Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
The reaction path in the open system calcite-CO2-H2O
Abstract
26.6 g of caJcite (grains of J to 1.26 mm in diameter) were dissolved in a stirred batch reactor and opened to ambient atmosphere (1 = 20.9 + 0.4 °C). During the experiment, pH and Ca-concentrations were monitored in solution. The data were discussed in terms of an equilibrium model. At the early stages of the experiment (tens of minutes), the data sequence (reaction path) led to the Jine representing equilibrium in a closed system. As soon as the slow process H2C03* = H20 + CO, had begun influencing the experimental system, the reaction path was gradually returning to the equilibrium in an open system. The total equilibrium was substantially approached at 55 hours.
