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Dissolution and Transport of Gypsum in Soils: II. Experimental
Author(s) -
Glas T. K.,
Klute A.,
McWhorter D. B.
Publication year - 1979
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1979.03615995004300020004x
Subject(s) - gypsum , dissolution , distilled water , solubility , soil water , dispersion (optics) , solubility equilibrium , mixing (physics) , chemistry , phase (matter) , mineralogy , thermodynamics , geology , soil science , materials science , chromatography , metallurgy , physics , organic chemistry , quantum mechanics , optics
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.