Cyclic voltammetry hexacyanoferrate

M.F.S. Teixeira, A. Segnini, F.C. Moraes, L.H. Marcolino, O. Fatibello, and E.T.G. Cavalheiro, Determination of vitamin B-6 (pyridoxine) in pharmaceutical preparations by cyclic voltammetry at a copper(II) hexacyanoferrate(III) modified carbon paste electrode. J. Brazilian Chem. Soc. 14, 316-321... 

The electrodes modified by hexacyano-ferrates compounds were also used as voltammetric sensors [409-412]. The cadmium hexacyanoferrate-based composite ion-sensitive electrode for voltammetry was explored by Scholz and coworkers [409]. The potential of such electrode depends linearly on the logarithm of concentration of alkali and alkaline-earth metals ions in the solutions. Bo and fin have studied [410] Prussian blue (PB)/Pt modified electrode in GdGh electrolyte by cyclic voltammetry and in situ Fourier transform IR spectroscopy (FTIR) spectro-electrochemistry. Cadmium hexacyanofer-rates were formed on a PB film. 

Cyclic voltammetry of LaNi03 in the presence of the hexacyanoferrate system and deconvolution of Faradaic and surface processes by means of the RRDE are depicted in Fig. 5. Steady-state results obtained for the hexacyanoferrate redox couple at LaNiO, in alkaline solutions were similar to those reported for La05Sr05CoO3 with very fast kinetics, comparable with the reaction on platinum electrodes, and convective-diffusional limiting currents which obey the Levich equation are observed close to the equilibrium potential (Fig. 5). 

Figure II.8.3 gives two examples, one for the dependence of a voltammetric peak potential of copper reduction on the composition of copper sulfide-selenide solid solutions, and one for the dependence of the formal potentials (mid-peak potentials from cyclic voltammetry) of mixed iron-copper hexacyanoferrates on the composition of these compounds. The copper sulfide-selenides behave in very nonideal fashion, whereas the solid solution hexacyanoferrates give, within the limit of experimental errors, an almost linear dependence. These and other examples [18-21] are well suited to show that by voltammetric measurements of immobilized microparticles it is extremely facile to answer the two questions, is it a solid solution or not, and what is its composition.

The anodic oxidation of AA on a ruthenium oxide hexacyanoferrate-modified electrode is characterized by cyclic voltammetry... 

Cyclic voltammetry of the hexacyanoferrate(II/III) couple. Hexacyanoferrate(II) 5 x 10 M, 0.1 M KCl scan rate 20 mVs . a) Graphite spray electrode b) glassy carbon electrode c) carbon-polyethylene electrode d) carbon paste electrode. 

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