Water, Air, and Soil Pollution

, Volume 205, Issue 1–4, pp 251–257 | Cite as

Dissolution Factors of Ta, Th, and U Oxides Present in Pyrochlore

  • K. Dias da Cunha
  • M. Santos
  • F. Zouain
  • L. Carneiro
  • G. Pitassi
  • C. Lima
  • C. V. Barros Leite
  • K. C. P. Dália
Article

Abstract

Air pollution can be a problem in industrial processes, but monitoring and controling the aerosols in the work place is not enough to estimate the occupational risk due to dust particle inhalation. The solubility in lung fluid is considered to estimate this risk. The aim of this study is to determine in vitro specific dissolution parameters for thorium (Th), uranium (U), and tantalum (Ta) associated to crystal lattice of a niobium mineral (pyrochlore). Th, U, and Ta dissolution factors in vitro were obtained using the Gamble solution (simulant lung fluid, SLF), particle induced X-ray emission, and alpha spectrometry as analytical techniques. Ta, Th, and U are present in the pyrochlore crystal lattice as oxide; however, they have shown different dissolution parameters. The rapid dissolution fraction (fr), rapid dissolution rate (λr), slow dissolution rate (fs), and slow dissolution fraction (λs) measured for tantalum oxide were equal to 0.1 and 0.45 and 0.00007 day−1, respectively. For uranium oxide, fr was equal to 0.05, λr was equal to 1.1 day−1, and λs was equal to 0.000068 day−1. For thorium oxide, fr was 0.025, λr was 1.5 day−1, and λs was 0.000065 day−1. These results show that chemical behavior of these three compounds in the SLF could not be represented by the same parameter. The ratio of uranium concentration in urine and feces samples from workers exposed to pyrochlore dust particle was determined. These values agree with the theoretical values of estimated uranium concentration using specific parameters for uranium oxide present in pyrochlore.

Keywords

Thorium Uranium Tantalum Solubility Pyrochlore 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • K. Dias da Cunha
    • 1
    • 2
  • M. Santos
    • 1
  • F. Zouain
    • 1
    • 2
  • L. Carneiro
    • 1
  • G. Pitassi
    • 2
  • C. Lima
    • 2
  • C. V. Barros Leite
    • 2
  • K. C. P. Dália
    • 3
  1. 1.Instituto de Radioproteção e Dosimetria (IRD/CNEN)Rio de JaneiroBrazil
  2. 2.Pontifícia Universidade Católica do Rio de Janeiro (PUC-RIO)Rio de JaneiroBrazil
  3. 3.Universidade Federal do Rio de Janeiro (UFRJ)Rio de JaneiroBrazil

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