应用323 K三元子体系的溶解度数据,采用多元线性回归方法拟合出该四元体系在323 K时的Pitzer方程的混合离子相互作用参数θ(Br-,SO24-),Ψ(Na+,Br-,SO24-),Ψ(K+,Br-,SO24-)(相关文献鲜有报道),在此基础上应用Pitzer方程对323 K四元体系Na+,K+∥Br-,SO24--H2O的溶解度数据进行理论计算,并用计算出的溶解度数据绘制出四元相图。计算结果表明,模拟计算值与实测值基本吻合,较好地验证了实验数据的准确性,同时也表明含有合理参数的Pitzer模型完全可以描述含Na+,K+∥Br-,SO24--H2O的体系。
Using the stable equilibrium solubilities data of the ternary systems at 323 K, the mixing ion-interaction parameters of Pitzer's equation θ(Br-,SO24-),Ψ(Na+,Br-,SO24-), and Ψ(K+,Br-,SO24-) were fitted by multiple linear regression method, which were rarely reported in the related literatures. The solubilities of phase equilibrium in the quaternary system Na+,K+∥Br-,SO4(2-)-H2O 323K were calculated by Pitzer's equation, and the phase diagram was plotted. The results show that the calculated values have a good agreement with the measured data, and it can demonstrate the accuracy of the measured data. It also shows that the reasonable parameters of Pitzer model can be used in aqueous salt system Na+,K+∥Br-,SO24--H2O.