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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Thiazol Blau showed 2.0 % respiration inhibition of activated sludge at a test item concentration of 1000 mg/L.
The EC50 is higher than 1000 mg/L.

Key value for chemical safety assessment

EC50 for microorganisms:
1 000 mg/L

Additional information

A study was performed to assess the toxicity of Thiazol Blau to bacteria.

The study was conducted in accordance with Council Regulation (EC) No 440/2008, Method C.11 ”Biodegradation: Activated Sludge Respiration Inhibition Test” (2008). This test method is equal to OECD Guideline 209 (1984).

The activated sludge was exposed to Thiazol Blau at different concentrations. The respiration rate of each mixture was determined after aeration periods of 3 hours.

Thiazol Blau showed 2.0 % respiration inhibition of activated sludge at a test item concentration of 1000 mg/L.

The EC50 is higher than 1000 mg/L.

The effect value relates to a nominal concentration, since no analytical monitoring was performed.