摘要
用Ｎａ＋和Ｃｌ－离子选择性电极，测定了２５℃时ＮａＣｌ－Ｎａ２ＳＯ４－Ｈ２Ｏ三元体系中离子强度为０．４～４．５ｍｏｌ·ｋｇ－１时ＮａＣｌ的离子平均活度系数。用Ｐｉｔｉｅｒ方程、Ｋｕｍａｒ的混合规则及改进的平均球近似法对ＮａＣｌ－Ｎａ２ＳＯ４－Ｈ２Ｏ体系中ＮａＣｌ的离子平均活度系数进行了预测。预测值与实验值相比较表明，在离子强度较小时，三种模型的预测值与实验值均较为接近；离子强度较大时，改进的平均球近似法的预测值与实验值最接近。
The mean activity coefficients of NaCl in mixed electrolyte solution NaClNa2SO4-H2O with different concentrations (the total ionic strength up to 4. 5 mol/kg) weremeasured at 25t by use of ion selective electrodes (Na+ ISE and Cl- ISE). The meanactivity coefficients of NaCl for this system are predicted by Pitier equation (without mixingparameters), Kumar'S mixing rule and the mean spherical approximation (MSA) methodimproved by the authors 9 respectively. The results show that the accuracy obtaine'd from theimproved MSA method is the best.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1995年第3期5965-5965,共1页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金
关键词
活度系数
电解质溶液
氯化钠
测定
硫酸钠
水
activity coefficient
ionic selective electrode
mixed electrolyte solution
