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Toxicity to soil microorganisms

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Fatty acids, C14-18 and C16-18-unsatd., zinc salts:

Data on the toxicity to soil microorganisms are not available for Fatty acids,C14-18 and C16-18-unsatd., zinc salts. Thus, read-across to the assessment entities soluble zinc substances andC14-18fatty acids is applied, since zinc cations and fatty acid anions determine its fate and toxicity in the environment. Since C14-18-satd. and C16-18-unsatd. fatty acids have a low potential for ecotoxicity, the hazard assessment of Fatty acids, C14-18 and C16-18-unsatd., zinc salts is based on zinc ions. Please refer to the endpoint summary of the respective assessment entity for further details.

 

Fatty acid anions (C14-18-satd. and C16-18-unsatd.):

Fatty acids as contained in plant and animal tissue are a natural component of soil, are rapidly degraded and non-bioaccumulative and have a low ecotoxic potential, including toxicity to microorganims. Available data indicate a low toxic potential of fatty acids to aquatic microorganisms. Based on the absence of a hazard potential in the aquatic compartment, a similar low potential is also assumed for soil microbes.

 

Zinc:

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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