STRONTIUM ADSORPTION BY NONCALCAREOUS SOILS-EXCHANGEABLE IONS AND SOLUTION COMPOSITION EFFECTS

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Abstract
The effects of solution composition, electrolyte concentration and exchangeable ions on Sr2+ adsorption by noncalcareous soils at low levels of Sr2+ loading were studied, and the distribution coefficients of Sr2+ and the selectivity coefficient for Sr-Ca adsorption were calculated. The distribution coefficient was independent of Sr2+ loading; this coefficient was strongly dependent on salt concentration, cation species (Na vs. Ca) and pH. The selectivity coefficient, .**GRAPHIC**. was < 1 for wide ranges of pH and ionic strength and increased with pH. H+ and Ca2+ exerted specific depressing effects on Sr2+ adsorption. The data supported the existence of specific adsorption sites for Sr on hydrous oxides and clay mineral edges.