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Soil Science Society of America Journal Abstract -

Experimental Validation of the Monophase Structure Model for Montmorillonite Solubility


This article in SSSAJ

  1. Vol. 52 No. 4, p. 1199-1201
    Received: Nov 19, 1987

    * Corresponding author(s):
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  1. J. A. Kittrick  and
  2. F. J. Peryea
  1. Dep. of Agronomy and Soils, Washington State Univ., Pullman, WA 99164
    Washington State Univ., Tree Fruit Res. Center, Wenatchee, WA 98801



Previously published solubility data for Belle Fourche montmorillonite were plotted on pH or pH-pK+ vs. pSi(OH)4 axes, in order to determine the proper model for representing smectite formulas in hydrolysis reactions. The resulting line slopes did not agree with predictions based upon a model where smectite and exchangeable ions are considered to be separate phases. A model where exchanger and exchangeable ions form a single macroscopic phase (monophase) generated a line slope that agreed with the data within experimental error. Agreement between the monophase model and the data suggests that the experimental requirements for phase meta-equilibrium and K saturation were sufficiently met to show that smectite solid solutions behave as thermodynamic phases over the time span of the experiments.

Scientific Paper no. 7911. College of Agriculture and Home Economics Research Center, Washington State Univ., Pullman, WA 99164.

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