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化学学报
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化学学报 ›› 1993, Vol. 51 ›› Issue (2): 131-137. 上一篇    下一篇

研究论文

HNO3-UO2(NO3)2-H2O系统的活度系数的测定和计算

申屠雁明;李以堂   

  1. 清华大学化学与化学工程系
  • 发布日期:1993-02-15

Determination and calculation of activity coefficients for HNO3-UO2(NO3)2-H2O system

SHEN TUYANMING;LI YITANG   

  • Published:1993-02-15

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用H^+和NO3^-离子选择电极组成的电池用电势法测定了HNO3-UO2(NO3)2-H2O系统在25°C时的HNO3的平均活度系数, 求得了同时含有^E0和 ^S0-I关系式的Pitzer方程中的两粒子和三粒子作用参数(^s0(0), ^s(1),Ψ)。用Pitzer方程计算了该系统中水的活度, 并用Pitzer方程、Mckay-Perring方法和Harned方程分别计算了系统中HNO3和UO2(NO3)2的平均活度系数。

关键词: 水, 三元体系, 硝酸, 离子选择电极, 硝酸盐, 氧化物, 铀化合物, 活度系数, 电解质溶液

The mean activity coefficients of HNO3 in mixed electrolyte solution HNO3-UO2(NO3)2-H2O with different concentrations (the total ionic strongth up to 6.14mol/kg)were measured at 25°C by use of ion selective electrodes(H^+ ISE and NO3^- ISE) the binary and ternary interaction parameters (^S0(0), ^S0(1),Ψ) in the pitzer formalism (includding ^E0 and the relation of ^s0-ionic strength) were evaluated. the activities of H2O in these systems are predicted by the Pitzer formalism. the mean activity coefficients of HNO3 and UO2(NO3) for these systems are calculated by the pitzer formalism , the McKay -perring method and the harned equation. respectively.

Key words: WATER, TERNARY SYSTEM, NITRIC ACID, ION SELECTIVE ELECTRODE, NITRATE, OXIDE, URANIUM COMPOUNDS, ACTIVITY COEFFICIENT, ELECTROLYTE SOLUTION

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