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Reduced Sodium Exchange Capacity in Unsaturated Flow
Author(s) -
Mokady R. S.,
Bresler E.
Publication year - 1968
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/sssaj1968.03615995003200040015x
Subject(s) - diffusion , anisotropy , mixing (physics) , chemistry , saturation (graph theory) , molecular diffusion , flow (mathematics) , cation exchange capacity , ion exchange , dispersion (optics) , sodium , soil science , ion , mechanics , thermodynamics , soil water , geology , organic chemistry , optics , mathematics , physics , metric (unit) , operations management , combinatorics , quantum mechanics , economics
Abstract Flowing water with a reduced degree of saturation seems to reduce the apparent or effective cation‐exchange capacity. The experiment was performed by running water through a layered soil, thus obtaining unsaturated flow conditions. It is suggested that the flow direction induces anisotropy with respect to molecular diffusion. The hydrodynamic dispersion in the flow direction is almost unaffected. At the same time there must be some locations off the main water stream with which there is negligible mixing or molecular exchange by diffusion. One may associate to these isolated locations a prevailing direction normal to the mainstream. In this case, it can be said that the unsaturated flow induces anisotropy on ion transfer by mixing or molecular diffusion.