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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Under conditions of a respiration inhibition test, Reactive Red FC 73270 showed no inhibition of the activated sludge microorganisms at a concentration of 10,000 mg/L (NOEC) after 3h. The 3 -h EC50 is >10,000 mg/L.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
10 000 mg/L

Additional information

A study was performed to assess the toxicity of the test substance to bacteria, according to Commission Directive 88/302/EEC (Official Journal of the EC L133 Part C (1988)), which is largely equivalent to OECD guideline 209, in compliance with GLP.

The activated sludge was exposed to the test substance at different concentrations. The respiration rate of each mixture was determined after an aeration period of 3 h. The test substance showed no respiration inhibition to activated sludge at a concentration of 10,000 mg/L. The NOEC ofReactive Red FC 73270was determined to be 10,000 mg/L. An EC50 of the test substance could not be determined; however a hypothetical EC50 value would be >10,000 mg/L.