Registration Dossier
Registration Dossier
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EC number: 211-792-4 | CAS number: 696-29-7
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
A Respiration Inhibition Test with activated sludge according to OECD Guideline No. 209 was carried out with the test item Hydrocumene. Test system was activated sludge of the municipal treatment plant of 31137 Hildesheim, Germany. The test was carried out under static conditions with the substance concentrations of 560 - 750 - 1000 mg/L in a geometrical series with a dilution factor of 1.33. The respiration rates of the control, reference and test item replicates were measured after a contact time of three hours, and the inhibitory effects of the test and reference item were determined in comparison to the control respiration rates. The mean inhibition of respiration for the test item replicates ranged from -3 % to 3 %.
The NOEC of the test item Hydrocumene is 1000 mg/L and the EC50 (3 h) is > 1000 mg/L. The test item is not toxic at the concentration of 1000 mg/L to activated sludge of a municipal sewage treatment plant.
Key value for chemical safety assessment
- EC50 for microorganisms:
- 1 000 mg/L
Additional information
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