NATURE OF THE REDUCTION OF URANIUM SPECIES IN SULPHURIC ACID SOLUTION

Journal Article · Thu Jan 01 04:00:00 EST 1959 · J. Polarog. Soc.

OSTI ID:4172874

Elving, P J; Krivis, A F; Bauer, H H

The heterogeneous rate constarit, k/sub e/, and the transfer coefficient, alpha , were measured for thc electrode processes in the successive a-c polarographlc reductions of uranium in sulfuric acid solution from U(VI) to U(III). For a solution 1.28 mM in uranyl ion and 0.18 M in H/sub 2/SO/sub 4/, k/ sub e/, the rate of the electrode reaction at a standard state or the equilibrium potential, was found to be 6.1 x 10/sup -2/ and 3.1 x 10/sup -2/ cm/sec for the U(VI)-U(V) and U(IV)-U(III) reductions, respectively; alpha , defined as the fraction of the applied potential effective in the forward reaction, was found to be 0.62 and 0.71, respectively. The a-c efficiency, P, defined as the ratio of the observed faradaic admittance to that calculated from theory, was found to be 0.18 and 0.19 in the same order, which means that these reductions are partially reversible with an a-c efficiency of about 20%. Since no a-c polarographic wave could be observed for the U(V)-U(IV) reduction (i.e., P = 0), it is irreversible from the a-c point of view. These results were obtained in the frequency range 100 to 1000 cps. (D.L.C.)

• Research Organization: Univ. of Michigan, Ann Arbor
• NSA Number: NSA-14-013675
• OSTI ID: 4172874
• Journal Information: J. Polarog. Soc., Journal Name: J. Polarog. Soc. Vol. Vol: No. 2
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
CURRENTS
ELECTRIC POTENTIAL
ELECTRODES
FARADAY CURRENT
IMPURITIES
IONS
MEASURED VALUES
POLAROGRAPHY
REDUCTION
SOLUTIONS
SULFURIC ACID
URANIUM
URANYL COMPOUNDS