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The Effect of pH, Sulfate and Phosphate Concentrations on the Adsorption of Sulfate by Soils¹

ABSTRACT

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.

¹ Contribution from the Department of Agronomy, North Carolina Agr. Exp. Sta., Raleigh, North Carolina. Submitted with the approval of the Director as paper No. 673 of the Journal Series. Presented before Div. II, Soil Science Society of America, Davis, Calif. on August 18, 1955.

² Assistant Professor of Agronomy, North Carolina State College; formerly Professor of Agronomy, North Carolina State College, now Midwest Manager of the American Potash Institute, Inc.; and Professor of Agronomy, North Carolina State College, respectively.

Received for publication September 2, 1955.