Registration Dossier
Registration Dossier
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EC number: 439-790-0 | CAS number: 292605-05-1
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
The acute toxicity of the test substance, Vivaldie, on the respiration of activated sewage sludge was evaluated using a 3 -hour static test according to OECD Guideline 209. The substance was tested in final concentrations of 1, 3.16, 10, 31.6 and 100 mg/L. The oxygen consumption of these solutions was measured for approximately 10 minutes, with a chart recorder, after an aeration of 3 hours. The EC50 (concentration expected to cause 50% inhibition of the respiration rate) of the test substance and the reference substance was determined considering the oxygen consumption of the controls as 100%. As the validity criteria were met (the difference between the two controls was below 15% and the EC50 of 3,5-dichlorophenol was between 5 and 30 mg/L), the test was considered valid. The respiration rate of the test solution of highest concentration (100 mg/L) was equivalent to the respiration rate of the first control (i.e. these rates were within 15% of each other). Therefore, the oxygen consumption rate of the four other test solutions (1 to 31.6 mg/L) was not determined. The 3 hour EC50 value (mg/L) for vivaldie was determined to be > 100 mg/L. The test substance should be considered as non-toxic for the micro-organisms of a water treatment plant.
Key value for chemical safety assessment
- EC50 for microorganisms:
- 100 mg/L
Additional information
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