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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

Key value for chemical safety assessment

Additional information

Soil microbial process tests evaluate the native soil microbial communities exposed to the substance. From the database of cobalt toxicity to micro-organisms, there are 28 individual high quality NOEC/EC10 values evaluating 3 functional parameters (potential nitrification rate, glucose induced respiration and maize residue mineralization) from 10 natural soils collected from sites in Europe and North America. When expressed as added soil Co, these endpoints range from 5.5 mg Co/kg dw for Glucose induced respiration (Salpeteur et al, University of Leuven, 2007) to 4695 mg Co/kg dw for Maize residue respiration (Salpeteur et al, University of Leuven, 2007). Below are the accepted high quality studies for soil microorganisms used for derivation of the HC5 and terrestrial PNEC.

 

Table X. High quality studies for soil microorganisms used for derivation of the HC5 and soil microorganism PNEC

Key Study

 

Selected values for the most sensitive endpoints used for derivation of the soil microorganism HC5

Species

Added NOEC or EC10 (mg Co/kg dw)

Total NOEC or EC10 (mg Co/kg dw)

Salpeteur et al, University of Leuven, 2007

Potential nitrification rate

22.3-695

23.1-725

Glucose induced respiration

5.5-602

6.3-606

Maize residue mineralization

35.6-4685

37.2-4696

Long-term EC10/LC10 or NOEC for soil microorganisms: 5.5 -4685 mg/kg soil dw (added Co).