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Effect of Anions in the System on the Amount of Cations Adsorbed by Soil Materials¹

ABSTRACT

Wells fine sandy loam and Utah bentonite (noncalcareous) were equilibrated in solutions of NaOH, NaCl, Na₂CO₃ and Na₂SO₄ to determine the effect of the different anions on the amount of cations retained by these materials.

Total exchangeable cations, exchangeable sodium and exchangeable calcium plus magnesium, as extracted by NH₄OAc method, were greatly affected by the anions in the systems.

Various possibilities for these results have been discussed. It was concluded that the adsorption capacity of the materials had not remained constant, but varied with the anion environment, and that this was the most important factor responsible for these results.

¹ Contribution from Department of Soils, North Dakota Agr. Exp. Sta., Fargo. Published with the approval of the Director as Journal Article No. 19. Presented before Div. II, Soil Science Society of America, Aug. 8, 1958, at Lafayette, Ind.

² Formerly Assistant Soil Scientist, now Assistant Agronomist, University of Idaho Branch Exp. Sta., Aberdeen, Idaho.

Received for publication June 6, 1960. Accepted for publication August 24, 1961.