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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
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Going deeper into plutonium sorption affected by redox.

Anna Yu Romanchuk1, Alexander L Trigub2, Stepan N Kalmykov1

  • 1Lomonosov Moscow State University, Department of Chemistry, Leninskie Gory 1/3, 119991 Moscow, Russia.

Journal of Contaminant Hydrology
|July 18, 2024
PubMed
Summary
This summary is machine-generated.

Plutonium sorption onto goethite differs based on oxidation conditions. Under oxidizing conditions, Pu(VI) remains hexavalent, while under normal conditions, Pu(IV) stabilizes on the mineral surface.

Keywords:
GoethitePlutoniumRedoxSorptionThermodynamic modeling

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Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Radiochemistry

Background:

  • Understanding plutonium (Pu) behavior in geological environments is crucial for nuclear waste management.
  • Goethite is a common iron oxyhydroxide mineral in soils and sediments, influencing radionuclide fate.
  • Plutonium speciation and sorption are highly dependent on environmental conditions like redox potential and pH.

Purpose of the Study:

  • To investigate the sorption of Plutonium(VI) (Pu(VI)) onto synthesized goethite under varying redox conditions (oxidizing vs. normal).
  • To determine the pH dependence of Pu sorption across different solid/liquid ratios.
  • To characterize plutonium speciation in both the solid (goethite) and aqueous phases.

Main Methods:

  • Sorption experiments conducted under controlled oxidizing and normal conditions.
  • Extended X-ray absorption fine structure (EXAFS) spectroscopy for solid-phase Pu speciation.
  • Ultraviolet-visible (UV-Vis) spectroscopy and liquid-liquid extraction for solution-phase Pu speciation.

Main Results:

  • Pu(VI) remained hexavalent on the goethite surface and in solution under oxidizing conditions.
  • Under normal conditions, Pu(IV) was stabilized on the goethite surface, while Pu(V) was observed in solution.
  • Plutonium sorption exhibited pH dependence, influenced by the solid/liquid ratio.

Conclusions:

  • Plutonium speciation and sorption behavior are significantly altered by redox conditions and pH.
  • Goethite acts as a sorbent influencing Pu valence state stabilization.
  • The study provides thermodynamic descriptions for these plutonium-goethite interactions.