Modeling Adsorption of Mixtures of Radionuclides by Zeolitized Tuff

by M. Gopala Rao, Howard Univ, Washington, United States,

Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1993


Multi-solute sorption isotherms were measured using 'nonscents', a zeolitized volcanic tuff material from Southeast Arizona. Isotherms for the three constituent binaries, Sr-Co, Cs-Sr and Cs-Co in the ternary system Cs-Sr-Co were obtained using a columnar flow technique. Results clearly show that sorbent-phase selectivity has considerable effect on the sorption process. Presence of cesium in the mixture considerably reduced the expected retardation of solutes Sr and Co in the tuff material. Cobalt is the least favored ion of the ternary system on the sorbent phase. The isotherms were correlated with ion-exchange phase equilibrium model. Equilibrium constant for the three binary pairs, and the sorbent phase ionic activity coefficients were calculated. Triangle rule of the ion exchange phase equilibria has been validated for the Cs-Co-Sr-Nonscents system. Sorbent phase selectivities for the ternary system have been successfully predicted for an experimental run.

Subject Headings: Adsorption | Radioactive materials | Mixtures | Sorption | Mathematical models | Equilibrium | Mathematics | Minerals | Arizona | United States

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