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The Effect of Carbon Dioxide on the Chemisorption of Ammonia by Base-saturated Clays¹

ABSTRACT

The presence of CO₂ increased and stabilized the effective retention of ammonia, applied as aqua ammonia, by base-saturated clays. Ca²⁺- and Mg²⁺-bentonites particularly showed a striking increase in the retention of ammonia in the presence of CO₂.

It is postulated that the Ca²⁺ and Mg²⁺ exchanged by ammonia, are precipitated as highly insoluble compounds thus stabilizing the retention of chemisorbed ammonia.

¹ Contribution from the Department of Agronomy, Virginia Polytechnic Institute, Blacksburg, Virginia.

² Graduate Research Assistant, presently Chief Professional Officer in the Chemistry Section, Agr. Res. Inst. Glen, Orange Free State Region, Republic of South Africa, and Associate Professor of Agronomy, respectively.

Received for publication September 17, 1965. Accepted for publication July 7, 1966.