Influence of technetium and rhenium speciation on their sorption on natural sorbents

Abstract

Natural sorbents are mostly useful for retardation of the radionuclides. In this study, the possibility to apply the natural sorbents as carrier materials for radiopharmaceutical in vitro applications has been tested. The sorption experiments with technetium-99 have been carried out on bentonite R. The Kd values have been determined using the batch method. The results of the comparative study of the determination of the distribution coefficient by radiometric and polarographic methods are discussed from point of view of sorbed radionuclides speciation. The DPP polarografic reduction of ammonium pertechnetate and potassium perrhenate has been studied in aqueous solution with a variety of supporting electrolytes. The formation of the rhenium and technetium complexes as a function of the aqueous phase pH has been studied by the polarographic method.

Chalcogen-Based Aerogels As Sorbents for Radionuclide Remediation

“…The mobility of TcO 4 − in subsurface water is fairly significant; it would not be mitigated by sorption or solubility limitations. 21 Several different types of sorbents have been investigated for capturing Tc that include ion-exchange materials, 22 activated carbon, 23 and natural minerals such as bentonite 24 and goethite. 18 On the other hand, 129 I typically exists as iodide or iodate species upon introduction into aqueous solution.…”