\( {\text{NO}}_{3}^{ - } \) and \( {\text{C}}_{2} {\text{O}}_{4}^{2 - } \)–OH?/sup> θ parameters were found to be 0.02369 and ?.005304, respectively. The Na-span class="InlineEquation" id="IEq5">\( {\text{C}}_{2} {\text{O}}_{4}^{2 - } \)-span class="InlineEquation" id="IEq6">\( {\text{NO}}_{3}^{ - } \) and Na-span class="InlineEquation" id="IEq7">\( {\text{C}}_{2} {\text{O}}_{4}^{2 - } \)–OH?/sup> ψ parameters were found to be 0.04069 and 0.017044, respectively. The solubility data could be modeled with temperature independent θ and ψ values over the experimental range investigated, which was 20-5?°C for the Na2C2O4–NaNO3–H2O system and 0-0?°C for the Na2C2O4–NaOH–H2O system." />
Pitzer Model Anion–Anion and Ternary Interaction Parameters for the Na2C2O4–NaOH–H2O and Na2C2O4–NaNO3–H2O Systems
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  • 作者：Jacob G. Reynolds ; Robert Carter
  • 关键词：Pitzer model ; Oxalate ; Na2C2O4 ; Hanford ; Radioactive waste ; High ; level waste
  • 刊名：Journal of Solution Chemistry
  • 出版年：2015
  • 出版时间：July 2015
  • 年：2015
  • 卷：44
  • 期：7
  • 页码：1358-1366
  • 全文大小：458 KB
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  • 作者单位：Jacob G. Reynolds (1)
    Robert Carter (2)

    1. Washington River Protection Solutions, LLC, P.O. Box 850, MSIN H6-04, Richland, WA, 99352, USA
    2. Energy Solutions, 2345 Stevens Dr. #240, Richland, WA, 99354, USA
  • 刊物类别：Chemistry and Materials Science
  • 刊物主题：Chemistry
    Physical Chemistry
    Industrial Chemistry and Chemical Engineering
    Geochemistry
    Oceanography
    Inorganic Chemistry
    Condensed Matter
  • 出版者：Springer Netherlands
  • ISSN：1572-8927
文摘
Alkaline high-level nuclear wastes in the United States contain large inventories of sodium oxalate (Na2C2O4) immersed in Na+-, \( {\text{NO}}_{3}^{ - } \)- and OH?/sup>-bearing electrolyte solutions. Dissolution and precipitation of Na2C2O4 will likely influence the treatment of this waste. The Pitzer model has been widely used to model electrolyte solubility during high-level nuclear waste processing. The present study determines the anion–anion (θ) and ternary cation–anion–anion (ψ) Pitzer interaction parameters for oxalate Na2C2O4–NaNO3–H2O and Na2C2O4–NaOH–H2O systems by fitting the Pitzer model with Na2C2O4 solubility data in aqueous NaNO3 and NaOH solutions. The \( {\text{C}}_{2} {\text{O}}_{4}^{2 - } \)-span class="InlineEquation" id="IEq3">\( {\text{NO}}_{3}^{ - } \) and \( {\text{C}}_{2} {\text{O}}_{4}^{2 - } \)–OH?/sup> θ parameters were found to be 0.02369 and ?.005304, respectively. The Na-span class="InlineEquation" id="IEq5">\( {\text{C}}_{2} {\text{O}}_{4}^{2 - } \)-span class="InlineEquation" id="IEq6">\( {\text{NO}}_{3}^{ - } \) and Na-span class="InlineEquation" id="IEq7">\( {\text{C}}_{2} {\text{O}}_{4}^{2 - } \)–OH?/sup> ψ parameters were found to be 0.04069 and 0.017044, respectively. The solubility data could be modeled with temperature independent θ and ψ values over the experimental range investigated, which was 20-5?°C for the Na2C2O4–NaNO3–H2O system and 0-0?°C for the Na2C2O4–NaOH–H2O system.

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