Thermodynamics of neptunium(V) complexes with phosphate at elevated temperatures |
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Authors: | Yuanxian Xia J I Friese P P Bachelor D A Moore and Linfeng Rao |
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Institution: | (1) Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA;(2) Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA |
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Abstract: | The complexation of Np(V) with phosphate at elevated temperatures was studied by a synergistic extraction method. A mixed
buffer solution of TRIS and MES was used to maintain an appropriate pH value during the distribution experiments. The distribution
ratio of Np(V) between the organic and aqueous phases was found to decrease as the concentrations of phosphate were increased.
Stability constants of the 1:1 and 1:2 Np(V)-HPO4
2− complexes, dominant in the aqueous phase under the experimental conditions, were calculated from the effect of HPO4
2−] on the distribution ratio. The thermodynamic parameters including enthalpy and entropy of complexation between Np(V) and
HPO4
2− at 25 °C–55 °C were calculated by the temperature coefficient method. |
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Keywords: | |
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