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Stability of Th(IV) polymers measured by electrospray mass spectrometry and laser-induced breakdown detection

  • Clemens WaltherEmail author
  • Markus Fuss
  • Sebastian Büchner
  • Horst Geckeis
Article

Abstract

The formation of polynuclear thorium hydroxide complexes in acidic aqueous solutions is observed by electrospray mass spectrometry. Size, number of hydroxide ligands and charge of all complexes in solution are identified independently. By repeated measurements over a time span of up to 418 days the stability of the polymers is observed. At concentrations above [Th(IV)]tot = 10 mM pentamers and dimers are the dominant stable species. In contrast, the fractions of pentamers initially present at [Th(IV)]tot = 0.2 mM decrease within less than 4 weeks, correlated with the formation of nm-sized colloids observed by LIBD indicating an Ostwald-ripening like process.

Keywords

Thorium Polymerization Colloid Electrospray Laser-induced breakdown detection 

Notes

Acknowledgments

We thank Marcus Altmaier (INE) for preparation of the stock solution and, together with Volker Neck, for many fruitful discussions. We also thank Oliver Schwindt for LIBD and the INE analytics group for ICP MS measurements. Finally, we acknowledge financial support by the “Programm Nuklear” and by the “Helmholtz Russia Joint Research Group” of the Helmholtz Gemeinschaft Deutscher Forschungszentren (HGF).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2009

Authors and Affiliations

  • Clemens Walther
    • 1
    Email author
  • Markus Fuss
    • 1
  • Sebastian Büchner
    • 1
  • Horst Geckeis
    • 1
  1. 1.Institute for Nuclear Waste Disposal, Forschungszentrum KarlsruheKarlsruheGermany

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