Precipitation of Thorium Oxalate from Nitric Acid Solutions

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Introduction. It has been known for a long time that thorium is precipitated by oxalic acid in acid solutions, but a survey of the literature showed no study of the limits of the acidity and oxalic acid excess which yield quantitative results. V. I. Spitzin reports on the solubility of thorium oxalate in varying concentrations of several acids, but the effect of an excess oxalic acid is not included. Since solutions are sometimes presented for analysis that contain more than the recommended two per cent mineral acid, it would be advantageous to be able to quantitatively remove the thorium without … continued below

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4 pages : illustrations

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Ayers, A. S. October 5, 1945.

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Introduction. It has been known for a long time that thorium is precipitated by oxalic acid in acid solutions, but a survey of the literature showed no study of the limits of the acidity and oxalic acid excess which yield quantitative results. V. I. Spitzin reports on the solubility of thorium oxalate in varying concentrations of several acids, but the effect of an excess oxalic acid is not included. Since solutions are sometimes presented for analysis that contain more than the recommended two per cent mineral acid, it would be advantageous to be able to quantitatively remove the thorium without otherwise altering the solutions. This was especially of interest in solutions containing bismuth, since it was hoped that some amounts of thorium could be precipitated in nitric acid solutions containing large quantities of bismuth. In removing the bismuth, first by a bismuth oxychloride precipitation, thee is every opportunity for carrying of the thorium.

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4 pages : illustrations

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Digitized from microopaque cards (1).

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  • SuDoc Number: Y 3.At 7:22/CC-2962
  • Report No.: CC-2962
  • Accession or Local Control No: metadc1256403
  • Archival Resource Key: ark:/67531/metadc1256403

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Precipitation of Thorium Oxalate From Nitric Acid Solutions (Report)

Precipitation of Thorium Oxalate From Nitric Acid Solutions

Report documenting the results of experiments to test the solubility of thorium oxalate in nitric acid solutions and effect of excess oxalic acid. it includes graphed and tabular results: "Tabulation of Results of Oxalate Precipitations."

Precipitation of Thorium Oxalate From Nitric Acid Solutions - ark:/67531/metadc1017820

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  • October 5, 1945

Added to The UNT Digital Library

  • Aug. 10, 2021, 7:39 a.m.

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  • Jan. 25, 2022, 10:40 a.m.

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Ayers, A. S. Precipitation of Thorium Oxalate from Nitric Acid Solutions, report, October 5, 1945; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1256403/: accessed June 23, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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