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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The 3-h EC50 value is >100 mg/L in activated sludge from a municipal sewage treatment plant.

Key value for chemical safety assessment

EC50 for microorganisms:
100 mg/L

Additional information

The effect of EEA-NH4 on microorganisms was determined in a GLP-compliant study according to OECD guideline 209 (NOTOX, 2008).

In this limit test, microorganisms in activated sludge from a municipal sewage treatment plant receiving predominantly domestic sewage were exposed for 3 hours to 100 mg/L EEA-NH4 (in duplicate). The test solution was continuously aerated and stirried.

No significant inhibition (1%) of the respiration rate of the sludge was recorded at 100 mg/L EEA-NH4. Therefore, the EC50 of EEA-NH4 was determined at >100 mg/L (based on nominal concentrations).