Sorption of Nitrogen Dioxide by Calcareous Soils
- Robert J. Prather,
- Seiichi Miyamoto and
- Hinrich L. Bohn
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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