Registration Dossier
Registration Dossier
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EC number: 254-671-1 | CAS number: 39881-32-8
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
The test substance Dibutylmagnesium was examined in a respiration inhibition test with activated sludge according OECD Guideline 209. Under conditions the EC50 value of test item was determined as higher than 400 mg/L.
Key value for chemical safety assessment
Additional information
The activated sludge respiration inhibition test of Dibutylmagnesium was conducted. Therefore test item was given to activated sludge for 3 hours. Subsequently the respiration rate of 10 minutes was measured. The respiration rate was calculated from the recorder trace as mg O2/L. In order to calculate the inhibitory effect of a test substance the resperation rate was expressed as a percentage of the mean of the two control respiration rates. Corresponding to the observed concentrations (25, 50, 100, 200 and 400 mg/L Dibutylmagnesium) the respiration depression were 4.5%, 10.6%, 11.2%, 14.4% and 17.0%. The result showed that EC50 was greater than 400 mg/L. 3,5 -Dichlorphenol was used as positive control. The calculated EC50 (3 hours) = 10.6 mg/L and was in the accepted range from 5 to 30 mg/L.
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