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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

A short-term and a long-term toxicity test with the earthworm Eisenia foetida were available.  The tests fulfilled the criteria for acceptability for determining each PNEC respectively. The results were:
Short-term:
14-day LC50standardised 33.0 mg/kg dry weight.
14-day NOECstandardised 10.9 mg/kg dry weight
Long-term:
56-day NOECstandardised 18.02 mg/kg dry weight

Key value for chemical safety assessment

Short-term EC50 or LC50 for soil macroorganisms:
33 mg/kg soil dw
Long-term EC10, LC10 or NOEC for soil macroorganisms:
18.02 mg/kg soil dw

Additional information

A short-term and a long-term toxicity test with the earthworm Eisenia foetida were available. The tests fulfilled the criteria for acceptability for determining each PNEC respectively. A 14-day LC50 of 97 mg/kg dwt has been determined in the test along with a 14-day NOEC of 32 mg/kg dwt. A 56-day NOEC (28-day adult plus 28-day juvenile exposure period) of 53 mg/kg dwt for earthworm reproduction has been determined in the test.

The organic matter content was approximately 10% (sphagnum moss peat 10% w/w dry weight of test soil). Therefore the results need to be corrected to obtain a result relevant for natural soils, containing a TGD default of 3.4% organic matter. A correction factor of 0.34 is therefore applied, giving standardised results of:

14-day LC50standardised 33.0 mg/kg dry weight

14-day NOECstandardised10.9 mg/kg dry weight

56-day NOECstandardised18.02 mg/kg dry weight