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用自制的锂离子选择电极和经典的Ag-AgCl 电极,以电动势法测定了25℃时离子强度为0.05—6.0 mol·kg~(-1)范围的LiCl-MgCl_2-H_2O 三元体系中LiCl 的平均活度系数.由实验数据,求出了Pitzer 方程、Harned 方程和Scatchard 方程的参数和系数.用上述方程计算了LiCl 在该体系中的活度系数,并与实验值进行比较,标准偏差小于0.008.与等压法测定的渗透系数拟合的Pitzer 方程参数计算值比较在实验误差范围内.同时计算了MgCl_2在该体系中的平均活度系数和混合溶液的渗透系数.
The LiCl-MgCl 2 -H 2 O ternary system with the ionic strength of 0.05-6.0 mol · kg -1 at 25 ℃ was measured by the electromotive force method with a homemade Li-ion selective electrode and a classical Ag-AgCl electrode. Average activity coefficient.The parameters and coefficients of Pitzer equation, Harned equation and Scatchard equation were calculated from the experimental data.The activity coefficient of LiCl in the system was calculated by the above equation and compared with the experimental values, the standard deviation is less than 0.008 The Pitzer equation parameters fitted with the permeability coefficient determined by the isobaric method are within the experimental error range and the average activity coefficient of MgCl 2 in the system and the permeability coefficient of the mixed solution are calculated.