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Hydrodynamic Dispersion Involving Cationic Adsorption During Unsaturated, Transient Water Flow in Soil
Author(s) -
Laryea K. B.,
Elrick D. E.,
Robin M. J. L.
Publication year - 1982
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/sssaj1982.03615995004600040001x
Subject(s) - loam , dispersion (optics) , adsorption , chemistry , particle (ecology) , potassium , partition coefficient , soil water , soil science , mineralogy , analytical chemistry (journal) , chromatography , environmental science , geology , optics , physics , oceanography , organic chemistry
The analysis of hydrodynamic dispersion of solutes during one‐dimensional absorption (horizontal flow) of solution into soil columns is extended to solutes which interact with the soil particle surfaces. The exchange process involved is assumed to be instantaneous and is described by a nonlinear adsorption isotherm. The relevant equations are solved for the apparent longitudinal dispersion coefficient using a computer program written in system/360 CSMP. Experiments with a clay loam soil indicated that when a concentrated solution of potassium chloride (KCl) (1 N ) infiltrates into a Ca 2+ ‐saturated soil, the apparent longitudinal dispersion coefficient is effectively velocity independent. This calculated coefficient reflects the possible combined effects of an immobile water fraction and salt exclusion.