Registration Dossier
Registration Dossier
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EC number: 217-420-7 | CAS number: 1843-03-4
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
In the combined limit/range-finding test no statistically significant inhibition of the respiration rate of the sludge was recorded at a loading rate of 1000 mg 6,6’-di-tert-butyl-4,4’-butylidenedi-m-cresol per litre (Two Sample t-Test : α=0.05 Toxstat).
There was no significant oxygen uptake from abiotic processes and the results at 1000 mg/l with a nitrification inhibitor showed that the heterotrophic inhibition of the respiration rate was comparable to the total inhibition.
Key value for chemical safety assessment
- EC50 for microorganisms:
- 1 000 mg/L
- EC10 or NOEC for microorganisms:
- 1 000 mg/L
Additional information
Under the conditions of this present test 6,6’-di-tert-butyl-4,4’-butylidenedi-m-cresol was not toxic to waste water (activated sludge) bacteria at or below a loading rate of 1000 mg/l (NOEC).
The EC50exceeded a loading rate of 1000 mg/l.
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