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Replacement of Adsorbed Sodium in Soils by Hydrolysis of Calcium Carbonate
Author(s) -
Bower C. A.,
Goertzen J. O.
Publication year - 1958
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/sssaj1958.03615995002200010010x
Subject(s) - adsorption , leaching (pedology) , soil water , chemistry , calcareous , calcareous soils , sodium , calcium carbonate , inorganic chemistry , salt (chemistry) , langmuir , sodium carbonate , carbonate , hydrolysis , mineralogy , geology , soil science , organic chemistry , paleontology
The reaction 2Na adsorbed + CaCO 3 + H 2 O ⇆ Ca adsorbed + 2Na + + HCO 3 ‐ + OH ‐ has been studied from the standpoint of describing the replacement of adsorbed Na in calcareous soils subjected to leaching by rainfall. It has been found for the reaction in soils that the equilibrium between solution and adsorbed Na at various water contents can be expressed by the Langmuir equation: Na ad = (k 1 k 2 Na + )/(1 + k 1 Na + ) where k 1 and k 2 are constants, and Na ad and Na + are the adsorbed and solution concentrations of Na, respectively. As a consequence of this finding, it has been shown that the concentrations of solution and adsorbed Na at any depth in soil columns after a known amount of leaching with salt‐free water can be satisfactorily predicted by simplified, approximate solutions of equations derived by Thomas, Hiester, and Vermeulen. The results should be especially useful where calcareous soils, which have been affected by sea water, are subsequently leached by rain‐fall.