Journal article
Spectroscopic studies of the chemical speciation in concentrated alkaline aluminate solutions
Journal of the Chemical Society - Dalton Transactions, (18), pp.3007-3012
1998
Abstract
The 205Tl NMR and UV/VIS spectral changes associated with the hydrolysis of thallium(I) have been employed to investigate hydroxide-sensitive equilibria in highly concentrated alkaline aluminate solutions {0.1 M < [Al(III)]T < 2.6 M; 0.15 M < [NaOH]T < 4.0 M} in an ionic medium of 8 M Na(ClO4) at 25°C. Spectroscopic titrations were performed at [OH-]T/[Al(III)]T ratios of 6.08, 5.06, 4.59 and 4.33 and also at notionally constant [OH-]. The data obtained demonstrate conclusively that the hydroxide concentration at high [OH-]T and [Al(III)]T/[OH-]T ratios is significantly higher than if only the well established Al(OH)4-(aq) ion is present. In agreement with previous potentiometric results, the data are consistent with the formation of one or more oligomeric species of general formula Alq(OH)3q-rr+(aq) (with q = 4-7 and q + r = 1 or 2). Evidence is also presented for the formation of at least one Tl(I)-aluminate solution species. However, unequivocal interpretation of the data is difficult because of possible ion pairing, solvation and activity coefficient effects occurring in these extremely concentrated electrolyte solutions.
Details
- Title
- Spectroscopic studies of the chemical speciation in concentrated alkaline aluminate solutions
- Authors/Creators
- P. Sipos (Author/Creator)S.G. Capewell (Author/Creator)P.M. May (Author/Creator)G. Hefter (Author/Creator)G. Laurenczy (Author/Creator)F. Lukács (Author/Creator)R. Roulet (Author/Creator)
- Publication Details
- Journal of the Chemical Society - Dalton Transactions, (18), pp.3007-3012
- Publisher
- Royal Society of Chemistry
- Identifiers
- 991005542167307891
- Murdoch Affiliation
- School of Chemical and Mathematical Science
- Language
- English
- Resource Type
- Journal article
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