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This article in SSSAJ

  1. Vol. 35 No. 4, p. 571-574
     
    Received: Aug 3, 1970
    Published: July, 1971


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doi:10.2136/sssaj1971.03615995003500040027x

Reaction of Copper Tetrammine With Bentonite Clay1

  1. M. H. El-Sayed,
  2. R. G. Burau and
  3. K. L. Babcock2

Abstract

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.

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