Article

Polarographic Eiectroreduction of Some Complexes of Uranium with Macrocyclic Polyethers

Constantin Luca Department of Analytical Chemistry, Faculty of Chemical Technology, Folytechnical Institute of Bucharest, 79611, Bucharest, RomaniaMohamed Magdi Khalil Department of Chemistry, Faculty of Science, University of Assiut, Assiut, A.R., EgyptI. Gh. Tănase Department of Analytical Chemistry, Faculty of Chemical Technology, Folytechnical Institute of Bucharest, 79611, Bucharest, Romania

Analytical Lettersjournal1985en

ABI

Abstract

Abstract The polarographic behaviour of uranium(VI) in aqueous C. 1 N nitric acid medium, in the presence of some polyoxa macrocyclic ligands (15-crown-5, benzo-15-crown-5, 18-crown-6, dicyclohexyl-18-crown-6), at 25°C, was investigated. Both in the absence and in the presence of the polyoxa macrocyclic ligands, the reduction of hexavalent uranium in aqueous medium takes place in two steps, each of which involving the transfer of an electron. Under diffusion-controlled conditions, the two steps of the reduction in acid medium proceed reversibly. The results of the polarographic measurements enabled to estimate the ratio of the stability constants of the complex ions of U(111) and of U(IV) with macrocyclic polyethers. Key Words: Stability constantscrown etherspolarography

Topics

Electrochemical Analysis and Applications Electrochemical sensors and biosensors Analytical Chemistry and Sensors

Identifiers

DOI: 10.1080/00032718508068620

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