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A Suggested Mechanism for Sulfate Adsorption by Soils^{1, 2,}

ABSTRACT

Equilibrium experiments with SO₄-Cl mixtures suggested that the quantity of anions held by a Cecil subsoil increases with time. Further experiments with K₂SO₄ confirmed the "time" effect on two Cecil subsoils and on Fe-treated Georgia kaolinite. On the basis of the time effect and other observations made on SO₄^2- adsorption a suggested mechanism is proposed. The mechanism envisions the replacement of OH^- ions by SO₄^2- and the hydrolysis of Al (in the presence of salt) to form H⁺ ions. Thus, the OH^- ions are neutralized by H⁺ ions and anion adsorption proceeds apace.

¹ A contribution from the Virginia Agr. Exp. Sta., Blacksburg. Presented before Div. II, Soil Science Society of America, St. Louis, Mo., Nov. 28, 1961.

² Supported in part by the National Science Foundation.

³ Graduate in part by the National Science Foundation.

Received for publication July 30, 1962. Accepted for publication October 23, 1962.