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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

Key value for chemical safety assessment

Additional information

The Guidance on information requirements and chemical safety assessment, Chapter R.7C: Endpoint specific guidance (November 2014), section R. 7.11.6.3, Table R.7.11-2, page 145, specifies the information needed to waive the terrestrial studies based on soil hazard categories.

The log Pow of the registered substance is <3. Therefore, accumulation and persistence of the registered substance in soil and organisms is very unlikely. A PNEC soil was calculated using the aquatic PNEC and the equilibrium partitioning method. Based on these characteristics, the registered substance is not expected to cause adverse effects on terrestrial organisms and consequently terrestrial toxicity tests are not needed.

This is supported by a read across chronic earthworm study which demonstrates that the substance causes no relevant toxicity for terrestrial plants.

Nevertheless, a chronic earthworm study for a similar substance with a comparable ecotox profile (CAS 29857-13-4) was performed. This study was taken up in the evaluation of the registered substance (read across). However, since the EPM method revealed a more conservative result, this result was used to derive a PNEC soil. The acute data of the registered substance as well as of the read across substance (CAS 29857-13-4) demonstrate that in both substances algae are not the most sensitive organisms. This finding is also assumed to be true for the terrestrial compartment indicating that plants are not the most sensitive organisms. Therefore, a plant test is considered to be not relevant for the registered substance.