Activity coefficients of rubidium chloride and cesium chloride in methanol-water mixtures and a comparative study of Pitzer and Pitzer-Simonson-Clegg models (298.15 K)

作者：Cui Rui Fang; Hu Man Cheng^*; Jin Li Hua; Li Shu Ni; Jiang Yu Cheng; Xia Shu Ping

来源：Fluid Phase Equilibria, 2007, 251(2): 137-144.

DOI：10.1016/j.fluid.2006.11.016

• activity coefficient
• Pitzer model
• Pitzer-Simonson-Clegg model
• mixed solvents
• EMF measurement

Activity coefficients of rubidium chloride and cesium chloride in methanol-water mixed solvent systems were determined by electromotive force (EMF) measurements at 298.15 K, in the range 0-40% (wt.%) methanol. For our work, the cells: Rb-ISE vertical bar RbCl (m), methanol (Y), water (1 - Y)vertical bar Cl-ISE; Cs-ISE vertical bar CsCl (m), methanol (Y), water (1 - Y)vertical bar Cl-ISE were used to obtain the emf data. The rubidium and cesium ion-selective electrodes were prepared by ourselves, and they exhibited reasonably good Nernst response. Then the experimental data were calculated by both Pitzer and Pitzer-Simonson-Clegg models. We got the corresponding parameters of two models, the standard potentials and the activity coefficients of rubidium chloride and cesium chloride. Moreover, the standard Gibbs free energies of transference of RbCl or CsCl from water to methanol-water mixtures had been discussed as well. After the comparative study, it was found that the Pitzer-Simonson-Clegg model was superior in this work.

• 出版日期2007-2-15
• 单位陕西师范大学