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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 appropriately low concentrations.

Key value for chemical safety assessment

EC50 for microorganisms:
171.4 mg/L

Additional information

Experimental data on the toxicity of Mochon roh to aquatic microorganisms are not available. Therefore, the assessment is based on experimental data for the 4 -methoxycyclohexanone (CAS 13482 -23 -0) and 4 -methoxyphenol (CAS 150 -76 -5). 4-Methoxycyclohexanone (CAS 13482-23-0) showed a 3-h IC50 of > 10000 mg/L in an activated sludge respiration inhibition tests according to OECD 209 (ECHA disseminated data; query date: 2018-05-15). The effects of 4-Methoxyphenol (CAS 150-76-5) on aquatic microorganisms were investigated in a non-guideline growth inhibition test withTetrahymena pyriformis. The 40-h IGC50 was 174 mg/L (nominal; ECHA disseminated data, query date: 2018-05-28).

Based on available data, it can be concluded that the inhibition of the degradation activity of activated slude is not anticipated when introduced in appropriately low concentrations.