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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
toxicity to soil macroorganisms except arthropods: long-term
Data waiving:
other justification
Justification for data waiving:
other:

Description of key information

Key value for chemical safety assessment

Additional information

The registered substance is an ionic substance, has a log Pow of <3 and exhibited a significant level of biodegradation in a ready biodegradability test, both under standard conditions (53.4% in 28 days) and under enhanced ones (70.8% in 60 days). Accumulation in soil organisms and persistence in soil compartment are therefore very unlikely. The substance has a low ecotoxicity since the aquatic EC50/LC50 for algae, daphnia and fish are >>1mg/L. Based on that information, the substance is in the terrestrial "hazard category 3" according to guidance R.7c Table R.7.11-2 (2017).


Based on the available data, a PNEC value for soil can be calculated using the PNEC freshwater and the equilibrium partitioning method. In addition, information from a long-term earthworm study was added as supporting read across information. Read across is considered relevant and reliable since the aquatic ecotoxicity for the target substance is much lower then the corresponding ecotoxicity of the source substance.


The EPM in combination with the applied additional safety factor of 10 (as recommended for "hazard category 3" substances) resulted in a PNEC soil value (=PNEC screen) more conservative than the PNEC soil value calculated with the long-term study. As a result, the risk assessment was based on the PNEC screen. Based on this approach, the registered substance is not expected to cause a risk to terrestrial organisms ([PEC x 10/PNEC screen]<1) and consequently terrestrial toxicity tests are not needed for the registered substance.