Abstract
AbstractThe exchange adsorption of Cd has been studied in Cecil sandy loam (clay fraction 45% kaolinite and 25% vermiculite), Winsum clay loam (clay fraction 80% illite), and Yolo silt loam (clay fraction 47% montmorillonite and 22% mica). Experimental variables were the major cations Al3+, Ca2+, and Na+, salt (chloride) levels (from 5 to 50 meq/liter), and the initial concentration of CdCl2 (from 22 to 170 µeq/liter). The exchange of Cd2+ in Al3+‐ and Ca2+‐treated soils was normal in that the adsorption was greater in the presence of Ca2+ than of Al3+, and decreased with increasing concentration of AlCl3 or CaCl2. In the Na+‐treated, alkalized soils, Cd2+ did not precipitate. The exchange was unusual because the adsorption of Cd2+ decreased as NaCl concentrations decreased. The same behavior was shown by 109Cd2+. At NaCl concentrations decreasing below 30 meq/liter, the adsorption of Ca2+ by Na+‐treated soils also decreased, as did the adsorption of Na+. The result was attributed to decreasing soil exchange capacity with decreasing NaCl concentration due to increased adsorption of products derived from alkaline corrosion of the soil matrix.
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