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Nitrate Adsorption by Some Volcanic-ash Soils of Southern Chile¹

ABSTRACT

Nitrate adsorption by several soils was determined as the difference between the NO₃^- added and that remaining in the supernatant liquid. A nitrate ion electrode method, which was checked against a phenoldisulfonic method, was used to determine the NO₃^- remaining in the supernatant liquid.

The time required for equilibrations was 16 hours. The amount of NO₃^- adsorbed varied from 1.2 to 7.5 meq/100 g of soil from a 0.05M NO₃^- solution for soils of pH values ranging from 5.3 to 6.1. The amount adsorbed increased with decreasing pH.

¹ Contribution from the Dep. of Inorganic and Analytical Chemistry Facultad de Ciencias Quimicas, Univ. de Chile and the Dep. of Soil Science and Agricultural Engineering, Univ. of California, Riverside. The financial support of the Convenio Univ. de Chile-Univ. of California, and Grant no. GB 11711 of the National Science Foundation is gratefully acknowledged.

² Professor of Analytical Chemistry, Univ. of Chile, Professor of Soil Science, Univ. of California, Riverside, and former graduate student, College of Chemical Sciences, Univ. of Chile, respectively.

Received for publication July 2, 1973. Accepted for publication August 27, 1973.