Registration Dossier
Registration Dossier
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EC number: 500-130-2 | CAS number: 55818-57-0
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Based on measured inhibition rates, the 3-hour EC20 was calculated as 64.6 mg/L. Based on measured inhibition rates, the 3-hour EC50 could not be quantified because up to the highest nominal test concentration of 1000 mg/L less than 50% inhibition was noted after three hours incubation.
Key value for chemical safety assessment
Additional information
The following results were obtained from a GLP study conducted according to OECD guideline 209: in comparison to the inoculum controls the respiration rate of the activated sludge was slightly inhibited by 4.8% at the lowest nominal test concentrations of 10 mg/L. At the next nominal concentrations 32 mg/L and 100 mg/L, the inhibition was 16.7% and 26.2%, respectively. At concentrations of 320 mg/L and 1000 mg/L, the respiration rate was moderately inhibited by 40.5%. Concentrations exceeding 1000 mg/L (nominal) were not tested.
Based on measured inhibition rates, the 3-hour EC20 was calculated as 64.6 mg/L. Based on measured inhibition rates, the 3-hour EC50 could not be quantified as less than 50% inhibition was measured up to the highest test concentration (1000 mg/L).
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