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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
115.5 mg/L

Additional information

The toxicity of mesityl oxide to activated sludge has been investigated according to EOECD 209 guideline. Based on measured inhibition rates, the 3-hour EC10 and EC20 and their 95% confidence limits were determined. The determination of a 3-hour EC50 failed because up to the highest nominal test concentration of 1000 mg/L less than 50 % inhibition was noted after three hours incubation. Nevertheless, the 3-hour EC50 is clearly higher than 1000 mg/L under the present test conditions.