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This article in SSSAJ

  1. Vol. 32 No. 3, p. 350-354
    Received: Sept 13, 1967
    Accepted: Jan 10, 1968

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Cation-Exchange Equilibrium Constants of Aluminum-Saturated Montmorillonite and Vermiculite Clays1

  1. A. E. Foscolos2



Equilibrium constants of aluminum-saturated montmorillonite and vermiculite clay minerals were studied in chloride-salt solutions at concentrations similar to those occurring in soil. Studies were limited to cations occurring most abundantly in soil solutions, viz., H+, Na+, K+, Mg2+, and Ca2+. The order of relative replacing power in the lyotropic series was found to be: Colony Wyoming montmorillonite (90 meq/100g CEC) H < Na < Mg < Ca < K < Al; Otay California montmorillonite (125 meq/100g CEC) H < Na < Mg < Ca < Al < K; Jeffersite vermiculite (175 meq/100g CEC) Mg < Ca < H < Al < Na.

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