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Nitrate Adsorption: II. In Competition with Chloride, Sulfate, and Phosphate¹

ABSTRACT

In anion-exchange equilibria studies on two Andepts and one Oxisol, Cl^- showed a slight preference over NO₃^-, and SO₄^2- and H₂PO₄^- were greatly preferred over NO₃^-. Negative adsorption of NO₃^- occurred when SO₄^2- or H₂PO₄^- exceeded certain concentrations. Under limited conditions, increases in Cl^-, SO₄^2-, or H₂PO₄^- adsorption caused proportional decreases in the amounts of NO₃^- adsorbed. On a mmole basis, the decreases in NO₃^- adsorption equaled the increase in adsorption of other anions, except in the case of H₂PO₄^-, where about 3 to 4 mmoles of H₂PO₄^- were adsorbed for a decrease in the adsorption of 1 mmole of NO₃^-, suggesting that H₂PO₄^- reacts with more sites of the same type and/or with types not available for NO₃^- adsorption.

¹ Contribution from the Dept. of Soil Science and Agr. Eng., Univ. of Calif., Riverside. Part of a dissertation submitted by the senior author in partial satisfaction of the requirements for a Ph.D. degree in Soil Science. Financial assistance of the National Science Foundation through Grant no. GB 11711 and U.S.A.I.D. Contract Ohio State University-Universidade de Sao Paulo are gratefully acknowledged.

² Former Graduate Student and Professor of Soil Science, respectively. The senior author is now a staff member of the Departamento de Solos, Universidade de Sao Paulo, Piracicaba, Sao Paulo, Brasil.

Received for publication January 20, 1971. Accepted for publication June 8, 1971.

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