Comparison of ReO4-and TcO4-in solvent extraction systems

Cecilia Eiroa-Lledo, Lindsey Lecrivain, T. Gannon Parker, Donald E. Wall, Nathalie A. Wall

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The suitability of perrhenate (Re(VII)) to act as an analog for pertechnetate (Tc(VII)) was tested using solvent extraction and the carrier/tracer systems 99Tc(VII)/99mTc(VII) and 185/187Re/186/188Re(VII). Perrhenate is often used as a non-radioactive analogue of pertechnetate, but scarce data is available for the comparison of these metals for liquid-liquid extraction applications. Results show that neither Tc(VII) nor Re(VII) extraction is influenced by pH in the 2-8 range. The anion extractant also separates electrolyte anions, with increasing extraction following the order Cl- < NO3- << ClO4-, resulting in a decreased Tc(VII) and Re(VII) extraction in presence of salt. In particular, the extraction of Re and Tc is suppressed in presence of NaCl at concentrations higher than 1 mM. While Tc extraction is larger than that of Re in absence of electrolyte, they are statistically identical in presence of enough electrolyte. Furthermore, tetraphenylphosphonium chloride (Ph4PCl) is a stronger extractant than iodonitrotetrazolium chloride (INT).

Original languageEnglish
Pages (from-to)443-449
Number of pages7
JournalRadiochimica Acta
Volume108
Issue number6
DOIs
StatePublished - Jun 1 2020
Externally publishedYes

Keywords

  • Solvent extraction
  • rhenium
  • technetium

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