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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

From an EU review of studies to assess the impact of chromium (VI) and (III) on microbially-mediated soil processes a statistical assessment was carried out. A substantial amount of information is available for the toxicity of chromium (VI) to terrestrial organisms. In the environment, it is likely that chromium (VI) will be reduced to chromium (III) in soil, and it is also likely that such conversion would have taken place in many of the toxicity tests.

Key value for chemical safety assessment

Additional information

It is considered that an assessment factor of 1 is sufficient, hence the PNEC for soil processes with chromium (III) is 5.9 mg/kg.