基于活度计算的碳酸平衡研究

研究考虑活度情况下地下水开放系统在不同温度和CO₂分压下碳酸的3种存在形式与pH值之间的关系.分析地下水中CO₂分压为10～105Pa,温度为0～30℃变化时pH₀的变化情况,发现在一定CO₂分压下,pH₀值随温度的升高而降低并趋于一个稳定的值.在一定温度下,pH₀值随CO₂分压的升高而降低.但不论地下水的温度和CO₂分压如何变化,pH₀=7.92～8.60.这些结论更符合地下水实际情况,更有利于对水分析资料的审查.

Study of carbonate equilibrium based on activity

In this article,the relationship between the three existing forms of carbonate and pH value is studied at different temperatures and CO₂ pressures in an open underground water system while activity is taken into consideration.We find that the value of pH₀ decreases with the increase of temperature and tends to a stable value at a given CO₂ pressure and the value of pH₀ decreases with the increase of the CO₂ pressure at a given temperature when CO₂ pressure changes in the range of 10～10⁵Pa and the temperature changes in the range of 0～30℃.However,no matter how the temperature and CO₂ pressure of the underground water change,pH₀=7.92～8.60.These conclusions reflects the actual conditions of the underground water and can be better used for the review of water analysis data.