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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Aquatic toxicity studies with zinc didocosanoate are not available. In the assessment of zinc didocosanoate, read-across to analogue substances and/or the assessment entities soluble zinc substances and docosanoic/behenic acid is conservatively applied since the ions of zinc didocosanoate determine its fate and toxicity in the environment.

The EC50 for the acute toxicity of the analogue substance Fatty acids, C16-18, zinc salts to Daphnia magna is > 100 mg/L, respectively, and thus above the water solubility limit of zinc didocosanoate of 1.1 microg/L. A similar low potential is assumed for zinc didocosanoate, a longer-chained fatty acids (C22) with a lower zinc content and solubility.

Further, data available for soluble zinc substances and behenic acid indicate that the moiety of ecotoxicological concern are zinc cations. Aquatic toxicity data of behenic acid point to a low toxic potential to aquatic invertebrates. The ecotoxic potential of the fatty acid chain, i.e. behenate, is assumed to be negligible. Fatty acids are generally not considered to represent a risk to the environment, which is reflected in their exclusion from REACH registration requirements (c.f. REACH Annex V (Regulation (EC) No 987/2008)).

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