Registration Dossier
Registration Dossier
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EC number: 939-582-4 | CAS number: 1471315-26-0
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Fatty acids, C16-18 (even numbered), aluminum salts are not to be expected to inhibit aquatic mircroorganism.
Key value for chemical safety assessment
Additional information
No standard studies evaluating the effect of fatty acids, C16-18 (even numbered), aluminum salts, on respiration inhibition of aquatic microorganisms are available. Therefore, a ready biodegradability study is used to derive a NOEC for this endpoint. If a compound degrades well in a ready biodegradability test, or does not inhibit the degradation of a positive control at a certain concentration, this concentration can be used as a NOEC value. This approach is in accordance with the Guidance on information requirements and chemical safety assessment (Chapter R.7b: Endpoint specific guidance, ECHA 2008). A substance can be assumed to be not inhibitory to aquatic microorganisms if, in the toxicity control of a ready biodegradation test, more than 25% biodegradation occurs within a period of 14 days (OECD Guideline 301).
A biodegradation screening test according to OECD guideline 301 D is available for fatty acids, C16-18 (even numbered), aluminum salts (Peter Greven, 2013). This test includes a toxicity control containing 42.7 mg/L of test substance and reference substance (sodium benzoate). The degradation of fatty acids, C16-18 (even numbered), aluminum salts in the toxicity control after 14 days was 69.7% and after 29 day 84.6%. Based on the above information it is considered that fatty acids, C16-18 (even numbered), aluminum salts are not inhibitory to aquatic microorganisms and further testing for this endpoint is not necessary.
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