Determination of Free Metal Ion Concentrations Using Screen-Printed Electrodes and AGNES with the Charge as Response Function

Corinne Parat (1) , D. Aguilar (2) , L. Authier (3) , M. Potin-Gautier (1) , E. Companys (2) , J. Puy (2) , J. Galceran (2)

1 LCABIE - Laboratoire de Chimie Analytique Bio-Inorganique et Environnement
2 Universitat de Lleida
3 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux

AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) has been implemented with screen-printed electrodes (SPE) for the determination of the free concentration of Zn2+, Cd2+ and Pb2+. For SPE, the stripped charge is a suitable response function which does not require the second stage of AGNES to be under diffusion limited conditions. This property can be used in the avoiding of the interference of Pb on [Cd2+] determination. The proportionality factor between stripped charge and concentration of amalgamated metal depends on the volume of mercury and opens the way to a future calibrationless strategy. Zn and Cd complexation with oxalate at various pH-values confirms the suitability of the developed methodology, which compares favourable with the standard one based on the Hanging Mercury Drop Electrode. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Domaines: Chimie

Corinne Parat, D. Aguilar, L. Authier, M. Potin-Gautier, E. Companys, et al.. Determination of Free Metal Ion Concentrations Using Screen-Printed Electrodes and AGNES with the Charge as Response Function. Electroanalysis, 2011, 23 (3), pp.619-627. ⟨10.1002/elan.201000566⟩. ⟨hal-01561639⟩