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Toxicity to aquatic algae and cyanobacteria

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Description of key information

No effects up to the limit of water solubility are expected.

Key value for chemical safety assessment

Additional information

Studies are available for some pure homologue members of the fatty acid category. In addition some studies are available for certain fatty acid mixtures. Generally it could be stated that toxicity of fatty acids to aquatic organisms increases with increasing chain length up to the water solubility limit at a chain length of C12. For longer chains no effects at saturation are observed.

As for fatty acids, C16 -22 (CAS 68002 -88 -0), no study is available, a read-across is performed to palmitic acid (C16). Palmitic acid (C16: CAS 57 -10 -3) was tested on Pseudokirchneriella subcapitata as well under OECD 201 in a GLP-study (NITE, 2003b).One test substance concentration was used (10 mg/L nominal, corresponding to 0.9 mg/L initial mean measured), which was above the reported water solubility limit for this substance (< 0.05 mg/L according to the category justification). As no effects could be observed at this test concentration, the EC50 for growth rate is reported to be above 0.9 mg/L (initial mean measured).

From the reported results of the test available for the fatty acid homologue C16 no adverse effects of the considered fatty acid are expected on algae. In the cited test no effects up to the water solubility limits of the pure homologues were reported. Thus for the considered fatty acid no effects within the range of water solubility is expected.