Component activities in the system thorium nitrate-nitric acid-water at 25/sup 0/C

Lemire, R J; Brown, C P

doi:10.1007/BF00667602

Title: Component activities in the system thorium nitrate-nitric acid-water at 25/sup 0/C

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Abstract

The equilibrium composition of the vapor above thorium nitrate-nitric acid-water mixtures has been studied as a function of the concentrations of thorium nitrate and nitric acid using a transpiration technique. At 25/sup 0/C, the thorium nitrate concentrations m/sub T/ ranged from 0.1 to 2.5 molal and the nitric acid concentrations m/sub N/ from 0.3 to 25 molal. The vapor pressure of the nitric acid was found to increase with increasing thorium nitrate concentration for a constant molatlity of nitric acid in aqueous solution. At constant m/sub T/, the nitric acid vapor pressure was particularly enhanced at low nitric acid concentrations. The water vapor pressures decreased regularly with increasing concentrations of both nitric acid and thorium nitrate. The experimental data were fitted to Scatchard's ion-component model, and to empirical multiparameter functions. From the fitting parameters, and available literature data for the nitric acid-water and thorium nitrate-water systems at 25/sup 0/C, expressions were calculated for the variation of water and thorium nitrate activities, as functions of the nitric acid and thorium nitrate concentrations, using the Gibbs-Duhem equation. Calculated values for the thorium nitrate activities were strongly dependent on the form of the function originally used to fit the vapor pressure data. 31more » references, 6 figures, 4 tables.« less

Authors:: Lemire, R J; Brown, C P

Publication Date:: Fri Jan 01 00:00:00 EST 1982

Research Org.:: Whiteshell Nuclear Research Establishment, Pinawa, Manitoba

OSTI Identifier:: 5558108

Resource Type:: Journal Article

Journal Name:: J. Solution Chem.; (United States)

Additional Journal Information:: Journal Volume: 11:3

Country of Publication:: United States

Language:: English

Subject:: 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; NITRIC ACID; VAPOR PRESSURE; THORIUM NITRATES; REACTION KINETICS; THERMODYNAMIC ACTIVITY; AQUEOUS SOLUTIONS; EQUILIBRIUM; EXPERIMENTAL DATA; MEDIUM TEMPERATURE; MIXTURES; QUANTITY RATIO; WATER; ACTINIDE COMPOUNDS; DATA; DISPERSIONS; HYDROGEN COMPOUNDS; INFORMATION; INORGANIC ACIDS; KINETICS; NITRATES; NITROGEN COMPOUNDS; NUMERICAL DATA; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SOLUTIONS; THERMODYNAMIC PROPERTIES; THORIUM COMPOUNDS; 400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials

Citation Formats


                    Lemire, R J, and Brown, C P. Component activities in the system thorium nitrate-nitric acid-water at 25/sup 0/C.  United States: N. p., 1982. 
        Web.  doi:10.1007/BF00667602.

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                    Lemire, R J, & Brown, C P. Component activities in the system thorium nitrate-nitric acid-water at 25/sup 0/C.  United States.  https://doi.org/10.1007/BF00667602

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                    Lemire, R J, and Brown, C P. 1982.  
        "Component activities in the system thorium nitrate-nitric acid-water at 25/sup 0/C".  United States.  https://doi.org/10.1007/BF00667602.

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@article{osti_5558108,

  title        = {Component activities in the system thorium nitrate-nitric acid-water at 25/sup 0/C},

  author       = {Lemire, R J and Brown, C P},

  abstractNote = {The equilibrium composition of the vapor above thorium nitrate-nitric acid-water mixtures has been studied as a function of the concentrations of thorium nitrate and nitric acid using a transpiration technique. At 25/sup 0/C, the thorium nitrate concentrations m/sub T/ ranged from 0.1 to 2.5 molal and the nitric acid concentrations m/sub N/ from 0.3 to 25 molal. The vapor pressure of the nitric acid was found to increase with increasing thorium nitrate concentration for a constant molatlity of nitric acid in aqueous solution. At constant m/sub T/, the nitric acid vapor pressure was particularly enhanced at low nitric acid concentrations. The water vapor pressures decreased regularly with increasing concentrations of both nitric acid and thorium nitrate. The experimental data were fitted to Scatchard's ion-component model, and to empirical multiparameter functions. From the fitting parameters, and available literature data for the nitric acid-water and thorium nitrate-water systems at 25/sup 0/C, expressions were calculated for the variation of water and thorium nitrate activities, as functions of the nitric acid and thorium nitrate concentrations, using the Gibbs-Duhem equation. Calculated values for the thorium nitrate activities were strongly dependent on the form of the function originally used to fit the vapor pressure data. 31 references, 6 figures, 4 tables.},

  doi          = {10.1007/BF00667602},

  url          = {https://www.osti.gov/biblio/5558108},
  journal      = {J. Solution Chem.; (United States)},
number       = ,

  volume       = 11:3,

  place        = {United States},

  year         = {Fri Jan 01 00:00:00 EST 1982},

  month        = {Fri Jan 01 00:00:00 EST 1982}

}

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