Thesis
Sodium phosphate solubility in electrolyte solutions at elevated temperatures: impact on Hanford waste tank chemistry
Washington State University
Master of Science (MS), Washington State University
2013
Handle:
https://hdl.handle.net/2376/101084
Abstract
The solubility of sodium phosphate dodecahydrate has been determined from 40°C to 80°C in solutions of sodium salts containing nitrate, nitrite, hydroxide, chloride, fluoride, sulfate, carbonate, and oxalate. Thermodynamic parameters have been calculated using van't Hoff analyses and applied to determine solubility trends in solution conditions of changing cation, anion, concentration, and ionic strength. The dissolution of sodium phosphate is entropically driven. Solubility was found to be impacted by common ion effects, sodium and hydroxide concentrations, and double salt formation. Sodium phosphate samples that precipitated from sodium salt solutions cooled to room temperature from 40°C were examined by FTIR. Rapid precipitation trapped other salts in solution interstitially within the crystal lattice. As sodium phosphate solubility and precipitation is important during caustic leaching of phosphate from Hanford nuclear waste tanks, this data can be applied to the understanding of solution effects on sodium phosphate solubility during waste treatment operations.
Metrics
56 File views/ downloads
48 Record Views
Details
- Title
- Sodium phosphate solubility in electrolyte solutions at elevated temperatures
- Creators
- Jeffery Michael Johnston
- Contributors
- Kenneth 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
- 99900525184301842
- Language
- English
- Resource Type
- Thesis