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TitleThe determination of thorium in ores by the column method
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorGuest, R J
SourceCanada Department of Mines and Technical Surveys, Mines Branch, Technical Paper no. 1, 1953, 24 pages, https://doi.org/10.4095/327605 Open Access
logo Open Access
Year1953
PublisherCanada Department of Mines and Technical Surveys
Documentserial
Lang.English
File formatpdf
Subjectsgeneral geology; geochemistry; radioactive minerals; Science and Technology; thorium; thorium geochemistry; radioactivity; sampling methods; analytical methods; experiments
Illustrationsfigures; tables; graphs
Released1953 01 01; 2020 12 08
AbstractThe report describes a method for the determination of thorium in radioactive ores. Thorium nitrate and uranyl nitrate are extracted with ether containing nitric acid in the presence of activated alumina and activated cellulose contained in a water-jacketed glass column. Uranium and thorium are then separated by a second column extraction using different concentrations of ether-nitric solvent, or by an oxalate precipitation of thorium. The thorium is finally precipitated as the oxalate and the precipitate ignited and weighed as thorium oxide. Microgram amounts of thorium can be determined colorimetrically with 1-(o-arsonophenylazo) -2-naphthol-3, 6-disulphonic acid. This method is used in conjunction with the column method when the amount of thorium oxide in the sample is one percent or less. Samples containing as low as 0.001 percent thorium oxide can be analysed successfully. By using lanthanum as a carrier, small amounts of thorium may be recovered by means of an oxalate precipitation. The method compares favourably in rapidity and accuracy with other analytical methods for the determination of thorium in ores.
GEOSCAN ID327605

 
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