四硼酸锂水溶液体系的热容及离子相互作用

采用Setaram BT 2.15微量热仪测定了Li_2B_4O_7-H2O体系(Li_2B_4O_7的浓度为0.00415~0.4208 mol/kg)在298.15,308.15和323.15 K下的热容,分别计算了不同温度和浓度下的表观摩尔热容,并获得了不同温度下表观摩尔热容与浓度的关系式.基于Li_2B_4O_7-H_2O体系的热容测定结果,应用Pitzer电解质溶液离子相互作用表观摩尔热容模型,拟合获得了四硼酸锂在不同温度下的Pitzer单盐参数.

Heat Capacities and Ion-interaction of Lithium Tetraborate Aqueous Solution System?

The heat capacities of aqueous solution systems( Li2 B4 O7-H2 O) with molality of Li2 B4 O7 of 0. 00415—0. 4208 mol/ kg at 298. 15, 308. 15 and 323. 15 K were determined experimentally using microcalo-rimeter. On the basis of experimental data, the apparent molar heat capacities at different concentrations and temperatures were calculated, and the relationship equations between apparent molar heat capacity and solu-tion concentration of lithium tetraborate at 298. 15, 308. 15 and 323. 15 K were obtained. The Pitzer single salt parameters of lithium tetraborate at different temperatures were fitted based on the Pitzer ion-interaction theory on the apparent molar heat capacity of electrolytes.