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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

The selected NOEC and EC10 values on functional parameters vary from 96 to 4144 mg Pb/kg (both values observed for respiration).  Additionally,  NOEC or EC10 values are selected for different enzyme assays, ranging from 132 mg Pb/kg for dehydrogenase to 16576 mg Pb/kg for phosphatase.

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for soil microorganisms:
96 mg/kg soil dw

Additional information

There are 4 reliable NOEC or EC10 values selected for different functional parameters for microbial processes. The functional parameters comprise C- and N-mineralization. The selected NOEC and EC10 values on functional parameters vary from 96 to 4144 mg Pb/kg (both values observed for respiration). Additionally, NOEC or EC10 values are selected for different enzyme assays, ranging from 132 mg Pb/kg for dehydrogenase to 16576 mg Pb/kg for phosphatase. The ecological relevance of reduced enzymatic activities is unclear and, therefore these data re not used for PNEC calculation, but only presented as supporting evidence.