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Nitric Oxide Sorption by Calcareous Soils: II. Effect of Moisture on Capacity, Rate, and Sorption Products¹

ABSTRACT

At room temperature, the nitric oxide (NO) sorption capacity of calcareous soils increased with the presence of moisture in an air + NO stream (1.5% NO by volume) and/or in the soils. The largest increase, up to 10-fold or approximately to the acid-titratable basicity of soils, occurred when NO and H₂O were sorbed simultaneously by initially dry soils from a moist air (humidity > 95%) + NO stream. The sorption rates were proportional to the unused portion of the capacity with the rate constants ranging from 0.02 to 0.03 min^-1 for NO and 0.01 to 0.015 min^-1 for H₂O under simultaneous sorption. Initially moist soils sorbed NO from a dry air (humidity < 5%) + NO stream until the soils dried. The rate of NO sorption slowed at initial soil water suctions less than approximately 1 bar. Sorbed NO was recovered as nitrate and reacted with the basicity in moist soils. Less than 20% of the sorbed nitrogen was lost upon heating at 105C for 24 hours.

¹ Contribution from the Dep. of Soils, Water, and Engineering, Univ. of Arizona, Tucson 85721. Supported in part by Rockefeller Foundation Grant 70073. Ariz. Agr. Exp. Sta. no. 2108.

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

Received for publication May 25, 1973. Accepted for publication September 10, 1973.