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This article in SSSAJ

  1. Vol. 43 No. 2, p. 268-273
     
    Received: Apr 10, 1978
    Published: Mar, 1979


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doi:10.2136/sssaj1979.03615995004300020004x

Dissolution and Transport of Gypsum in Soils: II. Experimental1

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

Abstract

Abstract

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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