SULFATE SORPTION BY ACID FOREST SOILS

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Abstract
The effects of organic matter and oxides of Al and Fe on sulfate adsorption by an iron podzol and a brown earth were studied by evaluating the differences in sulfate adsorption with and without these soil constituents. The removal of organic matter had little effect on sulfate adsorption but the removal of Al and Fe oxides had a marked reduction in sulfate adsorption capacity of the iron podzol. The reduction in sulfate adsorption by this soil, due to the removal of Al or Fe, was higher at low concentrations of sulfate in solution. The effect of Al and Fe removal on sulfate adsorption in the brown earth was relatively small and observed only at low concentrations of sulfate in solution.