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THE MEASUREMENT AND MECHANISM OF ION DIFFUSION IN SOILS. IX. CHANGES IN SOIL ACIDITY NEAR A SOURCE OF BICARBONATE IONS
Author(s) -
RAMZAN M.,
NYE P. H.
Publication year - 1978
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.1365-2389.1978.tb02049.x
Subject(s) - chemistry , bicarbonate , soil water , chloride , diffusion , calcareous , ion exchange , soil ph , cation exchange capacity , ion , inorganic chemistry , environmental chemistry , soil science , geology , paleontology , physics , organic chemistry , thermodynamics
Summary To simulate processes tending to raise the pH of soil near a plant root, a stack of moist HCO ‐ 3 saturated ion exchange resin papers was placed in contact with non‐calcareous soil of varying pH, containing HC1 + CaCl 2 in the soil solution. Changes in the concentration profiles of Ca 2+ , Cl ‐ and H + in the soil were followed. HCO ‐ 3 released from the resin in exchange for soil Cl ‐ reacted with the soil and raised its pH. Increases of up to 1 unit were measured near the interface. The zone of pH increase extended into the soil much less than the zone of chloride depletion. It was shown that Ca 2+ could accumulate near the interface in the absence of mass flow in this experimental system.