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Toxicity to microorganisms

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Description of key information

The inhibitory effect of the test item on the respiration rate of aerobic wastewater microorganisms of activated sludge was investigated in a 3-hour respiration inhibition test according to OECO Guideline for Testing of Chemicals, No. 209.The following nominal concentrations were tested: 10, 32, 100, 320, and 1000 mg/l. 
Up to and including the concentration of nominal 100 mg/L l the test item had no significant («15%) inhibitory effect on the respiration rate of activated sludge after the incubation period of three hours. At the higher test item concentrations of nominal 320 and 1000 mg/L the inhibitory effect increased to 24% and to 45%, respectively.

Key value for chemical safety assessment

EC50 for microorganisms:
1 250 mg/L
EC10 or NOEC for microorganisms:
148 mg/L

Additional information