Speciation of Chromium by Adsorptive Stripping Voltammetry Using Pyrocatechol Violet

Abstract

A procedure was proposed for the speciation of chromium by differential pulse adsorptive stripping voltammetry (DPAdSV) using pyrocatechol violet (PCV) as a complexing agent. In this procedure a partial least squares regression (PLS) was used for the resolution of the strongly overlapping voltammetric signals from mixtures of Cr III and Cr VI in the presence of PCV. The application of a genetic algorithm to select some of the predictors variables (potentials of the voltammogram) allows one to considerably reduce the number of experimental variables, but does not diminish the prediction capacity of the PLS model constructed with these selected variables. The relative error in absolute value is less than 5 % when concentrations of several mixtures are calculated. The analysis of the possible effect of the presence of foreign ions in the solution was performed. The procedure was successfully applied to the speciation of chromium in the waste water from a tanning factory.

A novel hydrogen peroxide sensor based on multiwalled carbon nanotubes/poly(pyrocatechol violet)‐modified glassy carbon electrode

“…Pyrocatechol violet (PCV, with the chemical structure shown in Scheme 1), a dye in the triphenylmethane series, has been used for the determination of Al 3þ32,33 and other metal ions. 34 The monomer dyes possess very good electrocatalytic activity toward the redox of small molecular compounds such as ascorbic acid and dopamine, 35 hydrazine, 36 and NADH, 37 displaying excellent electron transform efficiency as an electron transfer mediator. Recently, Zheng and coworkers 38 reported H 2 O 2 determination using carbon ceramic electrodes modified with PCV.…”

A study of nanostructured gold modified glassy carbon electrode for the determination of trace Cr(VI)

“…9 Therefore, electrochemical methods have been applied for the determination of chromium, which have shown numerous advantages including speed of analysis, good selectivity and sensitivity. [10][11][12][13] Metal nanoparticles have shown superior or advantageous properties for a wide range of technological applications, [14][15][16][17] and they provide three important functions for electroanalysis: improved mass transport, high effective surface area, and catalytic properties. 18 Many methods were reported to synthesize metal nanoparticles including reduction with different reagents, 19 UV light or electron-beam irradiation 20 and electrochemical methods.…”

Aluminum Speciation with Adsorptive Pyrocatechol Violet-Al(III) Complex by Derivative Adsorption Chronopotentiometry

“…At pH 4.9, the derivative of the adsorption chronopotentiogram of the solution containing 1.5610 À6 mol dm À3 PCV, gives only one reduction peak at À0.60 V [35,36]. When 5610 À7 mol dm À3 Al III is added, a new peak appears at À0.78 V. Increasing the Al III concentration results in a decrease of the first peak and a growth in the second peak.…”