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Effect of Mg²⁺ Ion on the Solubility of Solid Carbonates¹

ABSTRACT

The carbonate saturometer was used to determine the effect of Mg²⁺ ion on the solubility of four different calcareous materials. It was found that a high area calcite 13.5m²/g had a higher solubility than a low area calcite .8m²/g and that the difference in surface areas of these calcites modified the effect of Mg²⁺ ion on their solubilities.

Data indicated that the mineralogy of the solid carbonates can modify the effect of Mg²⁺ ion on the solubility of the solid phase. Carbonates which contained appreciable Mg showed a decrease in solubility with increasing Mg²⁺ ion, whereas carbonates with low or no Mg showed an increase in solubility.

¹ Partial support of this project by FWPCA Project WP-01492-01 is gratefully acknowledged. Published with the approval of the Director, Utah Agr. Exp. Sta. as Journal paper 1032.

² Graduate Assistant and Professor, Department of Soils and Meteorology, Utah State Univ., Logan, Utah, 84321. The senior author's present address is: Assistant Professor of Soils, Department of Agronomy, Univ. of Illinois, Urbana, Ill. 61801.

Received for publication June 1, 1970. Accepted for publication January 5, 1971.