摘要
测定和计算水溶液中多组分电解质的活度系数是一项十分重要和相当复杂的工作。采用国产离子选择电极测得了ＮａＮＯ３－Ｃｕ（ＮＯ３）２－Ｈ２Ｏ体系中 ＮａＮＯ３和 Ｃｕ（ＮＯ３）２的平均离子活度系数。还用所测数据和部分文献数据对Ｆｒａｎｋ－Ｔｈｏｍｐｓｏｎ弥散晶格模型、Ｍｅｉｓｓｎｅｒ半经验模型和Ｐｉｔｚｅｒ方程进行了检验。结果表明．用离子选择电极测定某些离子活度系数的方法简便易行。３个模型的计算精度不同。带θ、参数的Ｐｉｔｚｅｒ方程精度最高。
It is very important and rather complicated to determine and calculate activity coefficients of electrolytes when there are more than one electrolyte in aqueous phase. The authors measured the activity coefficients of both NaNO3 and Cu(NO3)2 in mixed electrolyte solution (NaNO3-Cu(NO3)2 -H2O) respectively by using ionic selective electrodes made in China. It is shown that this method is simple, quick and convenient for measuring the ionic activity coefficients. The experimental results obtained together with some other experimental data from literature are correlated by the Frank-Thompson diffusion lattice theory, Meissner expression and Pitzer equation. The mean errors between the experimental and calculated mean ionic activity coefficient data from these three calculating methods are different and the highest accuracy can be obtained by using Pitier equation with θ and ψ.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1989年第6期22-32,共11页
Journal of Tsinghua University(Science and Technology)
