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Desorption of Ammonia from Soil During Displacement
Author(s) -
Rolston D. E.,
Nielsen D. R.,
Biggar J. W.
Publication year - 1972
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1972.03615995003600060021x
Subject(s) - desorption , sorption , soil water , chemistry , ammonia , displacement (psychology) , adsorption , environmental chemistry , analytical chemistry (journal) , soil science , geology , organic chemistry , psychology , psychotherapist
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.