不同pH值水对碳酸盐侵蚀作用的研究

RESEARCH ON THE CARBONATE EROSION OF THE WATER WITH DIFFERENT pH VALUES

地下水的ｐＨ值可在３～１０的范围内变化，碳酸盐的溶解受地下水ｐＨ值的影响很大。本文从实验和理论上定量探讨了方解石、菱铁矿、菱镁矿、菱锌矿和重晶石在水中溶解度随ｐＨ的变化规律。笔者从溶度积常数出发，在考虑了金属离子和碳酸根的副反应及其活度系数的基础上，导出了一个计算溶解度的公式，给定不同ｐＨ值，就可用微机计算出该条件下的ｌｇＳ～ｐＨ的溶解度曲线。实验证明：计算与实测溶解度曲线形状相同。

Carbonate solubility is greatly influenced by the groundwater pH value because ground water pH valuechanges from 3 to 10. This paper discussed the law of solubility of calcite, siderite, magnesite, smithsoniteand basite in different pH value's water observationally and theoretically. The author, beginning with solubility product and considered side reaction coefficient and activity coefficient simultaneously, derived a formula for calculating solubility. If we give different pH values, a lgs Ph solubility curve at the present conditionsmay be achieved by the computer. It is proved by the test that the shape of the calculated curve is identical tothat of the observed curve.