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Sorption of Cadmium by Calcareous Soils: Influence of Solution Composition
Author(s) -
O'Connor G. A.,
O'Connor Candice,
Cline G. R.
Publication year - 1984
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/sssaj1984.03615995004800060008x
Subject(s) - sorption , cadmium , freundlich equation , desorption , calcareous , adsorption , chemistry , soil water , environmental chemistry , calcareous soils , inorganic chemistry , soil science , geology , organic chemistry , paleontology
Cadmium sorption‐desorption by three Ca‐saturated, calcareous soils was studied in the presence of various Ca salts. Cadmium retention was extensive in all soil‐solution systems and was best characterized by a two‐part Freundlich relationship. Part I of the isotherm was interpreted to represent Cd retention by highly Cd‐specific adsorption sites, while part II of the isotherm represented a mixture of highly Cd‐specific and nonspecific adsorption sites. This interpretation was supported by desorption data. Differences in Cd sorption from various Ca solutions were at least partially rationalized by considering free Cd 2+ activities as predicted by GEOCHEM. Additional consideration, however, must be given to complementary (competing) ion activities.