Application of multivariate curve resolution to the voltammetric data Factor analysis ambiguities in the study of weak consecutive complexation of metal ion with ligand

Different techniques for factor analysis (FA) have been applied in the study of weak consecutive complexes of Cd(II) propanoate by analysing experimental matrices obtained from four electroanalytical techniques: normal pulse polarography (NPP), reverse normal pulse polarography (RNPP), differential pulse polarography (DPP) and differential pulse anodic stripping voltammetry (DPASV). All experiments were performed at a constant temperature, 25 ± 1 °C, in aqueous solutions having a constant cadmium ion concentration (10 and 20 μM), varying propanoate concentrations in the range 10–400 mM, a constant c(propanoic acid)-to-c(sodium propanoate) ratio (1: 50), and a constant ionic strength (2 M), obtained by addition of NaClO4.