redox reactions of uranium in the presence of potassium 2-phospho-17-tungstate

Journal Article · Tue Jul 01 00:00:00 EDT 1986 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:7194711

Maslov, L P; Rykov, A G; Sirotinkina, L V

The redox reactions of uranium in the presence of potassium 2-phospho-17-tungstate (17W2P) - K/sub 10/P/sub 2/W/sub 17/O/sub 61/ - were studied by the methods of spectrophotometry and potentiometry. It was established that in the presence of 17W2P the UO /SUP 2/2/ /sup +/ ion is reduced by iron(II) to uranium(IV) as a result of the binding of U(IV) into a strong complex with composition (U(p/sub 2/W/sub 17/O/sub 61/)/sub 2/)/sup 16 -/. The peculiarities of the coordination of uranium(IV) by voluminous 17W2P ligands are the cause of the different nature of its interaction with various types of oxidizing agents. It was established that under the action of oxidizing agents (K/sub 2/Cr/sub 2/O/sub 7/, KMnO/sub 4/), the reduced form of which is a complex with 17W2P, there is a conversion of the complex of uranium(IV) to the corresponding complex of uranium(V), evidently with conservation of a structure analogous to that for uranium(IV). It was also shown that uranium(IV) in complex with 17W2P is practically not oxidized in the cold by persulfate ions which react according to a radical mechanism, whereas weaker oxidizing agents, for example, H/sub 2/O/sub 2/, oxidize it to the UO /SUP 2/2/ /sup +/ ion. Hypotheses are advanced on the possible mechanisms of the occurrence of the corresponding reactions.

• OSTI ID: 7194711
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Vol. 27:5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
POTASSIUM TUNGSTATES
REDOX POTENTIAL
URANIUM
OXIDATION
REDUCTION
CHEMICAL PROPERTIES
COMPLEXOMETRY
FEASIBILITY STUDIES
OXIDIZERS
PHOSPHORUS COMPOUNDS
POTENTIOMETRY
REDOX REACTIONS
REDUCING AGENTS
SPECTROPHOTOMETRY
URANIUM COMPLEXES
URANYL COMPOUNDS
VALENCE
ACTINIDE COMPLEXES
ACTINIDE COMPOUNDS
ACTINIDES
ALKALI METAL COMPOUNDS
CHEMICAL REACTIONS
COMPLEXES
ELEMENTS
METALS
POTASSIUM COMPOUNDS
TITRATION
TUNGSTATES
URANIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties