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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The EC50 for toxicity to STP microorganisms exceeded the highest test concentration of 1000 mg/L and the NOEC was 1000 mg/L, based on read across using sodium ferrocyanide as the source substance.

Key value for chemical safety assessment

EC50 for microorganisms:
1 000 mg/L

Additional information

The toxicity of Sodium ferrocyanide to STP microorganisms was determined in a 3 h activated sludge respiration inhibition study carried out according to OECD guideline No. 209 and GLP principles.

In a combined limit/range-finding test, microorganisms in activated sludge were exposed to the test substance at a concentration of 10, 100 and 1000 mg/L under static conditions. Under the chosen test conditions Sodium ferrocyanide did not significantly inhibited the respiration rate of waste water bacteria (activated sludge) at concentrations as high as 1000 mg/L. The EC50 exceeded the highest test concentration of 1000 mg/L and the NOEC was 1000 mg/L.

Although, not all criteria for acceptability of the test were fully met the test was still considered to be valid. The present toxicity study is classified as reliable without restrictions according to the OECD guideline No. 209.