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Reaction of Copper Tetrammine With Bentonite Clay¹

ABSTRACT

Copper (II) tetrammine was accumulated by bentonite in amounts greatly exceeding its cation exchange capacity. Analyses of sorption isotherms disclosed that at least two distinct reactions were involved. The first was completed at low equilibrium concentration and appeared to be insensitive to temperature changes. The second was an endothermic process that simulated compound formation. Exchangeable Cu(NH₃)₄²⁺ on the clay was evaluated by isotopic dilution and its exchange reaction with calcium was investigated. It is doubtful that Cu(NH₃)₄²⁺ can be used directly to assess copper exchange capacity of clays.

¹ Contribution from the Department of Soils & Plant Nutrition, Univ. of California, Berkeley, Cal. 94720. Part of the Ph.D. Thesis submitted by the senior author. This work was supported in part by US Atomic Energy Commission under Contract AT(11-1)-34, Project 23.

² Assistant Research Chemist, Space Sciences Laboratory, Berkeley; Assistant Professor of Soil Chemistry, Davis; and Professor of Soil Chemistry, Berkeley, respectively. The senior author is now Assistant Professor in the Department of Soil Sciences, Cairo Univ., Egypt, UAR.

Received for publication August 3, 1970. Accepted for publication April 7, 1971.