Modeling the mass-transfer rate of radioactive cobalt from a synthetic groundwater to volcanic Tuff media Article

cited authors

  • Gopala Rao, M; Fuentes, HR; Polzer, WL; Essington, EH

fiu authors


  • The application of a shrinking-core model controlled by macroporous diffusion has been validated for the adsorption kinetics of radioactive Co from a 0.01 N CaCl2 solution to Bandelier Tuff. This tuff has served as a natural barrier in the disposal of low-level radioactive waste at Los Alamos National Laboratory. The model is validated for duplicate experiments and also in binary and ternary combinations with Sr and Cs. The sorbates were initially in solution at 20 mg L-1 and were contacted with the tuff in bottles agitated in the batch mode at 25°C. The shrinking-core model is compared with traditional models of rate control by chemical reaction, film and particle diffusion. The results have direct implications in the understanding and modeling of the fate and transport of radioactive Co in volcanic tuffs. Volcanic tuff is also being considered as a medium for the location of a high-level nuclear waste respository in the State of Nevada. © 1990.

publication date

  • January 1, 1990

Digital Object Identifier (DOI)

start page

  • 69

end page

  • 84


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