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Soil Science Society of America Journal Abstract -

Sorption of Cadmium by Calcareous Soils: Influence of Solution Composition1


This article in SSSAJ

  1. Vol. 48 No. 6, p. 1244-1247
    Received: Oct 24, 1983
    Accepted: May 7, 1984

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  1. G. A. O'Connor,
  2. Candice O'Connor and
  3. G. R. Cline2



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 Cd2+ activities as predicted by GEOCHEM. Additional consideration, however, must be given to complementary (competing) ion activities.

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