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Nitric Oxide Sorption by Calcareous Soils: III. Effects of Temperature and Lack of Oxygen on Capacity and Rate¹

ABSTRACT

The sorption of NO by oven-dry soils from dry air (relative humidity < 5%) containing a concentration of 1.5% NO by volume decreases exponentially with increasing temperature from 24 to 120C. From a moist stream (relative humidity > 95%), both NO and H₂O sorption capacities and rates decrease with increasing temperature from 24 to 77C. The sorption capacity of NO relative to H₂O changes little, while the relative sorption rate to that of H₂O decreases markedly when the temperature increases from 24 to 36C but not for higher temperatures. The lack of gaseous oxygen severely inhibits the sorption of NO from both dry and moist nitrogen gas streams.

¹ Contribution from the Dep. of Soils, Water & Engineering, The Univ. of Arizona, Tucson, Ariz. 85721. Arizona Agr. Exp. Sta. Paper no. 2200. Supported in part by Rockefeller Foundation Grant 70073.

² Research Assistant and Post-doctoral Research Associate, respectively.

Received for publication October 30, 1973. Accepted for publication March 22, 1974.