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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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In the assessment 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 its fate and toxicity in the environment.

Based on a reliable study with the analogue substance octanoic acid, zinc salt, basic, the lowest EL10 and EL50 amount to 0.02 mg/L and 0.16 mg/L WAF for the acute toxicity to freshwater algae (Pseudokirchneriella subcapitata), respectively. A similar potential for toxicity to Pseudokirchneriella subcapitata was observed for a zinc salt of a longer-chained (C8-10) fatty acid (EL10 = 0.03 mg/L WAF, EL50 = 0.20 mg/L WAF fatty acids, C8-10, zinc salts).

Furthermore, data available for 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. 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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