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Toxicity to microorganisms

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Description of key information

The 3-hour EC50 of manganese ferrite was >/= 10000 mg/L on activated sludge, related to respiration rate.

Key value for chemical safety assessment

EC50 for microorganisms:
10 000 mg/L

Additional information

Should read >/= 10000 mg/L.

A defined quantity of activated sludge is fed with a synthetic nutrition medium and the respiration rate is measured. This respiration rate is compared with those, measured in various test preparations containing different concentrations of the test item. The sensitivity of the used activated sludge is checked with 3,5-Dichlorophenol as reference item.

The 3-hour EC50 of manganese ferrite was >/= 10000 mg/L on activated sludge, related to respiration rate. The method used was the OECD Guideline 209.

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