Some of the factors affecting sulfate adsorption were studied using Cecil, White Store, and Nipe soils and H-Al-bentonite. The soils which contained a relatively large amount of 1:1 type clay minerals adsorbed more sulfate than the soils containing predominantly 2:1 type clay minerals. The amount of sulfate adsorbed decreased as the pH of the soil suspension increased from 4 to 6. The amount of sulfate adsorbed was found to be directly related to the concentration of sulfate in solution. For all of the soils studied, increasing the phosphate concentration in the solution reduced the amount of sulfate adsorbed by the soil. The data indicate that less sulfate ion is adsorbed by the clay particle in the presence of phosphate ion.

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