Thesis
Studies of the thermodynamics of DTPA complexation of the rare Earth elements at high ionic strength, applications to the TALSPEAK process
Washington State University
Master of Science (MS), Washington State University
2012
Handle:
https://hdl.handle.net/2376/104448
Abstract
The heats of formation for the rare earth complexes of diethylenetriamine-N,N,N’,N”,N”- pentaacetic acid (DTPA) have been determined by isothermal titration calorimetry. Heats of protonation for DTPA have also been measured. Enthalpy data were compared to compiled literature values obtained at lower ionic strength to assess the impact of electrolyte concentrations on the thermodynamics of the complexation reaction. It was found that increasing ionic strength beyond I = 0.5M has no appreciable impact on lanthanide-DTPA complexation thermodynamics. As the complexation of the lanthanides by DTPA is an integral component of the TALSPEAK process for separating the lanthanides from the minor actinides during nuclear fuel reprocessing, the new thermodynamic data were applied to analysis of the system. A large exothermic discrepancy was discovered between the experimentally determined enthalpy of the extraction process and the sum of its components, perhaps indicating contributions from unaccounted interactions.
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Details
- Title
- Studies of the thermodynamics of DTPA complexation of the rare Earth elements at high ionic strength, applications to the TALSPEAK process
- Creators
- Gabriel Eugene Johnson
- Contributors
- Kenneth L. Nash (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Chemistry, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525005401842
- Language
- English
- Resource Type
- Thesis