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Toxicity to soil macroorganisms except arthropods

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Description of key information

With high probability acutely not harmful to soil macroorganisms.

Key value for chemical safety assessment

Additional information

Data on the toxicity to the earthworm Eisenia foetida of an analogous substance (EC 401-540-3) are available (CIBA-GEIGY 1990b) . With a LC0 greater than 1000 mg/kg dry weight of soil, this information demonstrates that the toxicity of the test substance and its analogy, respectively, to soil macroorganisms is very low.

The read-across substance (EC 401-540-3) has similar physicochemical, toxicological and ecotoxicological properties. It is also of low water solubility and degradation and hydrolysis are not likely. Due to the inert structure no break-down products will occur in the environmental compartments.

The read-across substance differs by a chlorine in para-position of both phenyl rings instead of a second phenyl ring. Therefore, the molecular diameter is slightly smaller. The common functional group is the 2,5 -dihydro-pyrrolo(3,4 -c)pyrrole-1,4 dione core. It is the chromophore that is both poorly soluble in organic and in inorganic solvents. It can be assumed based on the chlorines that the water solubility is predicted to be slightly better and a worst case substance has been tested.