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Selenite Adsorption on Alluvial Soils: II. Solution Composition Effects¹

ABSTRACT

The adsorption envelope for selenite on two alluvial soils from the San Joaquin Valley, California, was investigated with respect to variations in solution composition. Sodium-saturated soil pastes were mixed with solutions containing sulfate, phosphate, and Ca ions in a background electrolyte of 50 mol NaCl m^–3. The effects of increasing chloride concentration were investigated at 100 mol NaCl m^–3. No discernible change in the amount of selenite adsorbed was found as a result of increased chloride concentration or through the addition of 16 mmol Na₂SO₄ kg^–1. In contrast, an initial concentration of phosphate comparable to that of selenite resulted in a decrease of selenite adsorbed by approximately one-half. The addition of 100 mol CaCl₂ m^–3 resulted in significant increases in selenite adsorption on both soils above pH 5, which could be attributed to precipitation or an increase of surface charge through Ca adsorption.

¹ Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521, and Dep. of Agronomy, Ohio State Univ., Columbus, OH 43210.

² Postdoctoral Soil Scientist, Professor of Soil Science, Research Associate IV (UCR), and Assistant Professor of Soil Physical Chemistry (OSU), respectively.

Received for publication December 8, 1986.