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Adsorption of Nitrate in Amorphous and Kaolinitic Hawaiian Soils¹

ABSTRACT

The adsorption of nitrate in an amorphous Akaka silty clay and kaolinitic Wahiawa silty clay increased consistently with increasing concentration and decreasing pH of the electrolyte solution. The magnitude of adsorption was higher in the Akaka than in the Wahiawa soil. The amount of adsorbed nitrate was notably more when SO₄³ rather than Cl was used as the replacing anion. It was deduced that while the concentration-dependent NO₃ adsorption is due to electrostatic and van der Waal forces, the pH-dependent adsorption is largely due to electrostatic forces. The adsorption of nitrate followed the Freundlich type of isotherm.

¹ Published with the approval of the Director of the Hawaii Agr. Exp. Station as Technical Paper no. 1079. This work was supported in part by the Western Regional Research Project no. W-85 and is a part of the senior author's Ph.D. dissertation, University of Hawaii.

² Assistant in Agronomy and Soil Science, and Associate Professor of Soil Science, respectively.

Received for publication March 12, 1969. Accepted for publication April 29, 1969.