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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The IC50(3 h) of the test substance FAT 45176/A was > 320 mg/l.

Key value for chemical safety assessment

EC50 for microorganisms:
320 mg/L

Additional information

The toxicity of FAT 45176/A to activated sludge was determined in a 3-hours respiration inhibition test according to the OECD Guideline No. 209 and used as the key study. The test substance concentrations tested were 320, 100, 32 and 10 mg/l. The IC50(3 h) of the test substance FAT 45176/A was > 320 mg/l.

The inhibitory effect of FAT45'176/A on aerobic waste water microorganisms of activated sludge was investigated in a respiration test and used as the supportive study. This study examined nominal test article concentrations in the range from 3.2 mg/l to 100 mg/l. The respiration rate of aerobic waste water microorganisms was practically not inhibited (-3.8 to 4.9 %) when exposed to the test article concentrations in the range from 3.2 to 100 mg/l. The EC50 (30 minutes) was therefore determined to be >100 mg/l.