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Effects of Electrolyte Imbibition Upon Cation-Exchange Behavior of Soils¹

ABSTRACT

Ion-exchange chromatography was employed to study the effects of electrolyte imbibition by soils on their cation-exchange behavior. This was accomplished by study of the shape of effluent breakthrough curves from columns of Ca-saturated soils to which either Al⁺³ or K⁺ solutions were added. B-horizon samples of Cecil, Lloyd and Davidson, and the A_p horizon of a Yolo soil were employed in the study.

Comparison of experimental effluent curves with those predicted by the modified Walter equation showed a large discrepancy when anion interaction with soils was encountered. Anion distribution coefficients (Kd's) varied in the order Cl^- = NO₃^- < SO₄^-2 < H₂PO₄^- on a Ca-Lloyd soil. Only H₂PO₄^- had a Kd above zero on the Yolo soil. Column "symmetry values" for Ca⁺² K⁺ exchange were reduced as electrolyte imbibition by soils increased. Practical implications of these results are discussed.

¹ A contribution from the Agronomy Department, Virginia Polytechnic Institute, Blacksburg. Presented before Div. II, Soil Science Society of America at Cincinnati, Ohio. Nov. 18, 1959.

² Assistant Professor of Agronomy.

Received for publication January 8, 1960. Accepted for publication February 24, 1960.

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