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Theoretical Consideration of the Calcium Sulfate-Bicarbonate-Carbonate Interrelation in Soil Solution¹

ABSTRACT

The probable distributions of the ion-pairs CaSO₄° and CaCO₃°, and complex CaHCO₃⁺ in solution are discussed thermodynamically and graphically in terms of SO₄^2-, CO₃^2-, HCO₃^-, and H⁺ activities. In alkali media where the CO₃^2- form predominates, the CaCO₃° species will dominate the CaSO₄° and CaHCO₃⁺ forms and is a significant part of the total calcium in solution.

¹ Contribution from the US Water Conservation Laboratory, Soil and Water Conservation Research Division, ARS, USDA, Phoenix, Ariz. 85040.

² Research Chemist.

Received for publication February 26, 1969. Accepted for publication May 6, 1969.