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Sorption of Nitrogen Dioxide by Calcareous Soils¹

ABSTRACT

The NO₂ sorption capacity and rate of calcareous soils, a calcic soil, and a granular limestone were measured at room temperature by passing air or nitrogen gas containing NO₂ through them. In dry air (humidity < 5%), NO₂ sorption reached an equilibrium value within 2.5 min. In moist air (humidity > 95%), NO₂ sorption increased to as much as 10-fold that in dry air and approximately equaled the acid-titratable basicity of calcareous soils. The sorption rate was proportional to the unreacted fraction of the capacity with sorption rate constants ranging from 0.015 to 0.03 min^-1 at a NO₂ concentration of 0.5% volume. At a concentration of 0.1%, the sorption rate was slower but the capacity remained unchanged. Sorption of NO₂ was similar when either air or a nitrogen carrier was used.

¹ Contribution from the Dep. of Soils, Water, and Engineering, Univ. of Arizona, Tucson 85721. Supported in part by Rockefeller Grant 70073. Agr. Exp. Sta. Journal no. 2134.

² Graduate Assistant, Post doctoral Research Associate, and Associate Professor, respectively.

Received for publication June 6, 1973. Accepted for publication August 1, 1973.