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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

Fatty acids, C8-10, zinc salts:

Toxicity studies of fatty acids, C8-10, zinc salts are not available. Toxicity of octanoic acid, zinc salt, basic (CAS 90480-58-3) to the respiration of microorganisms was not observed in a guideline study with activated sludge (see Simon, 2012). Based on the lack of toxicity towards STP microorganisms, a similar low toxic potential may be assumed for soil microorganisms. Further, read-across to the assessment entities soluble zinc substances and fatty acids (C8-10) is applied since zinc cations and fatty acid anions (C8-10) determine its fate and toxicity in the environment. Please refer to the respective assessment entity for further details.

Fatty acids (C8-10):

Fatty acids as contained in plant and animal tissue are a natural component of soil, represent a significant part of the nutritional demands of soil microorganisms, are rapidly degraded and non-bioaccumulative and are therefore assumed to be of low toxic potential towards soil microorganisms.


For microbial assays, in total 108 individual high quality NOEC/EC10s  represent 4 nitrogen transformation processes, 5 carbon transformation processes and 8 enzymatic processes and range from 17 mg Zn/kg dw for respiration  to 2623 mg Zn/kg dw for phosphatase.

Key value for chemical safety assessment

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