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Exchange Adsorption of Trace Quantities of Cadmium in Soils Treated with Calcium and Sodium: A Reappraisal¹

ABSTRACT

Cadmium was selectively adsorbed over Ca in Cecil, Winsum, and Yolo soils with up to 1.7% of the total cation exchange capacity occupied by Cd. Selectivity was greatest in Yolo and least in Cecil. Effects of undissociated Cd in solution were minor. Separation factors (K_s) decreased with increasing exchangeable Cd. Reexamination of Cd-Na exchange revealed that anomalous earlier results were due to the dispersion of organic matter during treatment with Na₂CO₃ in the preparation of Na-saturated soils. Na-Cd exchange was normal where organic matter loss was prevented.

¹ Contribution from the Agricultural Environmental Quality Institute, SEA, USDA, Beltsville Agric. Res. Center, Beltsville, MD 20705.

² Soil Scientists: Dr. J. V. Lagerwerff died 12 Sept. 1977.

Received for publication March 20, 1978. Accepted for publication August 16, 1978.