Influence of Sorbed Hydroxyl and Sulfate on Liming Efficiency, pH, and Conductivity1
- A. Mehlich2
Soils having different values of permanent charge (CECp), variable charge (CECv), and anion-exchange capacity (AEC) were treated with hydroxyl, sulfate and hydrogen saturated exchange resins. The AEC was then principally OH- or SO42- saturated while CECp was principally saturated with aluminohydronium and CECv with covalently bound H. To these systems were added increments of Ca(OH)2 and the release of SO42-, Ca2+ sorption efficiency, pH, and conductivity measured. Soils containing sorbed SO42- had lower Ca2+ sorption efficiency, higher lime requirements, lower pH's and higher specific conductivities than those containing sorbed OH-. These effects were the result of replacement of sorbed SO42- by OH- according to the reaction: Soil-SO4 + Ca(OH)2 → Soil-(OH)2 + CaSO4Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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