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Violeta Hansen

Speciation analysis of I-129, Cs-137, Th-232, U-238, Pu-239 and Pu-240 in environmental soil and sediment

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  • Jixin Qiao, Tech Univ Denmark, Technical University of Denmark, Ctr Nucl Technol
  • ,
  • Violeta Hansen
  • Xiaolin Hou, Tech Univ Denmark, Technical University of Denmark, Ctr Nucl Technol
  • ,
  • Ala Aldahan, United Arab Emirates Univ, United Arab Emirates University, Dept Geol
  • ,
  • Goran Possnert, Uppsala Univ, Uppsala University, Tandem Lab

The environmental mobility and bioavailability of radionuclides are related to their physicochemical forms, namely species. We here present a speciation analysis of important radionuclides including I-129 (also I-127), Cs-137, Th-232, U-238 and plutonium isotopes (Pu-239 and Pu-240) in soil (IAEA-375) and sediment (NIST-4354) standard reference materials and two fresh sediment samples from Ovre Heimdalsvatnet Lake, Norway. A modified sequential extraction protocol was used for the speciation analysis of these samples to obtain fractionation information of target radionuclides. Analytical results reveal that the partitioning behaviour, and thus the potential mobility and bioavailability, are exclusively featured for the individual radionuclide. Iodine is relatively mobile and readily binds to organic matter, while plutonium is mainly bound to both organic matter and nitric acid leachable fractions. Thorium is predominated in nitric acid leachable fraction and caesium is primarily observed in nitric acid and aqua regia leachable fractions and residue. Our analytical results reveal that around 50% of uranium might still remain in the residue which could not be extracted with aggressive acid, namely, aqua regia. (C) 2012 Elsevier Ltd. All rights reserved.

TidsskriftApplied Radiation and Isotopes
Sider (fra-til)1698-1708
Antal sider11
StatusUdgivet - aug. 2012
Eksternt udgivetJa

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