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用锂离子选择电极和经典 Ag- Ag Cl电极测定了 2 98.15K下 L i Cl- Li2 B4 O7- H2 O体系中离子强度范围为 0 .0 1～ 2 .50 mol· kg-1,不同 Li2 B4 O7离子强度分数的 L i Cl的平均活度系数。由实验数据 ,用迭代法及多元线性回归法 ,求取了 L i2 B4 O7的化学计量离解平衡常数 Km,热力学离解平衡常数 K及 Pitzer离子作用参数 ,并与实验值比较标准偏差为 0 .0 50 0。同时该实验结果在 0 .0 1- 0 .50 mol·kg-1离子强度范围内与 2 98.15K下 L i Cl- L i2 SO4 - H2 O体系 L i Cl平均活度系数的变化趋势进行了比较 ,得到 L i Cl在 Li2 B4 O7介质中平均活度系数随 Yb的增大而增大 ,而在 L i2 SO4 介质中则减小
The ionic strength of L i Cl- Li2 B4 O7-H 2 O system at 2 98.15 K was determined from 0.1 to 2.50 mol · kg-1 with Li-ion selective electrode and classical Ag- Average activity coefficient of L i Cl for B4 O7 ionic strength fraction. From the experimental data, the stoichiometric dissociation equilibrium constant Km, the thermodynamic dissociation equilibrium constant K and the Pitzer ion action parameter of L i2 B4 O7 were calculated by iterative method and multivariate linear regression method. The standard deviation of comparison with experimental data was 0. 0 50 0. At the same time, the experimental results showed that the average activity coefficient of L i Cl in L i Cl-L i2 SO 4 - H 2 O system at the ionic strength range of 0.0-10.0 mol · kg -1 was in agreement with that of L i Cl- In comparison, the average activity coefficient of LiCl in Li2B4O7 medium increases with the increase of Yb, but decreases in Li2SO4 medium