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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Not acute toxic to bacteria.
NOEC (3h) < 125 mg/L
EC20 (3h) = 270 mg/L
3h EC50 > 2000 mg/L
EC10(16 h) = 2600 mg/L
EC50(16 h) = 7500 mg/L

Key value for chemical safety assessment

EC50 for microorganisms:
2 000 mg/L

Additional information

Two studies were determined. In the key study two valid experiments were performed:

First, a limit-test with two replicates using the nominal concentration 1,000 mg/L

The treatment 1,000 mg/L showed a mean inhibition of the respiration rate of the activated sludge of 31%.

Then, a main study was performed using five concentrations ranging from 2,000 to 125 mg/L.

The following inhibitions of the respiration rate of the activated sludge were detected: At 2000 mg/L 29.5 %, at 1000 mg/L 30.0 %, at 500 mg/L 24.5 %, at 250 mg/L 19.5 % and at 125 mg/L 15.8% inhibition were detected.

The following results for the test item were determined:

NOEC (3h) < 125 mg/L

EC20 (3h) = 270 mg/L (95% confidence interval: 110 - 430 mg/L)

EC50 (3h) > 2000 mg/L

In the supporting study the following values were determined:

EC10(16 h) = 2600 mg/L

EC50(16 h) = 7500 mg/L

The substance is not acute toxic for bacteria.