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Molybdate Phase Equilibria in Soil¹

ABSTRACT

Solubility product relationships were investigated as a means of determining the possible solid phase forms of Mo which govern the concentration of Mo in the solution phase of soils. The Ksp value for ferrimolybdite was not available in the literature and was estimated to be approximately 10^-52.

The activities of Ca, Fe, Mo, and H in the liquid phase after 24 leachings and CaO treatments were used to determine possible solid phase forms in a Maumee sandy loam soil. Calcium molybdate and ferrous molybdate were too soluble for their solid phases to exist in this soil.

¹ Journal Paper no. 2822, Purdue University, Agr. Exp. Sta., Lafayette, Indiana. Presented before Div. S-2, Soil Science Society of America, Nov. 2, 1965 at Columbus, Ohio. Financial support of this research by the Climax Molybdenum Company of Michigan is greatfully acknowledged.

² Research Assistant and Professor of Agronomy, Purdue University, respectively.

Received for publication June 7, 1966. Accepted for publication November 3, 1966.