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The aquatic toxicity of fatty acids has been evaluated in studies on fish, daphnids and algae as well as microorganisms. Most of the studies were conducted with fatty acid homologues. Most tests are available for the soluble octanoic acid C8 (CAS 124 -07 -2), the azelaic acid C9 (CAS 123 -99 -9), the decanoic acid C10 (CAS 334 -48 -5) and the lauric acid C12 (CAS 143 -07 -7). In addition some studies were conducted with the insoluble pure homologues myristic acid C14 (CAS 544 -63 -8), palmic acid C16 (CAS 57 -10 -3) and stearic acid C18 (CAS 57 -11 -4) and certain mixtures.

In case of the mixture fatty acids, hydrogenated tallow, distn. residues (CAS 70084 -85 -4) read across is performed to the homologues C16 and C18, which are the main components of the substance (content of C16: 5 - 35% and content of C18: 25 -65%).

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 the considered mixture contains only poorly soluble homologues, for which absence of acute and chronic effects on aquatic organisms was demonstrated in several tests, no risk for fish, daphnids and algae, as well as microorganisms is expected.