saturated C18-fatty acid, octadecanoate. This small difference in composition is expected to have no adverse influence on the short-term toxicity to aquatic invertebrates.