Bibliographic Citation
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Title | Cyclic voltammetric behavior of uranyl ion in sulfuric acid solutions. Application to some nuclear materials characterization |
Creator/Author | Casadio, S. ; Lorenzini, L. |
Publication Date | 1973 Jan 01 |
OSTI Identifier | OSTI ID: 4399838 |
Other Number(s) | CODEN: ANALB |
Resource Type | Journal Article |
Resource Relation | Anal. Lett., v. 6, no. 9, pp. 809-820 |
Research Org | CNEN, Rome |
Subject | N40120 --Chemistry--Analytical & Separations Chemistry--Chemical & Spectral Procedures; URANIUM-- VOLTAMETRY;CATIONS;ELECTRODES;ELECTROLYTES;MERCURY;PHOSPHORIC ACID;POTASSIUM SULFATES;QUANTITATIVE CHEMICAL ANALYSIS;REDUCTION;SULFURIC ACID;URANYL COMPOUNDS;VALENCE ; Descriptor Groups (Splits): ;THORIUM COMPOUNDS-- URANIUM COMPOUNDS; ;URANIUM OXIDES |
Description/Abstract | U(VI) reduction at the mercury electrode in H/sub 2/SO/sub 4/ solutions was examined by cyclic voltametry.A diffusion coefficient, D, of (5.30 plus or minus 0.08) x 10/sup -6/ cm/sup 2//sec was obtained for the depolarizer at 25.0 plus or minus 0.2 deg C in 1N K/sub 2/SO/sub 4/ (pH = 2).In 1N K deg SO4/1N H/sub 2/SO/s ub 4/ systems the disproportionation of U(V) was found to occur with the constant rate of K/sub d//STAH/sup +/! = 6.500 plus or minus 1.000 M/sup -2/sec/sup -1/.In 1M H/sub 2/SO/sub 4/ supporting electrolyte pure kinetic control was achieved over the range of scan rates and uranyl concentration (C) investigated, hence linear correlation bctween cathodic peak current and C (above 5 x 10/sup -6/ M) was obtained.Strong complexing oxyanions, such as phosphate and pyrosulphate, do not interfere with the cathodic peak current.Rapid determination of O/U ratios in uranium oxides and of U in mixed U--Th materials were performed respectively in 1M H/sub 2/SO/sub 4// 1.5M H/sub 3/PO/sub 4/ and 1M H/sub 2/SO/sub 4//0.2M K/sub 2/S/sub 2/O/sub 4/ su pporting media, with a reproducibility of plus or minus 1.3%, standard deviation.(auth) |
Country of Publication | Italy |
Language | English |
System Entry Date | 2001 Jun 03 |
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