Electrochemical study of thorium in dimethylsulfoxide and propylene carbonate |
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Authors: | G. Duyckaerts Cl. Degueldre |
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Affiliation: | Laboratory of Analytical Chemistry and Radiochemistry, University of Liège, Sart Tilman, B-4000 Liège (Belgium) |
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Abstract: | Solutions of ThCl4 in anhydrous dimethylsulfoxide or propylene carbonate have been investigated by dc polarography and controlled potential chronoamperometry on a hanging mercury drop electrode. The results are interpreted by assuming that the cathodic reduction of thorium on mercury proceeds through one step Th(IV)+4 e→Th(0) (E1/2??1.65V vs. SCE in DMSO); however, the results obtained indicate that the reduction gives rise to the the formation of an autoinhibiting monoatomic layer of thorium; further reduction of thorium on this requires an overpotential (E1/2??2.15 V vs. SCE in DMSO).The mean value for the maximal superficial concentration of thorium in the film deduced from these experiments equals 1.25×10?9 mol cm?2, whereas the value for a hexagonal close-packed layer is 1.5×10?9 mol cm?2. |
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