Journal of Radioanalytical and Nuclear Chemistry

, Volume 134, Issue 2, pp 343–352 | Cite as

Determination of thorium isotopes in bastnaesite ores

  • L. Doretti
  • D. Ferrara
  • G. Barison


A procedure for the determination of alpha-emitting thorium isotopes in bastnaesite ores has been developed. The refractory sample was completely decomposed by potassium fluoride fusion in a platinum crucible followed by transposition to a pyrosulfate fusion. The pyrosulfate cake was dissolved in HCl and the resulting precipitate dissolved in DTPA solution; thorium was coprecipitated as hydroxide using cerium present in bastnaesite as natural carrier. Thorium was then extracted into a TOPO solution, separated by using Dowex 1-X8 for anionic exchange, electrodeposited and finally analyzed by alpha-spectrometry. Thorium was also determined spectrophotometrically using Arsenazo as a colorimetric reagent. The thorium yield of the above discussed chemical procedure is more than 85%.


Potassium Platinum Hydroxide Fluoride Cerium 
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Copyright information

© Akadémiai Kiadó 1989

Authors and Affiliations

  • L. Doretti
    • 1
  • D. Ferrara
    • 1
  • G. Barison
    • 1
  1. 1.Corso Stati Uniti, 4Servizio di Sicurezza del Lavoro e Protezione Sanitaria del CNRPadova(Italy)

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