ISSN:
1572-8927
Keywords:
Thorium (IV)
;
sulfate
;
bisulfate
;
ammonium ion
;
alkali metal ions
;
aqueous
;
thermodynamic
;
complexation
;
high ionic strength
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract An aqueous thermodynamic model that is valid from zero to high concentration is proposed for the Na+−K+−Li+−NH 4 + −Th4+−SO 4 2− −HSO 4 − −H2O system. The model is based on the aqueous ion-interaction model of Pitzer and coworkers. The thorium sulfate complex species Th(SO4)2(aq) and Th(SO4) 3 2− are also included in the model. The final thermodynamic model presented here accurately predicts all reliable thermodynamic data, including solvent extraction and solubility data, for the Na+−K+−Li+−NH 4 + −Th4+−SO 4 2− −HSO 4 − −H2O system to high concentration. The aqueous thermodynamics of high-valence (3:2, 4:2), electrolytes are complicated by very strong specific ion interactions or ion pairing in dilute solution and by an effective redissociation of aqueous complex species at high concentration. Methods of treating these complications, in terms of valid aqueous thermodynamic models, are discussed in detail for the high-valence Th4+−SO 4 2− −H2O system.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00649695
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