Evaluation of excess volume in UO2(NO3)2 · 6H2O-HNO3-H2O ternary mixture |
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Authors: | Y J Shin H D Kim I S Kim H S Shin S G Ro |
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Institution: | (1) Korea Atomic Energy Research Institute, 150 Dukjin-dong, Yusong, 305-600 Taejôn, (Korea) |
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Abstract: | In order to obtain the exact information of atomic number density in UO2(NO3)2 · 6H2O–HNO3–H2O ternary mixture, the theoretical estimation of excess volume which is one of excess properties of non-ideal solution is discussed in this study. The calculation model based on the Stokes-Robinson application of the Brunauer-Emmett-Teller (BET) adsorption isotherm and activity equations of water nitric acid, and uranyl nitrate hexahydrate (UNH) which were used to calculate distribution coefficients in a solvent extraction system has one adjustable parameter and two BET constants. The BET constants have been determined by asymptotic method on the BET adsorption isotherm as a function of water activity in the ternary system. As results of the study, the observed volume of mixture agrees with the volume predicted by the simulation within a maximum relative deviation of 0.78% and the excess volume is also estimated as a function of total molality. |
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