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采用改进的等压法研究了影响多元轻稀土硝酸盐水溶液体系等压平衡的因素,确定了在低水活度区以氯化钙水溶液、高水活度以氯化钠水溶液为等压平衡参考物;等压平衡实验时间按水溶液浓度由高到低的顺序依次从4d到7d不等;确定了硝酸镧、硝酸镨及硝酸钕水溶液的等当点。结果表明,在实验误差允许范围内,所考察的系统符合偏理想溶液模型。
The isobaric pressure was used to study the factors that affect the isobaric balance of the nitrous acid aqueous solution. The results showed that in the low water activity zone, the calcium chloride aqueous solution and the high water activity were equilibrated with sodium chloride aqueous solution The isobaric equilibrium time was varied from 4d to 7d according to the order of aqueous solution, and the equivalence points of lanthanum nitrate, praseodymium nitrate and neodymium nitrate aqueous solution were determined. The results show that the experimental system is in accordance with the ideal solution model.