Complexation of thorium with phosphate
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Christian Ekberg
Abstract
Using liquid–liquid extraction and the AKUFVE-technique developed by the Nuclear Chemistry Department at Chalmers University of Technology, Sweden, the complex formation equilibria of hydrogen phosphate (HPO42−) with thorium have been studied at different temperatures (15, 25 and 35 °C), varying pH (7, 8 and 8.7) and in 1 M (Na,H)ClO4. Evaluation of the acquired solvent extraction data indicated the formation of the ThHPO42+, Th(HPO4)2(aq) and Th(HPO4)32− complexes. For Th(HPO4)2(aq) and Th(HPO4)32−, the logarithm of the stability constants obtained at 25 °C were 17.0±3.5 and 23.7±0.2, respectively. Only an estimate of the stability of ThHPO42+ could be obtained. Enthalpies and entropies of the complex formation reactions have been determined: Th(HPO4)2(aq) (ΔH=698±27 kJ mol−1, ΔS=2669±91 J mol−1 K−1) and Th(HPO4)32− (ΔH=499±4 kJ mol−1, ΔS=2137±12 J mol−1 K−1).
© by Oldenbourg Wissenschaftsverlag, Göteborg, Germany
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