Application of an Optimization Procedure of Adsorptive Stripping Voltammetry for the Determination of Chromium in Wine

Abstract

A procedure for the determination of chromium in wine by differential pulse adsorptive stripping voltammetry (DPAdSV), using different complexing agents (TTHA, DTPA and Cupferron), has been optimized. The selection of the experimental conditions was made using experimental design methodology. Under these conditions the calibrations were made and the detection limit was determined for each complexing agent. The lowest detection limit (4.68610 À10 mol dm À3) was obtained with DTPA and for this reason it was selected for the determination of the concentration of chromium in different wine samples, after having conducted a previous optimization of the experimental factors.

Simultaneous voltammetric determination of trace bismuth(III) and cadmium(II) in water samples by adsorptive stripping voltammetry in the presence of cupferron

“…Cupferron is widely used in analytical chemistry forming stable complexes with a lot of metals which willingly adsorb onto the mercury electrode. We can find numerous adsorptive stripping procedures which employ cupferron as a complexing agent for sensitive determinations of many metals, such as aluminum [34,35], chromium [36,37], copper [38], vanadium [39], titanium [40], europium [41], molybdenum and uranium [42][43][44].…”

Anodic Stripping Voltammetry for the Determination of Trace Cr(VI) with Graphite/Styrene-Acrylonitrile Copolymer Composite Electrodes

“…This protocol involves the formation of a surface-active complex of Cr(VI) in the presence of an appropriate chelating agent, followed by its adsorptive accumulation, and reduction by a cathodic scan. 7 Some organic agents, such as diethylenetriamine pentaacetic acid [8][9][10][11][12][13] and triethylenetetraaminehexaacetic acid, 13 have been used as complexing ligand in AdCSV applications. Unfortunately, it is not easy to obtain satisfactory reproducibility and repeatability in Cr(VI) determinations.…”

Determination of oxcarbazepine by Square Wave Adsorptive Stripping Voltammetry in pharmaceutical preparations

“…They are more efficient than the "one-at-a-time" experiments since they permit interactions to be detected between factors that might otherwise lead to false conclusions. Experimental design has successfully been employed in the optimization of experimental variables in electroanalytical techniques [10][11][12][13][14][15]. As a result, in our work, experimental design has been used to establish appropriate experiments that will lead to the optimization of the influencing variables, such as, potential, deposition time (E dep , t dep ) and pH value.…”