Abstract
A pH-measuring system was daveloped for the study of rock/hot water reaction. This system consists of a main reaction autoclave and a pH-measuring cell, and the main autoclave is connected with the pH measuring cell by three sampling pipes. The pH of reaction solution can be measured directly at the same temperature and pressure as the main autoclave. A platinum-hydrogen test electrode and a silver-silver chloride external pressure-balanced reference electrode were used in the pH-measuring cell. The pHmeasuring cell showed a Nernstian pH response in the all temperature and pressure ranges (100-250°C and 50-200kgf/cm2) studied here. The temperature dependence of pH for calcite-water system was determined under the saturated solubility condition in the temperature range of 100-250°C using the pH measuring system.
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