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Insight of solvent extraction process: Reassessment of trace level determinations.

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This study demonstrates selective iron removal from uranium samples using tri-n-butyl phosphate (TBP) solvent extraction. It establishes cation-cation interactions, enabling efficient separation without interference from other ions.

Keywords:
Cation-cation interactionsInner sphere complexesSolvent extraction separationSpectrophotmetryThermophysical studies

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Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Radiochemistry

Background:

  • Solvent extraction is a crucial technique for separating uranium.
  • Tri-n-butyl phosphate (TBP) is widely used for uranium separation.
  • Iron (Fe) co-extraction with TBP presents a challenge in uranium analysis.

Purpose of the Study:

  • To develop a selective method for iron removal from uranium samples using TBP.
  • To investigate the interactions between uranium and iron during solvent extraction.
  • To establish the mechanism of cation-cation interactions (CCIs) in the TBP system.

Main Methods:

  • Solvent extraction using only tri-n-butyl phosphate (TBP).
  • Spectrophotometric studies to analyze complex formation.
  • Thermophysical studies to confirm cation-cation interactions (CCIs).

Main Results:

  • Established the existence of cation-cation inner sphere complexes between UO2(2+) and Fe(3+) in both aqueous and organic phases.
  • Achieved selective separation of iron from uranium matrix using only TBP.
  • Demonstrated minimal interference from aluminum and copper during iron extraction.

Conclusions:

  • Pure TBP can selectively remove iron from uranium samples for the first time.
  • Cation-cation interactions (CCIs) play a key role in the separation mechanism.
  • The developed method shows excellent reproducibility and robustness for elemental profiling.