Premium
Ion Exchange Equilibria Involving Aluminum
Author(s) -
Nye Peter,
Craig Doris,
Coleman N. T.,
Ragland John L.
Publication year - 1961
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/sssaj1961.03615995002500010012x
Subject(s) - saturation (graph theory) , chemistry , ion exchange , kaolinite , sorption , electrolyte , montmorillonite , ion , inorganic chemistry , population , soil water , cation exchange capacity , analytical chemistry (journal) , mineralogy , adsorption , chromatography , organic chemistry , geology , soil science , demography , mathematics , combinatorics , electrode , sociology
Exchange isotherms determined for the K‐A1 ion pair with montmorillonite, kaolinite and two soils were S‐shaped. In dilute solutions (<0.05 N ), A1 was strongly preferred by exchange sites except at low levels of K‐saturation. In more concentrated solutions (0.1 to 0.25 N ), K was preferred when its saturation was less than about 30%, while A1 was more strongly sorbed over the remainder of the isotherms. In 1 N solution, K was bound more tightly than A1 over the entire range of ion saturation up to at least 90% K‐10% A1. In both dilute and concentrated solutions, A1 was preferred over Ca. In 1 N solution, A1 was bound much more tightly than Na. Because of the strong sorption of K, competing with A1 in concentrated solution, KCl should be an effective displacing agent for exchangeable A1. Exchange coefficients for the K‐A1 reaction, calculated according to the “equivalent fraction” equation, varied greatly, both with electrolyte concentration and exchange site population. The isotherms, though not described by a simple equation, are regarded as valuable indices of the exchange behavior of acid clays and soils.