Abstract
The adsorption of trace radioactive cesium by sediments from the Savannah River Plant area follows a theoretically expected linear relationship between ln Kd* and the pH of the equilibrium solution, where Kd* is the equilibrium distribution coefficient: Cs adsorbed (meq g−1)/Cs+ in solution (meq ml−1). Theoretically, the slope of these plots is proportional to the fraction of surface area occupied by pH dependent charges. Experimentally, the slope becomes zero after removal of hydroxy Al interlayers with citrate pretreatment. Hydroxy Al interlayers are thus the main source for the pH dependent charges making Cs+ adsorption pH dependent.
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