Sorption and desorption of technetium by humic substances under oxic and anoxic conditions

  • C. Wolfrum
  • K. Bunzl
Article

Abstract

The distribution coefficients Kd for the sorption of95mTc by peat as well as the corresponding rates of sorption and desorption were determined as a function of the concentration of the supporting electrolyte (CaCl2), the amount of dissolved oxygen and the pH of the solution. The results show that the Kd-values of Tc (added as Tc(VII)-pertechnetate) increase, if the concentration of CaCl2 or the amount of dissolved oxygen is decreased. The sorption was reversible with respect to the replacement of Tc by a CaCl2 solution. The half-times for the rates of sorption and desorption depend on the concentration of CaCl2 and dissolved oxygen and were in the range of 20–60 minutes and 500–900 minutes for the sorption and desorption processes, respectively.

Keywords

Oxygen Physical Chemistry Inorganic Chemistry Dissolve Oxygen CaCl2 

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Copyright information

© Akadémiai Kiadó 1986

Authors and Affiliations

  • C. Wolfrum
    • 1
  • K. Bunzl
    • 1
  1. 1.Institut für StrahlenschutzGesellschaft für Strahlen- und Umweltforschung mbH MünchenNeuherberg(FRG)

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