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Diss Factsheets

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

The toxicity to aquatic microorganisms was studied in an activated sludge respiration inhibition test. In this test, which was performed according to ISO guideline 8192 (issued in 1986), 5 different concentrations (1.0, 1.8, 3.2, 5.6, and 10 g/L) as well as a positive control (3,5-dichlorophenol) were tested.      

Key value for chemical safety assessment

EC50 for microorganisms:
10 000 mg/L

Additional information

The inhibition of respiration of activated sludge at test concentrations ranging from 1000 to 10000 mg/Lwas determined in a valid study in accordance with ISO 8192 -1986. Activated sludge was taken from a laboratory sewage treatment plant. The EC50 was determined to be > 10000 mg/L as only 37% inhibition was observed at 10000 mg/L. No NOEC could be determined as the lowest tested concentration of 1000 mg/L showed an inhibition of 10.4%.