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Ecotoxicological information

Toxicity to microorganisms

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

The NOEC of 1560 mg/L for the toxicity of the analogue substance Fatty acids,C16-18, zinc salts to microorganisms is above the respective OECD test limit and the water solubility limit of zinc ditetradecanoate of 1.14 mg/L.

Fatty acids including myristic acid as contained in plant and animal tissue are a natural component of the environment, are rapidly degraded by microorganisms and therefore not expected to accumulate in the environment. Meat or vegetable extracts, containing C14-C22 saturated and unsaturated fatty acids, are added to the synthetic sewage feed at a concentration of 11 g /L according to the “activated sludge respiration inhibition test (OECD TG 209, 2010). Thus, available data indicate a low toxic potential of myristic acid to microorganisms. The ecotoxic potential of the fatty acid chain, i.e. myristate, 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)).

However, a NOEC of 100 µg Zn/L was generated in a test of nitrification inhibition of activated sludge by a soluble zinc salt. 

Thus, data available for analogue substances, soluble zinc substances and myristic acid indicate that the moiety of ecotoxicological concern are zinc cations.

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