电动势法对LiCl-MgCl_2-H_2O体系热力学性质的研究  

THERMODYNAMIC PROPERTIES OF ELECTROLYTE SOLUTIONS:AN EMF STUDY OF SYSTEM LiCl-MgCl_2-H_2O

作　　者：王瑞陵[1] 姚燕[1] 吴国梁[1] 

机构地区：[1]中国科学院青海盐湖研究所,西宁810008

出　　处：《物理化学学报》1993年第3期357-365,共9页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：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 activity coefficients of aqueous LiCl in system LiCl-MgCl_2-H_2O were deter-mined at 25℃ in the total ionic strength range from 0.05 to 6.0mol·kg^(-1) by E.M.F.method using a lithium ion-selective electrode and Ag/AgCl electrode.The electrode pairs used in present work were prepared in our laboratory andperformance tests were carried out.linear near-Nernst response,good reproducibility,stability and selectivity were observed.The Harned coefficients,Pitzer ternary interaction parameters and Scatchard par-ameters were evaluated from present measurement by using multiple regression.Theosmotic coefficients and the activity coefficients of MgCl_2 were calculated at thewhole range of the ionic strengths studied.The experimental activity coefficients were compared with which calculated byPitzer equation with known parameters from experimental osmotic coefficients.

关 键 词：氯化锂 氯化镁 水 热力学性质 

分 类 号：O642.542[理学—物理化学]