The preparation of polonium metal and polonium dioxide

Bagnall, Kenneth W.; D'Eye, R. W. M.

doi:10.1039/jr9540004295

Cited by 22 publications

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“…13 An aqueous solution of 2 × 10 −3 M Po in 0.8 M HC1 was electrolyzed and Po metal was deposited on precipitated Ag, Ni and Cu. Metallic Po was subsequently electrolytically deposited on Pt.…”

Section: Metallic Poloniummentioning

confidence: 99%

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Polonium: Inorganic Chemistry

Zingaro¹

2005

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The chemistry of polonium is quite limited. Because all of the isotopes of this element are radioactive, and because it is available in such limited quantities, research with polonium is difficult. The metal has been isolated and characterized. Although a number of polonium compounds, such as PoO2 have been well characterized, the evidence for many is insubstantial. Among the halide derivatives, PoCl4 has been studied in greatest detail. A number of other halides, and their complex ions such as PoBr6‐2, have been studied with considerable success. A simple binary nitride has never been prepared, and only indirect evidence for the existence of H2Po has been reported.

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Section: Metallic Poloniummentioning

confidence: 99%

“…28 The free element was produced by electrochemical deposition on platinum. The Po metal dissolves readily in dilute nitric acid and yields an unknown white solid.…”

Section: Chlorine Compounds Of Poloniummentioning

confidence: 99%

Polonium: Inorganic Chemistry

Zingaro¹

2005

Encyclopedia of Inorganic and Bioinorganic Chemistry

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“…The oxide system is quite well known [3,25] ; the stable oxide is Po0 2 , formed from the elements at 250 °C. It sublimes at 885 °C in oxygen at 1 atmosphere and decomposes to the metal at 500 °C in a vacuum.…”

Section: Frontispiece] and There Is A Goodmentioning

confidence: 99%

“…7 H 2 0 is obtained -this could, however, be a mixture. The pentahalides in fuming nitric acid yield the hydrated oxytrinitrate, PaO (N0 3 ) 3 · 4 H 2 0 in which the Pa-0 vibration appears at 770 cm -1 , indicating a dimeric oxygen bridged compound, again in contrast to monomeric NbO (N0 3 ) 3 . The stability to hydrolysis of Pa(V) in sulphuric acid is quite well known and when the hydroxide is dissolved in concentrated sulphuric acid with a little hydrofluoric acid and the latter is fumed off, white crystals of H 3 PaO (S0 4 ) 3 separate [37]; the corresponding selenium compound is made in the same way.…”

Section: Frontispiece] and There Is A Goodmentioning

confidence: 99%

“…Because of its high specific activity, chemical studies with weighable amounts of polonium are greatly influenced by radiation effects, particularly radiation decomposition, problems which are largely non-existent in the case of protactinium. Thus organic materials are rapidly charred, polonium iodate decomposes with the visible evolution of iodine and suspensions of polonium salts in anhydrous liquid ammonia, primary or secondary amines are reduced to the metal, probably by atomic hydrogen liberated by the α-bombardment [1], The effects of radiation in solution are also severe ; as an example, a M/1000 solution of a 210 Po compound contains nearly 1000 curies of α activity per litre and the radiation decomposition of the solvent is visible as a continuous evolution of gas [2,3]. The radiolysis products are strong oxidising agents so that bivalent polonium in solution is oxidised to polonium(IV) in about 8 minutes [4]; this time is independent of the polonium concentration since it is the polonium «-particles which produce the oxidising agent.…”

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The Chemistry of Weighable Amounts of Polonium and Protactinium

Bagnall

1966

Radiochimica Acta

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Some of the problems involved in chemical studies with polonium (138.4 day 210 Po) and the much less intensely radioactive protactinium (32,600 yr. 231 Pa) are discussed and the handling of these two α-active isotopes is briefly described. The chemistry of polonium and protactinium, particularly the halides and nitrates, is reviewed in the light of their positions in the Periodic Table. Zusammenfassung Einige beim chemischen Arbeiten mit Polonium (138,4 T. 210 Po) und dem viel weniger radioaktiven Protactinium (32600 J. 231 Pa) auftretende Probleme werden diskutiert und die Handhabung dieser beiden α-aktiven Isotope kurz beschrieben. Die Chemie des Po und Pa, speziell der Halogenide und Nitrate, wird unter dem Aspekt ihrer Stellung im Periodischen System besprochen. Résumé On discute de quelques problèmes posés lors de l'expérimentation sur le polonium ( 210 Po, 138,4 jours) et le protactinium ( 231 Pa, 32.600 ans) beaucoup moins radioactif. La manipulation de ces isotopes actifs est brièvement décrite. La chimie du Po et du Pa, en particulier les halogénures et nitrates, est résumée en fonction de leur place dans la classification périodique des éléments. * Lecture delivered at the symposium "progress in natural radioactivity" held in Munich from May 24-25, 1965 by the "Fachgruppe Kern-Radio-und Strahlenchemie der Gesellschaft Deutscher Chemiker". * Vorgetragen auf dem Symposium "Fortschritte auf dem Gebiet der natürlichen Radioaktivität" am 24. u. 25. Mai in München.

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Polonium: Inorganic Chemistry

Zingaro

2005

Encyclopedia of Inorganic Chemistry

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The preparation of polonium metal and polonium dioxide

Cited by 22 publications

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Polonium: Inorganic Chemistry

Polonium: Inorganic Chemistry

The Chemistry of Weighable Amounts of Polonium and Protactinium

Polonium: Inorganic Chemistry

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