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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The effect of the test item on the respiration of activated sewage sludge gave a 3-Hour EC50 value of 230 mg/L. A No Observed Effect Concentration (NOEC) was not identified.

Key value for chemical safety assessment

EC50 for microorganisms:
230 mg/L

Additional information

A study was performed to assess the effect of the test item on the respiration of activated sewage sludge. The method followed was designed to be compatible with the OECD Guidelines for Testing of Chemicals (2010) No. 209 "Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation)".

Following a preliminary range finding study activated sewage sludge was exposed to an aqueous dispersion of the test item at concentrations of 100, 180, 320, 560 and 1000 mg/L (3 replicates) for a period of 3 hours at a temperature of approximately 20 to 22°C with the addition of a synthetic sewage as a respiratory substrate. The rate of respiration was determined after 3 hours contact time and compared to data for the control and a reference item, 3,5-dichlorophenol.

The reference item gave a 3 -hour EC50 value of 7.6 mg/L (95% confidence limits of 6.0 - 9.7 mg/L)

The effect of the test item on the respiration of activated sewage sludge gave a 3-Hour EC50 value of 230 mg/L. A No Observed Effect Concentration (NOEC) was not identified.