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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

ASRIT study with 3-PPB: EC50>1000mg/L and NOEC=1000mg/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

This new study was conducted to assess the effect of 3 -PPB on the respiration rate of activated sludge using the methods detailed in OECD Procedure 209 of the “Guidelines for Testing of Chemicals”: Activated Sludge, Respiration Inhibition Test (carbon and ammonium oxidation). Samples of activated sludge (suspended solids 1.6 g/L), fed with synthetic sewage, were exposed to dilutions of the test substance for three hours. Their rates of oxygen consumption were determined using oxygen electrodes and were compared with those of controls that contained activated sludge and synthetic sewage alone.