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Sorption of Cadmium by Calcareous Soils: Influence of Solution Composition¹

ABSTRACT

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.

¹ Journal Article 1052, Agric. Exp. Stn., New Mexico State Univ., Las Cruces, NM 88003. This research was conducted under contract DE-ACO4-83AL 21776 with the Dep. of Energy.

² Professor, Undergraduate, and Research Specialist, respectively, New Mexico State Univ., Dep. of Crop and Soil Sciences, Las Cruces, NM 88003.

Received for publication October 24, 1983. Accepted for publication May 7, 1984.

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