摘要
文章主要研究地下水在不同温度和CO2 分压条件下碳酸三种存在形式与 pH值的关系 ,以便更有效地对地下水水质资料进行可靠性检查。分析认为HCO-3 出现峰值的分界 pH0 值 ,纯水在CO2 分压 1～ 1 0 5Pa,温度 0～ 30℃时的变化范围为 7 92～ 8 6 0 ,碳酸盐岩地下水的变化范围为 8 2 8～ 8 5 7。pH0 值随温度的升高而降低。石灰岩和白云岩的 pH0 十分接近 。
The paper discusses the relationship between three forms of carbonate as H 2CO 3, HCO - 3 and CO 2- 3 and water pH value when the groundwater temperature and partial pressure of CO 2 vary so as to evaluate the reliability of water quality. It finds out that the demarcation point of pH that is called pH 0 when the quantity of HCO - 3 reaches maximum, is from 7 92 to 8 60 in water and from 8 28 to 8 57 in open groundwater system of carbonate rock when pressure of CO 2 in groundwater varies from 1 to 10 5 Pa and the groundwater temperature varies from 0 to 30℃. pH 0 will be lower and lower with groundwater temperature being higher and higher. The pH 0 in groundwatar of limestone is almost equal to that of dolomite limestone owing to the solubility of dolomite is very low to calcite. So features of carbonate equilibrium in carbonate rock depend on component of calcite. [
出处
《中国工程科学》
2003年第9期61-64,共4页
Strategic Study of CAE
关键词
碳酸盐岩
地下水
碳酸平衡
PH值
carbonate rock
groundwater
carbonate equilibrium
pH value
