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The Influence of Rhodium(+3) onVoltammetry of Selenium(+4) in Perchloric Acid
Author(s) -
Zelić Marina
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200403245
Subject(s) - rhodium , perchloric acid , chemistry , sulfuric acid , selenium , inorganic chemistry , catalysis , metal , hydrochloric acid , voltammetry , sulfur , electrochemistry , analytical chemistry (journal) , electrode , chromatography , organic chemistry
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.