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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 908-749-3 | CAS number: -
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
From the available water solubility study it can be concluded that the magnesium
oxide and magnesium peroxide present in 10 mg/L of the test substance hydrolyses within 24-48 hours, giving rise to the formation of hydrogen peroxide. The other components of the multi-constituent substance dissociate upon dissolving in the water phase.
Key value for chemical safety assessment
Additional information
The reaction mass of magnesium carbonate and magnesium hydroxide and magnesium oxide and magnesium peroxide will hydrolyze when it comes into contact with water. This property can be clearly demonstrated based on the results of the water solubility study. The water solubility was assessed via the flask method. Mixtures of water and the test substance in concentrations of 10, 100 and 1000 mg/L were stirred for 24, 48 and 96h. Subsequently, quantitative analyses of magnesium and hydrogen peroxide were performed.
The results of this experiment showed that:
1) The theoretical maximum concentration of magnesium is obtained within 24-48 hours in the 10 mg/L test solution. As a consequence, the water solubility of the reaction mass of magnesium carbonate and magnesium hydroxide and magnesium oxide and magnesium peroxide is > 0.01 g/L. but less than 0.1 g/L.
2) Hydrogen peroxide is being formed when the reaction mass of magnesium carbonate and magnesium hydroxide and magnesium oxide and magnesium peroxide is present in an aqueous environment.
In conclusion, in a 10 mg/L solution of the reaction mass of magnesium carbonate and magnesium hydroxide and magnesium oxide and magnesium peroxide in water, the following reactions occur:
* The magnesium peroxide and magnesium oxide hydrolyse within 24-48 hours.
* The magnesium hydroxide and magnesium carbonate are completely dissolved within 48 hours.
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.
