288.15 K-323.15 K下氯化锂、硫酸锂溶液的密度及摩尔体积研究

Densities and Molar Volumes of Aqueous Solutions of LiCl and Li2SO4 at Temperatures from 288.15 to 323.15 K

中文关键词:  氯化锂  硫酸锂  密度  表观摩尔体积  Pitzer离子相互作用模型

英文关键词:LiCl, Li2SO4, Density, Apparent molar volume, Pitzer ion interaction model

中文摘要:

      用振荡管密度计测定了常压下，温度在288.15 K ? 323.15K范围内不同离子强度下LiCl和 Li2SO4溶液的密度并计算了不同温度下的表观摩尔体积，待测溶液的浓度范围分别为(0.1 ? 18.9) mol·kg?1及(0.03 ? 3.0) mol·kg?1。用Pitzer离子相互作用模型拟合了LiCl和Li2SO4不同温度下的的Pitzer单电解质体积参数，模型的计算值与实验值吻合良好。

英文摘要:

      Densities of aqueous solutions of LiCl and Li2SO4 at solute molalities ranging from (0.03 to 18.9 or 3.0) mol·kg?1, respectively, have been measured by using vibrating-tube densitometer over the temperature range 288.15 ≤ T/K ≤ 323.15 at 0.1MPa pressure. The apparent molar volume of LiCl (aq) and Li2SO4 (aq) derived from these data were fitted using ion interaction model. The volumetric ion interaction parameters of LiCl and Li2SO4 at different temperatures and their temperature dependences were determined.