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Cobalt Reactions with Montmorillonite¹

ABSTRACT

Specific reactions between montmorillonite and Co in low concentrations were studied in the presence of excess CaCl₂. Two forms of bound Co were distinguished. One form, characterized as being slowly dissociable, appears to be bound in a monolayer by chemisorption and will exchange with Cu⁺⁺, Zn⁺⁺, or other Co⁺⁺ and to a lesser extent with ions of other transition metals but not with Ca⁺⁺, Mg⁺⁺, or NH₄⁺. A second form of Co did not dissociate and could not be extracted from the mineral with 2.5% acetic acid. This fraction, which was not characterized, is thought to either enter the crystal lattice or be occluded in the precipitation of another phase.

¹ Contributed from the U. S. Plant, Soil and Nutrition Laboratory, ARS, USDA, Ithaca, New York. Presented before Div. II, Soil Science Society of America, Nov. 19, 1959, at Cincinnati, Ohio.

² Soil Scientist.

Received for publication November 10, 1959. Accepted for publication December 15, 1959.