HNO3-UO2(NO3)2-H2O系统的活度系数的测定和计算

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。

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

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.