APPLICATION OF AN OPTIMIZATION PROCEDURE IN ADSORPTIVE STRIPPING VOLTAMMETRY TO THE DETERMINATION OF NICKEL WITH DMG

A procedure for the determination of nickel by adsorptive stripping vo ltammetry (AdSV), using dimethylglyoxime as complexing agent, has been optimized. The determination was carried out by two different techniq ues: differential pulse adsorptive stripping voltammetry (DPAdSV) and square wave adsorptive stripping voltammetry (SWAdSV). The selection o f the experimental parameters was done using a factorial design which allows one to find the most significant variables, i.e., those which e xert the greatest influence on the measured magnitude, with a reduced number of experiments. Posterior optimization of these variables provi ded the most adequate experimental conditions and it was under these c onditions that the calibrations were made, using a robust regression m ethod which allows the elimination of anomalous points.