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Toxicity to soil macroorganisms except arthropods

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Toxicity studies of zinc bis(2-ethylhexanoate) on soil macroorganisms except arthropods are not available. Thus, read-across to the assessment entities soluble zinc substances and 2-ethylhexanoic acid is applied since the ions of zinc bis(2-ethylhexanoate) determine its fate and toxicity in the environment.

Zinc: 37 NOEC/EC10 values are available for soil macroorganisms, covering 6 different worm species, and vary from 35.7 mg Zn/kg for Enchytraeus albidus to 1634 mg Zn/kg dw for Lumbricus terrestris.

2 -ethylhexanoic acid: Soil invertebrate toxicity data of 2-ethylhexanoate are not available and are not considered to be rquired for the following reasons: (i) significant adsorption to the solid soil phase is not expected, (ii) 2-ethylhexanoate is readily biodegradable, (iii) data on the toxicity to aquatic organisms point to a low toxic potential and (iv) available QSAR-based estimate for earthworms (ECOSAR, version 2.0) of 2-ethylhexanoic acid points to very low (if any) potential for toxicity to soil organisms. The respective 14-d LC50 value for earthworms is estimated with 1994 mg 2-Et/L and above the OECD limit of soil toxicity tests. Thus, 2-ethylhexanoate is not considered to have any potential for toxicity to soil organisms.

In sum, zinc bis(2-ethylhexanoate) seems to have some potential for toxicity to soil invertebrates.

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