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This article in SSSAJ

  1. Vol. 37 No. 6, p. 860-863
    Received: June 6, 1973
    Accepted: Aug 1, 1973

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Sorption of Nitrogen Dioxide by Calcareous Soils1

  1. Robert J. Prather,
  2. Seiichi Miyamoto and
  3. Hinrich L. Bohn2



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.

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