Application of multivariate curve resolution to the voltammetric study of the complexation of fulvic acids with cadmium(II) ion Original Research Article

The interaction of fulvic acids with Cd(II) ions has been studied by differential pulse anodic stripping voltammetry (ASV), at pH 7.0 and 0.1 M KNO3. Voltammetric data obtained during the titration of mixtures of Cd(II) and fulvic acids at different concentrations have been analyzed using multivariate curve resolution (MCR). The application of this method allowed the resolution of the major contributions involved in the titration experiments. Apart from free Cd(II), two more contributions related with the complexation process were detected and resolved, and their corresponding pure voltammograms and concentration profiles were estimated. Simultaneous analysis of independent voltammetric titrations using the proposed MCR methods is shown extremely recommended because it overcame some of the limitations observed in the analysis of individual titrations.