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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

NOEC 1000 mg/L, EC50 > 1000 mg/L (loading rate), OECD 209, EU Method C. 11 and ISO 8192, Desmares-Koopmans 2013.

Key value for chemical safety assessment

EC10, LC10 or NOEC for microorganisms:
1 000 mg/L

Additional information

In the key study (Desmares-Koopmans, 2013) toxicity to microorganism was determined in an activated sludge respiration test conducted under GLP conditions and in accordance with standardised guidelines. Activated sludge of a predominantly domestic sewage treatment plant was exposed to the test material at a loading rates of up to 1000 mg/L for 3 hours under static conditions. Oxygen consumption was measured to determine the rate of respiration, where inhibition was determined relative to the blank control.

The test material was not completely soluble in test medium, test concentrations were therefore expressed as loading rates initially prepared.

Under the conditions of this test, the test material was not toxic to waste water (activated sludge) bacteria at loading rates up to 1000 mg/L. Therefore the NOEC was determined to be 1000 mg/L and the EC50 is considered to exceed a loading rate of 1000 mg/L.