La chromatographic sur papier du protactinium

Vernois, J.

doi:10.1016/s0021-9673(00)93400-9

Cited by 13 publications

(1 citation statement)

References 6 publications

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“…On the other hand, Schulz (1972) reported good extraction of 233 Pa by DIBC from 7.4 M HNO 3 solutions containing 1.4 M Th (NO 3 ) 4 and 480 Ci L -1 of 233 Pa. Macroscopic amounts of 233 Pa have also been recovered from HNO 3 solutions of irradiated ThO 2 by adsorption on powdered unfired Vycor glass and silica gel (Moore and Rainey, 1964;Goode and Moore, 1967); at tracer levels, 233 Pa has been separated from Th targets by adsorption on silica gel Spitsyn et al, 1969;Chang et al, 1974;Chang and Ting, 1975b), on quartz sand (Sakanoue and Abe, 1967), and on activated charcoal saturated with PAA (Pal'shin et al, 1966). Separations with cation and chelating resins (Kurodo and Ishida, 1965;Myasoedov et al, 1969), by paper chromatography and paper electrophoresis (Vernois, 1958(Vernois, , 1959Myasoedov et al, 1969), and by reversed-phase partition chromatography (Fidelis et al, 1963) have also been reported.…”

Section: Preparation Of Pure 233 Pamentioning

confidence: 99%

Protactinium

Myasoedov¹,

Kirby²,

Тананаев³

The Chemistry of the Actinide and Transactinide Elements

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Section: Preparation Of Pure 233 Pamentioning

confidence: 99%

Protactinium

Myasoedov¹,

Kirby²,

Тананаев³

The Chemistry of the Actinide and Transactinide Elements

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Die Chemie des Protactiniums

Keller

1966

Angewandte Chemie

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Protactinium zeigt in seinen chemischen Reaktionen ein recht zwiespältiges Verhalten. In nichtwäßrigen Lösungsmitteln sowie bei festkörperchemischen Untersuchungen besitzt sowohl vier‐ als auch fünfwertiges Protactinium Eigenschaften, die es als typisches Actinidenelement charakterisieren. Dagegen erweist sich fünfwertiges Protactinium bei Untersuchungen in wäßriger Lösung als Homologes der Elemente Niob und Tantal. Es zeigt – außer in flußsauren Lösungen – eine starke Tendenz zu irreversiblen Hydrolysen‐ und Kondensationsreaktionen, was dazu führt, daß sich Tracermengen (ca. 10−12 Mol/l) und makroskopische Mengen (10−3−10−6 Mol/l) Protactinium häufig unterschiedlich verhalten. Durch Reduktion mit starken Reduktionsmitteln erhält man wäßrige Lösungen von Pa(IV), dessen Eigenschaften wieder weitgehend denjenigen von Th(IV) und U(IV) entsprechen und keine Beziehungen zu Nb(IV) aufweisen. Unsere Kenntnisse vom chemischen Verhalten dieses seltenen Radioelements wurden besonders durch die Gewinnung von 100 g reinen Protactiniums – der bisher größten Menge – aus Rückständen der englischen Uranfabrikation in den Jahren 1958–1960 gefördert.

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The Chemistry of Protactinium

Keller

1966

Angew. Chem. Int. Ed. Engl.

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AND INSTITUT FUR RADIOCHEMIE, GESELLSCHAFT FUR KERNFORSCHUNG MBH., KERNFORSCHUNGSZENTRUM KARLSRUHE (GERMANY) Dedicated to Professor W. Klemm in honor of his 70th birthday Protactinium exhibits an ambivalent chemical behavior. In non-aqueous solutions and in the solidstate, both quadrivalent and quinquevalent protactinium has properties which characterize it as a typical actinide element. On the other hand, investigations in aqueous solution show quinquevalent protactinium to be a homologue of niobium and tantalum. It exhibitsexcept in hydrofluoric acid solutionsa marked tendency to undergo irreversible hydrolysis and condensation reactions, which leads to the situation that tracer amounts (ca. 10-12 molell) and macroscopic amounts (10-3-10-6 molell) of protactinium often behave differently. Reduction with strong reducing agents gives aqueous solutions of Pa(IV), the properties of which again correspond in general to those of Th(IV) and show no relation to Nb(IV). Our knowledge of the chemical behavior of this rare radioelement has been advanced, in particular, by the production in 1958-1960 of 100 g of pure protactiniumthe largest amount so far -from residues of the British production of uranium. ringt1] later found this intermediate (ux2 = 234mPa) [ l ] K . Fnjans and 0. GdrrinR, Naturwissenschaften I , 339 (1913). Element 91, protactinium, comes between thorium and uranium in the periodic table. On the basis of the radioactive displacement laws, FajanS, Russell, and SOddY 91. Fajans and Aiigcrv. Chrni. iiitcriiot. Edit. V d . 5 (1966) No. I

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La chromatographic sur papier du protactinium

Cited by 13 publications

References 6 publications

Protactinium

Protactinium

Die Chemie des Protactiniums

The Chemistry of Protactinium

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