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Salt transport in soil profiles with application to irrigation return flow: the dissolution and transport of gypsum in soils

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dc.contributor.authorGlas, Tjaart Kornelis, author
dc.contributor.authorMcWhorter, David B., author
dc.contributor.authorEnvironmental Resources Center, Colorado State University, publisher
dc.date.accessioned2007-01-03T04:53:46Z
dc.date.available2007-01-03T04:53:46Z
dc.date.issued1976
dc.descriptionSubmitted to Office of Water Research and Technology.
dc.descriptionJanuary 1976.
dc.description.abstractExperimental information on the dissolution of gypsum and the subsequent transport of the dissolved species in a soil-water system was obtained by measuring the calcium concentration in the solution phase as a function of time at different positions in columns filled with a soil-gypsum mixture that were leached with distilled water. These gypsum leaching experiments were performed with two different soils for a range of flow rates of the solution phase, solution contents and particle sizes of the gypsum material. The measured concentration-time curves were compared with results from two models, the first based on equilibrium chemical principles and the mixing cell concept and a second based on the one-dimensional convection-dispersion equation combined with a first-order kinetic rate equation describing the gypsum dissolution process. The formulation of the rate equation was based on the hypothesis that the rate of dissolution was proportional to the product of the saturation deficit and a function of the mass of gypsum present in the system. The equations in the kinetic model were solved numerically and a graphical and an optimization procedure were used to determine those values of the kinetic parameters for which the best possible agreement was obtained between the measured concentration-time curves and curves calculated from the kinetic model. It was concluded from the comparison between the experimental data, the mixing cell model and the kinetic model that the dissolution reaction of the gypsum was time dependent and was not controlled by the solubility product relationship, as assumed in the mixing cell model. The qualitative agreement between the kinetic model and the experimental results seems to support the hypothesis used in the formulation of the rate equation.
dc.description.sponsorshipOWRT Project no. A-017-COLO; supported (in part) by funds provided by the U. S. Department of the Interior, Office of Water Research and Technology, as authorized by the Water Resources Research Act of 1964 and pursuant to Grant Agreement Nos. 14-31-0001-3806, 14-31-0001-4006, and 14-31-0001-5006.
dc.format.mediumreports
dc.identifierCR_71.pdf
dc.identifierCCRICWRI100089CRPT
dc.identifier.urihttp://hdl.handle.net/10217/2620
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationwwdl
dc.relation.ispartofCompletion Reports
dc.relation.ispartofCompletion report series (Colorado State University. Environmental Resources Center), no. 71
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subject.lcshSoils -- Leaching -- Mathematical models
dc.subject.lcshGypsum
dc.titleSalt transport in soil profiles with application to irrigation return flow: the dissolution and transport of gypsum in soils
dc.typeText
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