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Soil Science Society of America Journal Abstract -

Determination of the Apparent Dispersion Coefficient of Solutes in Unsaturated Soil1


This article in SSSAJ

  1. Vol. 42 No. 6, p. 874-877
    Received: Oct 13, 1977
    Accepted: July 19, 1978

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  1. R. F. Paetzold and
  2. H. D. Scott2



A method for determining the apparent dispersion coefficient of a solute in unsaturated soils at relatively low soil water flow rates is presented. Two soil cores with different initial water contents were joined and water allowed to flow between the soil cores for a specified time interval. The distribution of a radioactively tagged solute, initially present in one of the soil cores, was subsequently determined by freezing the cores in liquid air, sectioning the soil with a refrigerated microtome, and analyzing the soil sections for solute content using liquid scintillation techniques. Apparent dispersion coefficients could be determined either with or against the water flow. The solutes used in this study were tritiated water, chloride, and metribuzin (a herbicide).

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