Calcium carbonate equilibria in solutions open to the air. II. Enhanced solubility of CaCO 3 in the presence of Mg 2+ and SO 4 2-

Details Calcium carbonate equilibria in solutions open to the air. II. Enhanced solubility of CaCO 3 in the presence of Mg 2+ and SO 4 2- Calcium carbonate equilibria in solutions open to the air. II. Enhanced solubility of CaCO 3 in the presence of Mg 2+ and SO 4 2-

Apr 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29..353a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 29, Issue 4, pp.353-360

Computer Science

5

Scientific paper

The solubility of CaCO 3 was determined in natural waters and in synthetic solutions containing Mg 2+ or SO 4 2- near 25° and at partial pressures of CO 2 in the range normal for the atmosphere. Solubility enhancement relative to the theoretical solubility of calcite was encountered in all the waters and solutions studied. A theory was developed on the basis of Langmuir adsorption of Mg 2+ , SO 4 2- , and the ions of CaCO 3 on a crystal surface consisting of calcite and of CaCO 3 having a modified calcite lattice. Both types of surface are in intimate contact through surface flow of adsorbed ions. From the theory an equation was derived relating the activity product (Ca 2+ )(CO 3 22- ) to the concentration ratios[ Mg 2+ ]/[ Ca 2+ ] and [ SO 4 2- ]/[ CO 3 2- ] at equilibrium. The equation was fitted to solubility data on the synthetic solutions. Parameters thus evaluated separately for the effect of Mg 2+ and of SO 4 2- were used together in the equation to calculate solubilities in six natural waters of widely different compositions. Good agreement was obtained with measured solubilities.

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