基于活度计算的碳酸平衡研究  

Study of carbonate equilibrium based on activity

作　　者：刘建刚[1] 吴顺华[1] 郑克勋[1] 

机构地区：[1]河海大学土木工程学院,江苏南京210098

出　　处：《水科学进展》2004年第5期640-642,共3页Advances in Water Science

摘　　要：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。In this article, the relationship between the three existing forms of carbonate and pH value is studied at different temperatures and CO_2 pressures in an open underground water system while activity is taken into consideration.We find that the value of pH_0 decreases with the increase of temperature and tends to a stable value at a given CO_2 pressure and the value of pH_0 decreases with the increase of the CO_2 pressure at a given temperature when CO_2 pressure changes in the range of 10～10~5Pa and the temperature changes in the range of 0～30℃. However, no matter how the temperature and CO_2 pressure of the underground water change, pH_0=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.

关 键 词：活度 碳酸平衡 开放系统 CO2分压 PH值 

分 类 号：O661.1[理学—分析化学] P641.12[理学—化学]