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Diss Factsheets

Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

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

Additional information

Acute toxicity

A report has been provided (Wetton, 1996) for one acute test with the earthwormEisenia foetida. The test fulfilled the criteria for acceptability for determining a PNEC. A 14-day LC50of 130 mg/kg dry weight was determined in the test.

The organic matter content of the soil used in the test 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 (3.4/10) is therefore applied, giving standardised results of: 

14-day NOECstandardised          = 34.0 mg/kg dry weight

14-day LC50standardised             = 44.2 mg/kg dry weight.

Long-term toxicity

A report has been provided (Servajean, 2004a)for a chronic test with the earthwormEisenia foetida. The test fulfilled the criteria for acceptability for determining a PNEC. A 57-day NOEC of 9.6 mg/kg dry weight was determined for effects on reproduction. A 28-day LC50of >100 mg/kg dry weight was also determined in the test.

The organic matter content of the soil used in the test 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 (3.4/10) is therefore applied, giving standardised results of: 

57-day NOECstandardised          = 3.3 mg/kg dry weight

24-day LC50standardised             = >34 mg/kg dry weight.