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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The respiration inhibition of alphamethylstyrene was investigated in a study conducted according to EU Method C.11 (Biodegradation: Activated Sludge Respiration Inhibition Test) and OECD Guideline 209 (Activated Sludge, Respiration Inhibition Test). The 3 h EC10, EC20, EC50, and EC100 were determined to be 661.5, 998.7, >2000, and >2000, respectively. 

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
661.5 mg/L

Additional information

Reliable results obtained in a guideline study are available. The respiration inhibition of alphamethylstyrene was investigated in a study conducted according to EU Method C.11 (Biodegradation: Activated Sludge Respiration Inhibition Test) and OECD Guideline 209 (Activated Sludge, Respiration Inhibition Test). The 3 h EC10, EC20, EC50, and EC100 were determined to be 661.5, 998.7, >2000, and >2000, respectively. The validity criteria were fulfilled (reference substance: sensitivity of the activated sludge was in the accepted range; individual respiration rates of the blanks were within 15% of each other).