Activity coefficients of CaCl(2) in (maltose plus water) and (lactose plus water) mixtures at 298.15 K

作者：Zhuo Kelei^*; Liu Hongxun; Zhang Honghao; Liu Yaohui; Wang Jianji

来源：Journal of Chemical Thermodynamics, 2008, 40(5): 889-896.

DOI：10.1016/j.jct.2007.12.008

• activity coefficient
• Gibbs free energy
• interaction parameter
• CaCl(2)
• maltose
• lactose

Activity coefficients of CaCl(2) in disaccharide {(maltose, lactose) + water} mixtures at 298.15 K were determined by cell potentials. The molalities of CaCl(2) ranged from about 0.01 mol . kg(-1) to 0.20 mol . kg(-1), the mass fractions of maltose from 0.05 to 0.25, and those of lactose from 0.025 to 0.125. The cell potentials were analyzed by using the Debye-Huckel extended equation and the Pitzer equation. The activity coefficients obtained from the two theoretical models are in good agreement with each other. Gibbs free energy interaction parameters (g(ES)) and salting constants (k(S)) were also obtained. These were discussed in terms of the stereo-chemistry of saccharide molecules and the structural interaction model.

• 出版日期2008-5
• 单位河南师范大学