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Toxicity to microorganisms

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Description of key information

The effect of the test substance on oxygen consumption of microorganisms was performed according to OECD guideline 209 (BASF SE, 2009). No inhibitory effect on the respiration rate of activated sludge was observed (NOEC > 1000 mg/L).

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The effect of the test substance on oxygen consumption of activated sludge was performed according to OECD guideline 209. The test substance 2-[(2-methoxy-5-nitrophenyl)diazenyl]-N-(2-methoxyphenyl)-3-oxobutanamide was tested at nominal concentrations of 62.5, 125.0, 250.0, 500.0, and 1000 mg/L in a static setting. No inhibitory effect on the respiration rate of activated sludge after an incubation period of three hours was determined. The NOEC was > 1000 mg/L.