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This article in SSSAJ

  1. Vol. 43 No. 2, p. 268-273
    Received: Apr 10, 1978
    Accepted: Nov 22, 1978

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Dissolution and Transport of Gypsum in Soils: II. Experimental1

  1. T. K. Glas,
  2. A. Klute and
  3. D. B. McWhorter2



Experimental information on the dissolution of gypsum and the subsequent transport of the dissolved species in a soil-water system was obtained by adding distilled water to the top of 30-cm long columns containing a soil-gypsum mixture and by measuring the calcium concentration in the solution phase as a function of time at different positions in the columns. The measured concentration-time curves are compared with results from two models — the first based on equilibrium chemical principles and the mixing-cell concept, and the second based on a combination of the one-dimensional convection-dispersion equation and a first-order kinetic expression describing the dissolution process. Under the specific experimental conditions studied, the dissolution process appeared to be kinetically controlled and could not be described by the solubility-product relationship.

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