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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.

Key value for chemical safety assessment

Additional information

In a short-term respiration test using domestic activated sludge (BASF AG, 1980) a 30-min EC20 of > 1000 mg/L was determined. Hence, the EC50 is also > 1000 mg/L.

The nominal concentration of 1000 mg/L was not analytically verified, but is assumed to be stable due to the the low n-octanol/water partition coefficient (log Kow = 0.21), the high water solubility (WS = 1.0E+06 mg/L at 23 °C), the moderate vapour pressure (VP = 2 hPa, at 22.4 °C) and the low Henry´s law constant (HLC, uncharged: 3.17E-04 Pa*m³/mol) of the chemical. In addition, a test on short-term toxicity to fish conducted according to APHA (1980) standard methods for the examination of water and waste water which are similar to OECD 203 testing guideline (Geiger et al., 1986), as well as a further test on short-term toxicity to aquatic invertebrates according to OECD 202 (Atofina, 1993) showed an acceptable recovery of the test item in the test solutions.