Thermodynamics of neptunium(V) fluoride and sulfate at elevatedtemperatures
Conference
·
OSTI ID:919372
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.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE. Office of Civilian Radioactive Waste Management.Waste Management System
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 919372
- Report Number(s):
- LBNL-59805; R&D Project: 407001; BnR: DF0961000; TRN: US0806361
- Resource Relation:
- Conference: 11th International High-Level Radioactive WasteManagement Conference (IHLRWM), Las Vegas, Nevada, April 30 - May 4,2006
- Country of Publication:
- United States
- Language:
- English
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