Electrochemical reduction of actinide ions in aqueous solution

David, F.; Maslennikov, A. G.; Peretrukhin, V.F.

doi:10.1007/bf02039610

Cited by 17 publications

(10 citation statements)

References 21 publications

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“…Moreover, actinides in the amalgam, prepared by electrolysis from Brought to you by | Brigham Young University Authenticated Download Date | 11/18/14 10:52 AM aqueous acetate solutions, were observed in the mercury as a solid intermetallic phase, for instance PuHg n with n = 3-5. They were prepared as metals or alloys after distillation of the mercury (with a total plutonium yield more than 90%) [20] verifying again that no hydrolysis is maintaining the elements in the aqueous phase or at the interface. The mechanism of the "radiocoulometric" experiment has been established [12,[20][21][22] which is in good agreements with experimental data obtained with control potential reaction.…”

Section: Existence Of Low Oxidation States Of Lanthanides and Actinidmentioning

confidence: 99%

About low oxidation states, hydration and covalence properties of f elements

David¹

2008

Radiochimica Acta

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Lanthanides / Actinides / Redox properties / Hydration / CovalenceSummary. The existence of low oxidation states of lanthanides and actinides in aqueous solution has been reexamined in the light of recent data. The retained redox data corresponding to the 3 + /2+ couples are given, and earlier reports of the existence of monovalent mendelevium is not confirmed. By comparing divalent, trivalent and tetravalent ions, the effective charges of the lanthanide and actinide ions have been quantified. It is shown, based on experimental EXAFS data, and modelling of the aquo ions, that the covalent effect in these series increases with the oxidation state, is larger for actinides than for lanthanides and maximum for trivalent and tetravalent ions at the beginning of the series and, in each case, becoming negligible around the middle of the series. For divalent ions this covalent effect is small and constant through the series. Characteristics of the ions have been evaluated and hydration properties deduced.

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Section: Existence Of Low Oxidation States Of Lanthanides and Actinidmentioning

confidence: 99%

About low oxidation states, hydration and covalence properties of f elements

David¹

2008

Radiochimica Acta

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“…Several studies have been reported in acetic acid for the preparation of uranium-mercury amalgams [47,[82][83][84][85]. The experimental set-up usually consisted of an electrochemical cell equipped with a cation exchange membrane which maintains the pH of the catholyte at a constant value.…”

Section: Electrochemical Preparation In Acetic Acidmentioning

confidence: 99%

“…Open Sci. 9: 211870 [83]. At −1.8 V versus NHE (standard hydrogen electrode), the catholyte was either nickel chloride or tin chloride solution.…”

Section: Electrochemical Preparation In Acetic Acidmentioning

confidence: 99%

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Synthetic diversity in the preparation of metallic uranium

et al. 2022

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Uranium metal is associated with several aspects of nuclear technology; it is used as fuel for research and power reactors, targets for medical isotope productions, explosive for nuclear weapons and precursors in synthetic chemistry. The study of uranium metal at the laboratory scale presents the opportunity to evaluate metallic nuclear fuels, develop new methods for metallic spent fuel reprocessing and advance the science relevant to nuclear forensics and medical isotope production. Since its first isolation in 1841, from the reaction of uranium chloride and potassium metal, uranium metal has been prepared by solid-state reactions and in solution by electrochemical, chemical and radiochemical methods. The present review summarizes the methods outlined above and describes the chemistry associated with each preparation.

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“…Md 2þ ) at À0.1 V. David (1986a) estimated E (Md 3þ ! Md 0 ) to be À1.74 V. David et al (1981David et al ( , 1990a measured À(1.51 AE 0.01) V for the polarographic E ½ of the couple Md 2þ ! Md 0 which (with correction for amalgamation potential of 1.0 V) yields an estimated E (Md 2þ !…”

Section: Solution Chemistrymentioning

confidence: 99%

Fermium, Mendelevium, Nobelium, and Lawrencium

Silva

The Chemistry of the Actinide and Transactinide Elements

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Because of conflicting claims, the International Union of Pure and Applied Chemistry (IUPAC) recently reviewed the names of all the trans-fermium elements; Mu ¨nzenberg (1999) has published a detailed discussion of the problems and the resolution. First, a Transfermium Working Group decided the priority of discoveries. Next, the discoverers proposed names to the IUPAC and names were officially accepted by that body. The names for the elements mendelevium, nobelium, and lawrencium were retained as originally proposed at the time of their discoveries.As of this writing, the number of known isotopes of Fm, Md, No, and Lr is 58, ranging in half-life from as short as 0.25 ms for 250 No to as long as 100.5 days for 257 Fm. Relativistic effects have been predicted to affect ground state electronic configurations, ionic radii, and oxidation state for the heavier actinides. While the 3þ oxidation state remains a dominant feature of the heavier actinides, a tendency toward the formation of lower oxidation states has emerged. Divalency had been observed in solution for fermium through nobelium, in fact, the elements Fm, Md, and No are divalent in the metallic state. Due to increased 5f electron binding of the filled 5f 14 shell, the 2þ oxidation state is the most stable in aqueous solution for nobelium. However, lawrencium, the last member of the actinide series, returns to the 3þ oxidation state as the most stable in aqueous solution, as predicted (Seaborg, 1949).

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Electrochemical reduction of actinide ions in aqueous solution

Cited by 17 publications

References 21 publications

About low oxidation states, hydration and covalence properties of f elements

About low oxidation states, hydration and covalence properties of f elements

Synthetic diversity in the preparation of metallic uranium

Fermium, Mendelevium, Nobelium, and Lawrencium

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