engleski

The Influence of Rhodium(+3) on voltammetry of Selenium(+4) in perchloric acid

In comparison with previously described voltammetric behavior of selenium(+4) - rhodium(+3) system in sulfuric or hydrochloric acid, results obtained in 0.1 mol/L perchloric acid differ significantly. The difference includes: a) number of signals and conditions under which they appear b) current - concentration plots with nonzero intercepts c) unusual dependence of the peak characteristics on the speed of the applied technique and d) much more pronounced peak height enhancement. In square wave voltammetry the signal at - 0.75 V can be even 230 times higher with rhodium(+3) than without it. Most probably the peak at - 1.15 V corresponds to the catalytic reduction of hydrogen ions whereas the signal at - 0.75 V is additionally influenced by some other processes. Results are highly dependent on the form of rhodium(+3) in the initial solution and qualitatively similar to those previously obtained with sulfur compounds and dissolved metal catalysts.

Selenium; Rhodium; voltammetry; catalytic hydrogen evolution; rainwater

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