Electrochemical oxidation of americium in pyrophosphate solutions

Journal Article · Tue Mar 01 00:00:00 EST 1988 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:6281112

Kulyako, Yu M; Trofimov, T I; Lebedev, I A; Myasoedov, B F

We studied the electrochemical oxidation of Am(III) in H/sub 4/P/sub 2/O/sub 7/, Na/sub 4/P/sub 2/O/sub 7/, and (NH/sub 4/)/sub 4/P/sub 2/O/sub 7/ solutions over a wide pH range, i.e., 0.5 to 10. Trivalent americium at +1.9 V anodic oxidized completely to Am(IV) in 0.1-1 M pyrophosphate solutions at pH less than or equal to 1. The Am(III) in alkaline solution fully oxidized to Am(VI) which could then be reduced to Am(V). At higher oxidation states americium is stable enough in pyrophosphate solutions to be useful in analytical methods. We measured formal oxidation potentials of Am(IV)/Am(III) and Am(VI)/Am(V) couples in pyrophosphate solutions and found them to reach record low values of +1.24 V in 1 M (NH/sub 4/)/sub 4/P/sub 2/O/sub 7/ at pH 6 (the IV/III couple) and +1.06 V in 0.1 M Na/sub 4/P/sub 2/O/sub 7/ at pH 10 (the VI/V couple).

• OSTI ID: 6281112
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Vol. 29:4; Other Information: Translated from Radiokhimiya; 29: No. 4, 494-500(Jul-Aug 1987)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMERICIUM COMPOUNDS
ELECTROLYSIS
OXIDATION
PYROPHOSPHATES
REDOX POTENTIAL
ABSORPTION SPECTRA
AMERICIUM 241
AMERICIUM 243
AQUEOUS SOLUTIONS
OXIDIZERS
POTASSIUM COMPOUNDS
POTENTIOMETRY
REDUCTION
SPECTROPHOTOMETRY
VALENCE
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALKALI METAL COMPOUNDS
ALPHA DECAY RADIOISOTOPES
AMERICIUM ISOTOPES
CHEMICAL REACTIONS
DISPERSIONS
HEAVY NUCLEI
ISOTOPES
LYSIS
MIXTURES
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
RADIOISOTOPES
SOLUTIONS
SPECTRA
TITRATION
TRANSPLUTONIUM COMPOUNDS
TRANSURANIUM COMPOUNDS
YEARS LIVING RADIOISOTOPES
400201* - Chemical & Physicochemical Properties