2003, Volume 5, Issue 9
Strategic Study of CAE >> 2003, Volume 5, Issue 9
Inspection System of Carbonate Equilibrium for Groundwater
1. Civil Engineering College of Hohai University, Nanjing 210098, China
2. Nanjing University of Technology, Nanjing 210009, China
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Abstract
The paper discusses the relationship between three forms of carbonate as H2C03, HC03- and CC32- and water pH value when the groundwater temperature and partial pressure of C02 vary so as to evaluate the reliability of water quality. It finds out that the demarcation point of pH that is called pHO when the quantity of HCO3- 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 CO2 in groundwater varies from 1 to 105 Pa and the groundwater temperature varies from 0 to 30℃ . pHO will be lower and lower with groundwater temperature being higher and higher. The pHO 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.
Keywords
carbonate rock ; groundwater ; carbonate equilibrium ; pH value
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