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Retention of Cu²⁺, Ca²⁺, Mg²⁺, and Mn²⁺ by Amorphous Alumina¹

ABSTRACT

The adsorption of Cu²⁺ at low pH on amorphous alumina gels was studied using electron spin resonance and specific ion electrode techniques. The results, when compared with the inability of alumina to retain Mn²⁺, Ca²⁺, and Mg²⁺, indicated that Cu²⁺ demonstrated a specific preference for alumina. Both Cu²⁺ and Mg²⁺ were found to coprecipitate readily with alumina; however, these ions opened the structure, increasing the noncrystallinity and adsorptive capacity of the alumina. The data indicated that the sites of adsorbed and coprecipitated Cu²⁺ in alumina were similar, suggesting that adsorption of metals capable of occupying octahedral sites in the structure involves the same mechanism as substitution of the metals into the structure during coprecipitation. In both cases, the Cu²⁺ ions appeared to be nonexchangeable and immobile as they entered structural positions.

¹ Contribution of the Dep. of Agronomy, Comell Univ., Ithaca, NY 14853. Received 24 March 1977. Approved 30 Sept. 1977. Agronomy Paper No. 1201.

² Assistant Professor of Soil Chemistry.