Isolation of Transplutonium Elements on Ionites in Aqueous–alcohol Media

Guseva, L. I.; Lebedev, I.A.; Myasoedov, Β. F.; Tikhomirova, G. S.

doi:10.1016/b978-0-08-020638-7.50013-0

Cited by 9 publications

(7 citation statements)

References 1 publication

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“…Anion-exchange chromatography using HNO 3 −MeOH or NH 4 SCN−MeOH have been widely used for the separation of Am from rare earth elements. − The adopted scheme was based on a method described by Yamato . Am and light REEs are loaded onto an anion-exchange column in 1 M HNO 3 −93% MeOH (Figure ).…”

Section: Discussionmentioning

confidence: 99%

Radiochemical Determination of ²⁴¹Am and Pu(α) in Environmental Materials

Warwick

Croudace

2001

Anal. Chem.

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Americium-241 and plutonium determinations will become of greater importance over the coming decades as 137Cs and 241Pu decay. The impact of 137Cs on environmental chronology has been great, but its potency is waning as it decays and diffuses. Having 241Am and Pu as unequivocal markers for the 1963 weapon fallout maximum is important for short time scale environmental work, but a fast and reliable procedure is required for their separation. The developed method described here begins by digesting samples using a lithium borate fusion although an aqua regia leachate is also effective in many instances. Isolation of the Am and Pu is then achieved using a combination of extraction chromatography and conventional anion exchange chromatography. The whole procedure has been optimized, validated, and assessed for safety. The straightforwardness of this technique permits the analysis of large numbers of samples and makes 241Am-based techniques for high-resolution sediment accumulation rate studies attractive. In addition, the technique can be employed for the sequential measurement of Pu and Am in environmental surveillance programs, potentially reducing analytical costs and turnround times.

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Section: Discussionmentioning

confidence: 99%

Radiochemical Determination of ²⁴¹Am and Pu(α) in Environmental Materials

Warwick

Croudace

2001

Anal. Chem.

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“…It is known that actinides and light lanthanides are also sorbed along with Pb and Bi on anion exchangers from aqueous-methanol nitric acid solutions [13][14][15]. However, as shown above, high distribution coefficients of these elements are attained only in solutions with the HNO 3 concentration of ≥0.5 M, containing more than 80% methanol.…”

Section: Anion Exchangermentioning

confidence: 90%

“…The distribution coefficients of Pb are lower than those of Bi. Therefore, the solutions containing ≤80% CH 3 OH can be used for separation of Pb and Bi on small anion-exchange columns and for their separation from TPE and other elements that are weakly sorbed from such solutions [13][14][15]. Figure 7 shows the elution curves of the 212 Pb/ 212 Bi couple from the column containing 100 mg of Dowex 1×8 resin, with a 1 M solution of HNO 3 in 60% CH 3 OH as eluent.…”

Section: Anion Exchangermentioning

confidence: 98%

A study of the ion-exchange behavior of Pb and Bi as homologs of elements 114 and 115, respectively, in aqueous and aqueous-methanol solutions of HNO3

Guseva

2012

Radiochemistry

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The ion-exchange behavior of Pb and Bi as homologs of elements 114 and 115, respectively, in aqueous and aqueous-methanol solutions of HNO 3 was studied. The distribution coefficients of Bi, Pb, Ra, and some actinides between the ion exchangers and HNO 3 solutions were determined in relation to the acid and methanol concentrations in the solution and to the kind of the ion exchanger. The distribution coefficients of Bi and other elements under consideration in sorption on the cation and anion exchangers from mixed aqueousmethanol HNO 3 solutions differ considerably. The optimum conditions were found for the isolation of carrierfree short-lived Pb and Bi isotopes and for their separation from actinides and other elements using the ion exchangers and aqueous-methanol HNO 3 solutions. The possibility of repeated isolation of short-lived Bi isotopes with their simultaneous separation from the long-lived parent radionuclides (Ac, Ra, Pb) on the cation exchanger (radioisotope generators) using mixed HNO 3 /CH 3 OH solution and of on-line preconcentration of these isotopes on the anion exchanger was demonstrated.The synthesis of superheavy elements (SHEs) with Z = 113-118, accomplished at the Flerov Laboratory of Nuclear Reactions (Dubna, Russia), is an experimental proof of the existence of the "islands of stability," hypothesized as early as the middle of the XX century. This success opens wide prospects for studying the chemistry of these elements [1].A study of the chemical properties of SHEs, determining their position in the periodic table, is one of priority problems of the modern radiochemistry. Data obtained in this field will expand our knowledge of the structure of atom electronic shells and will allow us to reveal relativistic effects associated with the electronic structure of heavy element atoms. Because of short lifetime of SHEs and low cross sections of their production in nuclear reactions, study of the chemistry of these elements is difficult and labor-consuming. For isolation of SHEs from irradiated targets, their chemical identification, and study of their behavior in various systems, specific methods and approaches are being developed using as examples their light homologs, as a rule, in the carrier-free state [2,3]. The most promising for studying the SHE chemistry in solutions are chromatographic methods allowing the speciation, complexation, oxidation state, and other chemical properties to be studied on high reliability level with ultrasmall amounts of elements.Previously we studied the ion-exchange behavior of Pb and Bi as homologs of elements 114 and 115, respectively, in solutions of hydrohalic acids and showed that, in dilute HCl and HBr solutions, these elements form strong neutral and anionic complexes sorbed by the anion exchanger [3][4][5][6][7]. This study deals with the ion-exchange behavior of carrier-free short-lived isotopes of Pb and Bi in aqueous and aqueous-methanol solutions of nitric acid and is aimed to examine the chemical forms and complexation of these isotopes in dilute HN...

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“…The application of the aqueous-alcohol solutions has made it possible to essentially enhance the efficiency of radioactive elements' separation on ionites [14].…”

Section: Sorptionmentioning

confidence: 99%

Modern Methods of Separation and Determination of Radioactive Elements

Myasoedov

1988

Radiochimica Acta

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Isolation of Transplutonium Elements on Ionites in Aqueous–alcohol Media

Cited by 9 publications

References 1 publication

Radiochemical Determination of ²⁴¹Am and Pu(α) in Environmental Materials

Radiochemical Determination of ²⁴¹Am and Pu(α) in Environmental Materials

A study of the ion-exchange behavior of Pb and Bi as homologs of elements 114 and 115, respectively, in aqueous and aqueous-methanol solutions of HNO3

Modern Methods of Separation and Determination of Radioactive Elements

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Isolation of Transplutonium Elements on Ionites in Aqueous–alcohol Media

Cited by 9 publications

References 1 publication

Radiochemical Determination of 241Am and Pu(α) in Environmental Materials

Radiochemical Determination of 241Am and Pu(α) in Environmental Materials

A study of the ion-exchange behavior of Pb and Bi as homologs of elements 114 and 115, respectively, in aqueous and aqueous-methanol solutions of HNO3

Modern Methods of Separation and Determination of Radioactive Elements

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Radiochemical Determination of ²⁴¹Am and Pu(α) in Environmental Materials

Radiochemical Determination of ²⁴¹Am and Pu(α) in Environmental Materials