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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 630-337-4 | CAS number: 39211-00-2
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
Cesium tetrafluoroaluminate completely dissociates to Cs, Al and F-ions at pH4 and unadjusted pH. At neutral and alkaline pH, hydrolysis is observed under formation of aluminium fluoride or aluminium hydroxyfluoride precipitates.
Key value for chemical safety assessment
Additional information
Based on its chemical structure, cesium tetrafluoroaluminate is easily dissociated into various ions in water. This is supported by a reliable key study on water solubility and stability of cesium tetrafluoroaluminate determined as function of time and pH. Although the study was not performed according to GLP criteria or normalised testing guideline, the results are considered adequate for assessment. In native and acidi c solution there is no remarkable evidence of hydrolysis, being the mol ration of Cs, Al and F in solution close to the theoretical 1:1:4 of CsAlF4. Cesium tetrafluoroaluminate will most probably mainly dissociate into Cs+ and AlF4 -. In neutral and alkaline environment a gel-like residue is formed which could not be separated from the solution. The XRD results and the mol ration indicate that in alkaline solution AlF4 -, AlF52- and F- as anions and as cations Cs+ and Al+ appear. The reduced aluminium content in the clear pH 9 solution may probably result from a precipitation of aluminium fluoride or aluminium hydroxyfluoride.
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.
