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), Journal Name: Environmental Science and Technology; (United States) Vol. 25:9; ISSN ESTHA; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
540320 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ACETIC ACID
ALUMINIUM 27
ALUMINIUM COMPLEXES
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
AQUATIC ECOSYSTEMS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COMPLEXES
DATA
DECOMPOSITION
DICARBOXYLIC ACIDS
ECOSYSTEMS
ENVIRONMENTAL TRANSPORT
EXPERIMENTAL DATA
HYDROLYSIS
INFORMATION
ISOTOPES
LIGHT NUCLEI
LYSIS
MAGNETIC RESONANCE
MASS TRANSFER
MONOCARBOXYLIC ACIDS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXALIC ACID
POTENTIOMETRY
PRECIPITATION
RESONANCE
SEPARATION PROCESSES
SOILS
SOLVOLYSIS
STABLE ISOTOPES
TITRATION
VALENCE