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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 235-487-0 | CAS number: 12251-53-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Sodium aluminate is stable only under alkaline conditions and decomposes rapidly under environmental conditions to aluminium hydroxide in aquatic system or deposits as aluminium oxide (gibbsite) in sediment or soil, whereas due to their high solubility, sodium ions transfer to soil water that is why sorption to soil particles will be negligible.
Both aluminium hydroxide and oxide are insoluble under normal environmental conditions in the range of pH 5 – 8. Thus, they precipitate and subsequently are immobilised in soil and sediment.
Key value for chemical safety assessment
Additional information
Sodium aluminate is stable only under alkaline conditions and decomposes rapidly under environmental conditions to aluminium hydroxide in aquatic system or deposits as aluminium oxide (gibbsite) in sediment or soil, whereas due to their high solubility, sodium ions transfer to soil water that is why sorption to soil particles will be negligible.
Both aluminium hydroxide and oxide are insoluble under normal environmental conditions in the range of pH 5 – 8. Thus, they precipitate and subsequently are immobilised in soil and sediment. However, the surface chemical behaviour of aluminium oxides and hydroxides indicates that the hydrolysis and precipitation process of aluminium hydroxide and oxide in the aquatic and terrestrial compartments is more complicated. The relative mobility of aluminium hydroxide and oxide, as well as the other aluminium species, depend upon on many factors, especially pH, alkalinity, temperature, dissolved organic carbon, dissolved inorganic carbon and anion concentration. Kaplan (2005) published several Kd values based on measured Al concentration in groundwater and sediment and suggested Al Kd values for soil, grout, gravel, clay to be 3700 mL/g and 5000 mL/g for concrete, respectively.
Reference
Kaplan D.I. (2005) Recommended Distribution Coefficients, Kd Values, for Special Analysis Risk Calculations Related to Waste Disposal and Tank Closure on the Savannah River Site (U), Westinghouse Savannah River Company Savannah River Site,
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.
