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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The effect of the test material on the respiration of activated sewage sludge gave a 3-Hour EC50 of >1000 mg/L.

Key value for chemical safety assessment

EC50 for microorganisms:
1 000 mg/L

Additional information

Methods

A study was performed to assess the effect of the test material on the respiration of activated sewage sludge. The method followed that described in the OECD Guidelines for Testing of Chemicals No. 209 "Activated Sludge Respiration Inhibition Test".

Procedure

The test material was aerated for a period of 3 h at 21°C in the presence of activated sewage sludge with the addition of a synthetic sewage as a respiratory substrate. The rate of respiration was determined after 30 min and 3 h contact time and compared to data for the control and a reference material, 3,5-dichlorophenol.

Results

The effect of the test material on the respiration of activated sewage sludge gave a 3-Hour EC50of greater than1000 mg/L.

The positive control, 3,5 -dichlorophenol gave a 3 -Hour EC50 of 8 mg/L.