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Comparisons of Measured and Theoretical Mn²⁺ Concentrations in Soil Suspensions¹

ABSTRACT

The Mn²⁺ concentrations in control and autoclaved suspensions of nine acid and alkaline soils in 0.01M CaCl₂ differed widely from the Mn²⁺ concentrations calculated from models which either require measurement of Eh or assume Eh to be fixed by another redox couple. An alternative model is proposed which expresses the equilibrium solubility of the manganese compounds in terms of pH — pMn. The values of pH — pMn measured in the suspensions of all the soils tested correspond to the solubility of MnO₂.

¹ Contribution of the Department of Agricultural Chemistry & Soils, University of Arizona, Tucson, 85721. Journal Paper no. 1521 of the Arizona Agr. Exp. Sta.

² Associate Professor.

Received for publication July 22, 1969. Accepted for publication December 2, 1969.