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THE MEASUREMENT AND MECHANISM OF ION DIFFUSION IN SOILS V. DIFFUSION OF HYDROGEN ION IN SOILS
Author(s) -
FARR E.,
VAIDYANATHAN L. V.,
NYE P. H.
Publication year - 1970
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1970.tb01147.x
Subject(s) - ion , chemistry , diffusion , soil water , analytical chemistry (journal) , flux (metallurgy) , sink (geography) , hydrogen ion , hydrogen , phase (matter) , inorganic chemistry , thermodynamics , chromatography , soil science , physics , cartography , organic chemistry , geography , environmental science
Summary The linear diffusion of H ion from a series of soil blocks, containing essentially H and Ca only as exchangeable cations, into a sink solution maintained at pH 5·2, has been studied. In three separate series of experiments, first the total concentration of diffusible H, then the amount of diffusible H in the pore solution, and finally the amount of exchangeable H associated with the solid phase have been successively varied. Account has also been taken of the variation in activity ratio: a H /√ a c a . The effect on the resulting flux and diffusion coefficients of the ion has been related to the H buffer power of the soil. The impedance factor of the ion through the liquid pathway is slightly lower than that for other cations determined in soil. The diffusive flux of H occurs through the liquid pathway, and the contribution of solid‐associated H is small, except possibly at low H ion solution concentrations.