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Ion Diffusion: II. Comparison of Apparent Self and Counter Diffusion Coefficients
Author(s) -
Phillips R. E.,
Brown D. A.
Publication year - 1964
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/sssaj1964.03615995002800060024x
Subject(s) - loam , diffusion , kaolinite , montmorillonite , silt , chemistry , analytical chemistry (journal) , mineralogy , soil water , soil science , thermodynamics , chromatography , geology , organic chemistry , physics , paleontology
The experimental distributions of Rb 86 diffusing in soil materials are obtained using a quick‐freeze method. The calculation of apparent diffusion coefficients of Rb from data obtained from these distributions is presented for the following geometries: ( 1 ) self diffusion and ( 2 ) counter diffusion of Rb diffusing from soil media initially saturated with Rb into the same soil media initially saturated with H + . The distribution of Rb 86 counter diffusing from kaolinite clay, montmorillonite clay, Sharkey clay soil and Dundee silt loam soil pastes into H + saturated kaolinite, montmorillonite, Sharkey and Dundee pastes can be characterized using self diffusion theory. The order of magnitude of apparent self diffusion coefficients is larger than those for counter diffusion in each of the four soil materials. The order of magnitude of the rate of Rb diffusion in the four soil materials is as follows: kaolinite clay > Dundee silt loam soil > Sharkey clay > montmorillonite clay. The values of the diffusion coefficients range from 3.9 × 10 −7 cm. 2 sec. −1 to 24.3 × 10 −7 cm. 2 sec. −1 . Qualitative apparent counter diffusion coefficients of Rb diffusing from soil media initially saturated with Rb into strong acid exchange‐resin discs initially saturated with H + are also presented for qualitative comparison purposes.