Thermodynamics of neptunium(V) fluoride and sulfate at elevatedtemperatures

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Complexation of neptunium(V) with fluoride and sulfate at elevated temperatures was studied by microcalorimetry. Thermodynamic parameters, including the equilibrium constants and enthalpy of protonation of fluoride and sulfate, and the enthalpy of complexation between Np(V) and fluoride and sulfate at 25 - 70 C were determined. Results show that the complexation of Np(V) with fluoride and sulfate is endothermic and that the complexation is enhanced by the increase in temperature - a three-fold increase in the stability constants of NpO{sub 2}F(aq) and NpO{sub 2}SO{sub 4}{sup -} as the temperature is increased from 25 to 70 C.

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Rao, Linfeng; Tian, Guoxin; Xia, Yuanxian & Friese, Judah I. October 31, 2006.

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Complexation of neptunium(V) with fluoride and sulfate at elevated temperatures was studied by microcalorimetry. Thermodynamic parameters, including the equilibrium constants and enthalpy of protonation of fluoride and sulfate, and the enthalpy of complexation between Np(V) and fluoride and sulfate at 25 - 70 C were determined. Results show that the complexation of Np(V) with fluoride and sulfate is endothermic and that the complexation is enhanced by the increase in temperature - a three-fold increase in the stability constants of NpO{sub 2}F(aq) and NpO{sub 2}SO{sub 4}{sup -} as the temperature is increased from 25 to 70 C.

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  • 11th International High-Level Radioactive WasteManagement Conference (IHLRWM), Las Vegas, Nevada, April 30 - May 4,2006

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  • Report No.: LBNL--59805
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 919372
  • Archival Resource Key: ark:/67531/metadc878003

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  • October 31, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 30, 2016, 3:57 p.m.

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Rao, Linfeng; Tian, Guoxin; Xia, Yuanxian & Friese, Judah I. Thermodynamics of neptunium(V) fluoride and sulfate at elevatedtemperatures, article, October 31, 2006; (digital.library.unt.edu/ark:/67531/metadc878003/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.