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In the assessment of the environmental toxicity of zinc dioctanoate, read-across to analogue substances and/or the assessment entities soluble zinc substances and octanoic acid is applied since the ions of zinc dioctanoate determine the environmental toxicity of zinc dioctanoate. Reliable data available for analogue substances, soluble zinc substances and octanoic acid indicate that the moiety of ecotoxicological concern are zinc cations. Aquatic toxicity data of octanoic acid point to a low toxic potential to aquatic algae and invertebrates. The ecotoxic potential of the fatty acid chain, i.e. octanoate, 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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