Abstract
AbstractFormation of soluble complexes usually lowers sorption of metals by soils. The purpose of this study was to determine if changes in free Ni2+ or Sr2+ activity could explain differences in isotherms obtained in highly complexing SO2‐4 systems vs. slightly complexing Cl‐ systems. Sorption of Ni and Sr by homoionic montmorillonite and soil was studied using the batch isotherm technique. The Na+ (0.1N) and Ca2+ (0.02N) solutions of Cl‐ and SO2‐4 with Ni or Sr (10−6 to 10−4M) yielded systems in which up to 45% of soluble metal (M) was present as MSO04. Sorption was greater in the Cl‐ vs. the SO2‐4 systems at the same total M (Ni or Sr) concentration at equilibrium. Plotting data in terms of free M2+ activity at equilibrium eliminated significant differences between corresponding isotherms. Sorption thus appeared to be controlled by M2+ activity. The data supported the hypothesis that MSO04 complexes were not sorbed and MCl+ complexes sorbed only slightly if at all. Nickel sorption was greater than Sr sorption under similar conditions. The results illustrate the importance of correcting for ionic strength/ion pairing effects before making comparisons among isotherms.
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