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This article in SSSAJ

  1. Vol. 30 No. 1, p. 53-56
    Received: June 28, 1965
    Accepted: Aug 27, 1965

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

  1. K. K. Tanji and
  2. L. D. Doneen2



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 PCO2. A flow diagram of the computational scheme is presented for IBM 7040 Data Processing System. The basic equilibrium relationships in the CaCO3 and HCO3--CO32- cycles are applicable to any aqueous systems which precipitate CaCO3 due to changes in solute concentration, partial pressure of CO2 or ambient temperature.

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