Second-order data obtained from differential pulse voltammetry: Determination of lead in river water using multivariate curve resolution-alternating least-squares (MCR-ALS)

Abstract

Multivariate curve resolution by alternating least squares (MCR-ALS) with the aim of achieving the electrochemical second order advantage has been applied to potential-time second-order data. In this work a simple way is reported as a first approach towards generation of the instrumental electrochemical second-order data by differential pulse voltammetry (DPV). A linear dependency exists in the pulse duration profiles of the electroactive species in the mixture samples. Rank deficiency of the mixture data matrix is broken by matrix augmentation. Due to existence of potential shift in the obtained data, MCR-ALS could not be achieved the convergence on the augmented data. So this shift was corrected with potential shift correction algorithm. Results of MCR-ALS after shift correction show that the proposed method could be efficiently used for determination of Pb2+ in the presence of unexpected interferents in the river water sample. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.