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ADSORPTION OF CADMIUM AND ITS EXCHANGE CHARACTERISTICS IN SOME ISRAELI SOILS
Author(s) -
NAVROT J.,
SINGER A.,
BANIN A.
Publication year - 1978
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1978.tb00799.x
Subject(s) - adsorption , cadmium , soil water , chemistry , cation exchange capacity , ion exchange , montmorillonite , ion , partition coefficient , environmental chemistry , mineralogy , inorganic chemistry , analytical chemistry (journal) , chromatography , soil science , geology , organic chemistry
Summary Cd adsorption isotherms were measured on five Israeli soils ranging in specific surface area from 65 to 315m 2 /g. Retention capacity of Cd ranged from 4.7 × 10 3 to 10 × 10 3 μg/g soil (8.4 to 17.9 mequiv/100 g soil) and was correlated with the specific surface area. Almost all the adsorbed Cd was exchangeable with 0.5 M CaCl 2 and the remaining fraction was extractable in 0.5 M HCl. Plots of K d , the distribution coefficient of Cd between the solid and solution phases, vs. Γ, the surface density of adsorbed Cd, showed that all soils behave similarly, K d sharply diminishing with Γ. It was suggested, based on comparison with literature data on Cd adsorption on montmorillonite, that below γ s 0. 5 × 10 17 ions/m 2 , specific adsorption mechanisms prevail whereas above it the adsorption is mainly due to electrostatic interactions and ion exchange.