Premium
A Suggested Mechanism for Sulfate Adsorption by Soils
Author(s) -
Chang Monica L.,
Thomas Grant W.
Publication year - 1963
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/sssaj1963.03615995002700030020x
Subject(s) - adsorption , ion , sulfate , subsoil , chemistry , salt (chemistry) , kaolinite , hydrolysis , inorganic chemistry , soil water , mineralogy , geology , organic chemistry , soil science
Equilibrium experiments with SO 4 ‐Cl mixtures suggested that the quantity of anions held by a Cecil subsoil increases with time. Further experiments with K 2 SO 4 confirmed the “time” effect on two Cecil subsoils and on Fe‐treated Georgia kaolinite. On the basis of the time effect and other observations made on SO 4 2‐ adsorption a suggested mechanism is proposed. The mechanism envisions the replacement of OH ‐ ions by SO 4 2‐ and the hydrolysis of Al (in the presence of salt) to form H + ions. Thus, the OH ‐ ions are neutralized by H + ions and anion adsorption proceeds apace.