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Solute activity coefficients in dilute aqueous electrolyte mixtures. III. The ternary system HClO4+UO2(ClO4)2+H2O at 25°C

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Abstract

Isopiestic vapor pressure comparison measurements were conducted with the three-component system HClO4+UO2(ClO4)2+H2O in the concentration range between I=0.05 and 1.9m. Analysis of the mixture composition and concentration dependence of the osmotic coefficients with the Scatchard neutral-electrolyte and ion-component methods and with the Pitzer ioncomponent methods gave equally satisfactory results. Prediction of the observed osmotic coefficients by two-component approximations was satisfactory, and the data agreed well with values estimated with a model based on the osmolal fraction. A fair concordance was also found between predicted solute activity coefficients from simple models and values derived from complete treatments which included interaction terms.

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Boyd, G.E. Solute activity coefficients in dilute aqueous electrolyte mixtures. III. The ternary system HClO4+UO2(ClO4)2+H2O at 25°C. J Solution Chem 6, 747–756 (1977). https://doi.org/10.1007/BF00650451

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Key words

  • Activity coefficients
  • aqueous solutions
  • mixed electrolyte solutions
  • osmotic coefficients
  • perchloric acid
  • uranyl perchlorate