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Diffusion of Sorbed Solutes in Gas and Liquid Phases of Low‐Moisture Soils
Author(s) -
Ryan Patrick A.,
Cohen Yoram
Publication year - 1990
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/sssaj1990.03615995005400020007x
Subject(s) - tortuosity , water content , diffusion , moisture , effective diffusion coefficient , soil water , thermodynamics , soil science , chemistry , adsorption , materials science , porosity , environmental science , geology , geotechnical engineering , organic chemistry , physics , medicine , radiology , magnetic resonance imaging
Organic solute diffusion through the soil matrix is strongly affected by the moisture content of the soil. The solute diffusion coefficient in the commonly used one‐dimensional diffusion model, in which local equilibrium is assumed, is modified to include a semiempirical model for solute adsorption. The proposed approach accounts for the experimentally observed rise in the solute diffusion coefficient with moisture content, at low moisture content levels, and the decrease in the diffusion coefficient with increasing moisture above a critical moisture level. Finally, three tortuosity models are explored to examine their influence on the solute diffusion‐coefficient model over the entire range of possible soil moisture levels.