Registration Dossier
Registration Dossier
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EC number: 941-981-3 | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
No toxic effects on aquatic algae up to the limit of water solubility, read across.
Key value for chemical safety assessment
Additional information
Data on the acute toxicity of the target substance Fatty acids, C18 unsaturated, ethyl & methyl esters (EC 941-981-3) to aquatic algae are not available. The assessment was therefore based on studies conducted with the structurally similar substance Fatty acids, C16-18 and C18-unsatd., iso-Bu esters (CAS 84988-79-4) as part of a read across approach, which is in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5. Further justification is given within the overall summary chapter 5.1 and within the analogue justification section 13.
The available study conducted with Fatty acids, C16-18 and C18 unsaturated isobutyl esters (CAS 84988-79-4) was performed as a limit test according to the EU guideline 92/69/EWG and GLP (Berger, 1995). The test organism Scenedesmus subspicatus was exposed to the test substance in a static system for 72 hours, at the nominal test concentration 100 mg/L. The test was performed with and without separation of undissolved test material. With undissolved test substance present, algal growth was significantly inhibited. However, when the undissolved phase was separated, no effects on growth were observed. The observed inhibition was thus presumably triggered by physical effects of the undissolved material. Toxic effects of the substance on Scenedesmus subspicatus within the range of water solubility are therefore unlikely.
Based on the results from three structurally related read-across substance (in accordance to Regulation (EC) No 1907/2006 Annex XI, 1.5), characterized by a similar ecotoxicological profile and comparable structure, it can be concluded that Fatty acids, C18 unsaturated, ethyl & methyl esters (EC 941-981-3) is not toxic to algae up to the limit of water solubility.
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