Electrochemical oxidation of americium in pyrophosphate solutions
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), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 29:4; ISSN SVRDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTRA
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALKALI METAL COMPOUNDS
ALPHA DECAY RADIOISOTOPES
AMERICIUM 241
AMERICIUM 243
AMERICIUM COMPOUNDS
AMERICIUM ISOTOPES
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
DISPERSIONS
ELECTROLYSIS
HEAVY NUCLEI
ISOTOPES
LYSIS
MIXTURES
NUCLEI
ODD-EVEN NUCLEI
OXIDATION
OXIDIZERS
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
POTASSIUM COMPOUNDS
POTENTIOMETRY
PYROPHOSPHATES
RADIOISOTOPES
REDOX POTENTIAL
REDUCTION
SOLUTIONS
SPECTRA
SPECTROPHOTOMETRY
TITRATION
TRANSPLUTONIUM COMPOUNDS
TRANSURANIUM COMPOUNDS
VALENCE
YEARS LIVING RADIOISOTOPES