Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 254-671-1 | CAS number: 39881-32-8
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The test substance dibutylmagnesium was examined in a acute growth inhibition test for alga according OECD Guideline 201.The growth inhibitory ratio of Chlorella sp. indicated that the EC50 (72h) was greater than highest tested nominal concentration of 100 mg/L. Highest nominal concentration is equivalent to analytical meassured 47.19 mg/L.
Key value for chemical safety assessment
Additional information
This study was conducted to assess the acute toxicity of Dibutylmagnesium on single cell algae by observing acute inhibitory effects. The grow was observed and recorded at 24 h, 48 h and 72 h. Based on the results of preliminary test, the growth inhibitory ratio in solutions with 100 mg/L Dibutylmagnesium was 0.96% and below 50%, it was not necessary to conduct the definitive test.
Atomic absorption spectrometry of test solutions was used to generate standard curve to read substance concentration directly at the beginning and the end of test (c(48h)/c(0h) = 89.6%).
However, limit test with 3 replicates was carried out. The growth inhibitory ratio was -0.64% and indicated that the EC50 (72h) was greater than 100 mg/L, which is equivalent to measured 47.19 mg/L. Potassium dichromate was used as positive control. The calculated EC50 (72h) = 0.88 mg/L is in accordance with the accepted range of Guideline.Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
