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Desorption of Ammonia from Soil During Displacement¹

ABSTRACT

The displacement and desorption of ammonia from ovendry and moist soil were evaluated using a miscible displacement technique. An ammonia saturated soil atmosphere was displaced from soil columns with nitrogen at flow velocities of approximately 2.5 cm min^-1. Samples of gas from within and at the end of soil columns, analyzed by titration methods, were used to obtain elution curves. Two different soils were studied at several water contents. Experimental, steady-state sorption isotherms (sorption as a function of gaseous concentration) were determined for oven-dry soil. An assumption that gas is perfectly mixed within the soil column during desorption was used to derive a model describing displacement with ammonia desorbing according to a nonlinear isotherm. This perfect mixing model in conjunction with calculated sorption isotherms adequately predicted the displacement of ammonia from oven-dry and moist soils during desorption.

¹ Contribution from the Dep. of Water Sci. and Eng., Univ. of California, Davis.

² Assistant Professor of Soil Physics, Dep. of Soils and Plant Nutrition, and Professors of Water Sci., Dep. of Water Sci. and Eng., Univ. of California, Davis 95616, respectively.

Received for publication September 24, 1971. Accepted for publication July 26, 1972.