G. V. Loon, J. A. Page
Mar 1, 1965
Citations
0
Influential Citations
9
Citations
Journal
Talanta
Abstract
Abstract The polarography of the aquo and chloride species of rhodium(III) has been investigated. The aquo complex was prepared by fuming in perchloric acid, and the various chloride complexes were prepared by heating in the presence of chloride ion. In all cases, polarography gave irreversible diffusion controlled waves. It is essential that the solution constituents be carefully reproduced for analytical polarography, and that the solutions be stabilised by heating, because equilibrium is established very slowly at room temperature. Mercury cathode electrolysis at a controlled potential showed that the polarographic reduction step involved 3 electrons. This is used as the basis of a coulometric determination of 1.5- to 15-mg amounts of rhodium in 0.2–0.4 M chloride electrolyte at a potential of −0.2 V vs . SCE.