K~+, Na~+//Cl~-,SO_4~(2-),NO_3~--H_2O体系热力学研究

通过引入表达离子缔合或离子间的短程静电作用项,提高了局部组成模型关联单一电解质水溶液体系热力学性质的精度,并通过建立新的计算多元混合体系作用参数的方法,将其推广应用到多离子电解质溶液体系。在此基础上,预测了Na+//Cl-,SO2-3,H2O、K+//Cl-,SO2-4,NO-4,NO-3,H2O、K+,Na+//Cl-,SO2-4,H2O、K+,Na+//Cl-,NO-3,H2O3,H2O、K+,Na+//SO2-4,NO-3,H2O5个四元体系及K+,Na+//Cl-,SO2-4,NO-五元体系的溶解度,模型参数均通过上述体系所包含的二元、三元体系的溶解度数据获得,计算结果满意。

Thermodynamic model of the system K~+, Na~+//Cl~-,SO_4~(2-),NO_3~--H_2O

With introducing a term to present ion association and developing a new method to calculate the energy parameters of multi component electrolyte solution, the electrolyte nonrandom two liquid model proposed by Chen C. C. was improved, and could be used for mixtures containing an indefinite number of ions of arbitrary charge. As a result, the solubilities were predicted for the system Na+//Cl-,SO2-4,NO-3,H2O?K+//Cl-,SO2-4,NO-3,H2O?K+,Na+//Cl-,SO2-4,H2O?K+,Na+//Cl-,NO-3,H2O?K+,Na+//SO2-4,NO-3,H2O?K+,Na+//Cl-,SO2-4,NO-3,H2O, all parameters were determined only from the liquid solid equilibrium data of the binary and ternary systems. The solubilities predicted agree with the data in literature very well.