Aluminum(III) speciation with acetate and oxalate. A potentiometric and sup 27 Al NMR study
- Univ. Nancy, Vandoeuvre (France)
- Centre de Recherches sur la Valorisation des Minerais, Vandoeuvre (France)
Aluminum (III) hydrolysis and precipitation in the presence of acetic acid and oxalic acid have been studied by combining potentiometric titration and liquid-state {sup 27}Al NMR. The main aluminum species have thus been identified and quantified: unreacted hydrolyzed, complexed monomers, and the Al{sub 13} tridecamer. A solid species appeared when precipitation occurred and was quantified by difference with the other species. The quantitative evolution of these species was followed for pH values up to 5. Acetate forms weak complexes with aluminum. The precipitated phase was hypothesized to be aggregated Al{sub 13}. Oxalate forms strong multiligand complexes to form Al{sub 13} requires higher hydroxyl content. High oxalate contents (L/M > 1) inhibit tridecamer formation and precipitation occurs only at high pH values. With oxalate the precipitated phase seems to be devoid of Al{sub 13} and of a more condensed nature than it is with acetate.
- OSTI ID:
- 5316369
- Journal Information:
- Environmental Science and Technology; (United States), Vol. 25:9; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Pilot-Scale Testing of an Integrated Circuit for the Extraction of Rare Earth Minerals and Elements from Coal and Coal Byproducts Using Advanced Separation Technologies
Aluminum speciation and equilibria in aqueous solution: V. Gibbsite solubility at 50[degrees]C and pH 3-9 in 0. 1 molal NaCl solutions (a general model for aluminum speciation; analytical methods)
Related Subjects
ACETIC ACID
CHEMICAL REACTIONS
ALUMINIUM COMPOUNDS
ENVIRONMENTAL TRANSPORT
OXALIC ACID
ALUMINIUM 27
ALUMINIUM COMPLEXES
AQUATIC ECOSYSTEMS
EXPERIMENTAL DATA
HYDROLYSIS
NUCLEAR MAGNETIC RESONANCE
POTENTIOMETRY
PRECIPITATION
SOILS
TITRATION
VALENCE
ALUMINIUM ISOTOPES
CARBOXYLIC ACIDS
COMPLEXES
DATA
DECOMPOSITION
DICARBOXYLIC ACIDS
ECOSYSTEMS
INFORMATION
ISOTOPES
LIGHT NUCLEI
LYSIS
MAGNETIC RESONANCE
MASS TRANSFER
MONOCARBOXYLIC ACIDS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
RESONANCE
SEPARATION PROCESSES
SOLVOLYSIS
STABLE ISOTOPES
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)