Actinide solubility and spectroscopic speciation in alkaline Hanford waste solutions
Conference
·
OSTI ID:370571
- Pacific Northwest Lab., NM (United States)
Information on the solubility and the speciation of actinide elements, especially plutonium and neptunium, in alkaline solutions is of importance in the development of separation techniques for the Hanford tank HLW supernatant. In the present study, experimental data on the solubilities of plutonium in simulated Hanford tank solutions were analyzed with Pitzer`s specific ion-interaction approach, which is applicable in dilute to highly concentrated electrolyte solutions. In order to investigate the formation of actinide species in alkaline solutions with ligands (e.g., hydroxide, aluminate and carbonate), spectroscopic measurements of neptunium (V), as a chemical analog of plutonium (V), were conducted. Based on the solubility data and available information on both solid and aqueous species, a thermodynamic model was proposed. The applicability and limitations of this model are discussed.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 370571
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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