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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

An EC50-value of >1000 mg /l was found when exposing active sludge to the test item Sodium Isobutyrate. The NOEC-value was determined to be >1000 mg /l.

Key value for chemical safety assessment

EC50 for microorganisms:
1 000 mg/L
EC10 or NOEC for microorganisms:
1 000 mg/L

Additional information

The effect of Sodium Isobutyrate solution on the respiration rate of activated sludge microorganisms, typical of those found in domestic sewage treatment, was determined in a respirometric test. The method used is based on the OECD 209 Test Guideline.

An EC50-value of 1000 mg /l was found when exposing active sludge to the test item Sodium Isobutyrate solution. Stimulation (negative value) is not a toxic effect. There was no statistical difference (Dunnett's test p>0,05) on the variable average respiration rate between the control and the test concentration 1000 mg /l, and therefore the NOEC-value is determined to be >1000 mg /l.

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