Sulfate Reduction and Calcium Carbonate Equilibria in a Central California Histosol1
- S. J. Deverel,
- L. D. Whittig and
- K. K. Tanji2
Sulfate (SO2-4) reduction and bicarbonate (HCO-3) production were studied in three organic soil profiles removed intact from the California Delta area. The water table was maintained at approximately 0.75 m from the soil surface in columns 1.22 m in height. The partial pressure of carbon dioxide (PCO2) was monitored throughout the experiment. Extracted soil solutions were evaluated with respect to calcite solubility. Sulfate reduction was found to follow first-order kinetics for three different initial SO2-4 concentrations. Bicarbonate production followed approximately the stoichiometry of the organic matter oxidation-SO2-4 reduction reaction. Soil solutions extracted below the water table were found to be saturated with respect to calcite depending on the PCO2 and the initial SO2-4 concentration.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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