不同温度下氯化钙-葡萄糖-水体系的活度研究

Study of Activity Coefficients for CaCl_2-glucose System in Water at Different Temperature

用一个钙离子选择性电极（Ca-ISE）和一个氯离子选择性电极（Cl-ISE）作参比电极组成的电池测定308.15 K和318.15 K下水中Ca Cl2-葡萄糖体系的平均活度系数,糖的浓度从0.1-2.0 mol·kg-1,此法和用其他电动势法测得的结果一致性相当好。同时,结合参考文献的其他数据综合比较了不同温度下活度系数随浓度及温度的变化情况。结果表明,活度系数不但与浓度有关,而且也与温度有关。

Electrochemical cells with a calcium ion selective electrode （ Ca-ISE ） versus a chlorine ion selective electrode （ Cl-ISE） as a reference electrode were used to determine the activity coefficients for CaCl2-glucose system in water at 308. 15 K and 318. 15 K, the molality rage of glucose was from 0. 1 to 2. 0 mol · kg-1 . A comparison of the results thus obtained was made with those determined by another electromotive force （ emf） method. It was showed that agreement was excellent. At the same time, the activity coefficients for CaCl2 -glucose-water systems at these temperatures were compared with other reference data. The results suggested that the activity coefficients for CaCl2 in the systems not only related to molality but also to temperature.