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A Computer Technique for Prediction of CaCO₃ Precipitation in HCO₃^- Salt Solutions¹

ABSTRACT

Five salt solution systems containing HCO₃^- were concentrated by evaporation, in contact with laboratory atmosphere, to simulate 2-to 10-fold reduction in volume. The amounts of CaCO₃ precipitated, final pH, and final solute concentrations were comprehensively predicted from the initial solute concentrations, degree of concentration of initial solution volume, and final P_CO2. A flow diagram of the computational scheme is presented for IBM 7040 Data Processing System. The basic equilibrium relationships in the CaCO₃ and HCO₃^--CO₃^2- cycles are applicable to any aqueous systems which precipitate CaCO₃ due to changes in solute concentration, partial pressure of CO₂ or ambient temperature.

¹ Contribution from the Department of Water Science and Engineering, University of California, Davis. This work was supported by funds from the Water Resources Center of the University of California. Computer facilities were made available through National Institutes of Health Grant FR00009.

² Laboratory Technician IV and Professor of Water Science, respectively.

Received for publication June 28, 1965. Accepted for publication August 27, 1965.