Molybdate Phase Equilibria in Soil

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.