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Toxicity to microorganisms

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Description of key information

The 24 hour IC50 for nitrification is 13 mg/L.

Key value for chemical safety assessment

EC50 for microorganisms:
13 mg/L

Additional information

The most sensitive endpoint is reported by Blum and Speece (1991) for inhibition of nitrification. Although this study did not follow a standard guideline it is the most conservative endpoint reported and was used in the EU RAR for benzene (2008). It is therefore also used here to fulfil this endpoint.