Registration Dossier
Registration Dossier
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EC number: 214-447-6 | CAS number: 1129-42-6
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
No inhibition of nitrification. EC50 (4 h): > 100 mg/L (EN ISO 9509)
Key value for chemical safety assessment
Additional information
A test on inhibition of nitrification of activated sludge microorganisms by 6-methyl-2-oxoperhydropyrimidin-4-yl urea is available (Bachner M., 2004). The study was conducted following the method described in EN ISO 9509. Domestic activated sludge was incubated with the substance for four hours. The nitrification rate was assessed by measuring the nitrate and nitrite concentration after the exposure period. The tested substance concentrations caused no nitrification inhibition. The determined EC50 after four hours was >100 mg/L based on the nominal substance concentration.
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