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Spectroscopic speciation of aqueous Am(iii)-oxalate complexes.

H-K Kim1, K Jeong2, H-R Cho1

  • 1Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea. hkim11@kaeri.re.kr.

Dalton Transactions (Cambridge, England : 2003)
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Summary

This study reveals how americium(iii) interacts with oxalate ligands in groundwater, crucial for understanding actinide transport. We determined the formation constants of americium-oxalate complexes using advanced spectroscopy.

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Radiochemistry

Background:

  • Actinide transport in the geosphere is influenced by complexation with dissolved organic ligands in groundwater.
  • Carboxylic groups are abundant organic ligands in alkaline aquatic systems and interact with actinide ions.

Purpose of the Study:

  • To investigate the complexation of americium(iii) with organic carboxylic groups, specifically oxalate (Ox), in aqueous solution.
  • To quantitatively detect and characterize the Am(iii)-Ox species and determine their formation constants.

Main Methods:

  • Utilized UV-Vis spectrophotometry with a liquid waveguide capillary cell and time-resolved laser fluorescence spectroscopy.
  • Employed spectral deconvolution to resolve individual Am(iii)-Ox species spectra.
  • Performed density functional theory calculations to optimize complex geometry and analyze bonding.

Main Results:

  • Observed significant spectral shifts (red-shifts) and enhanced luminescence with increasing oxalate concentration.
  • Resolved spectra for AmOx+(aq), Am(Ox)2-(aq), and Am(Ox)33-(aq).
  • Determined apparent formation constants: log β1,1 = 5.34 ± 0.05, log β1,2 = 9.14 ± 0.18, and log β1,3 = 11.49 ± 0.30.
  • Spectroscopic data suggest bidentate, inner-sphere complexation of oxalate with Am(iii).

Conclusions:

  • Thorough spectroscopic characterization enabled the speciation and formation constant determination of Am(iii)-Ox complexes.
  • The study provides a spectroscopic approach applicable to investigating Am(iii) interactions with various ligands in aqueous solutions.
  • Understanding these interactions is vital for predicting actinide behavior in geological repositories and the environment.