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Published in Soil Sci Soc Am J 43:268-273 (1979)
© 1979 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Dissolution and Transport of Gypsum in Soils: II. Experimental1

T. K. Glas, A. Klute and D. B. McWhorter2

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.

NOTES

1 Contribution from the USDA-SEA, Agricultural Research, and the Department of Agronomy, Colorado State Univ., Fort Collins, CO 80521. CSU Journal Series No. 2300. Research supported in part by OWRT Project A-017-COLO.

2 Physiologist, Int. Potato Center, Lima, Peru; Soil Scientist, USDA-SEA and Professor of Soils, Agronomy Department, Colorado State Univ.; and Associate Professor of Agricultural Engineering, Colorado State Univ., Fort Collins, respectively.

Received for publication April 10, 1978. Accepted for publication November 22, 1978.






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