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 language | English |
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Pages (from-to) | 443-449 |
Number of pages | 7 |
Journal | Radiochimica Acta |
Volume | 108 |
Issue number | 6 |
DOIs | |
State | Published - Jun 1 2020 |
Externally published | Yes |
Keywords
- Solvent extraction
- rhenium
- technetium