Simultaneous Determination of Cr(III) and Cr(VI) by Differential Pulse Voltammetry Using Modified Screen-Printed Carbon Electrodes in Array Mode

• Published in: Electroanalysis (New York, N.Y.) Vol. 22; no. 24; pp. 2924 - 2930
• Main Authors: Calvo-Pérez, Ana, Domínguez-Renedo, Olga, Alonso-Lomillo, M. Asunción, Arcos-Martínez, M. Julia
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.12.2010; WILEY‐VCH Verlag
• Subjects: Arrays; Carbon; Chromium; Chromium speciation; Differential pulse voltammetry; Electrodes; Gold nanoparticles; Manufacturing engineering; Mercury film; Nanoparticles; Screen-printed electrodes; Speciation; Statistical process control; Voltammetry
• ISSN: 1040-0397; 1521-4109; 1521-4109
• DOI: 10.1002/elan.201000350

A new procedure for the speciation of chromium by means of differential pulse voltammetry using screen‐printed carbon electrodes (SPCEs) has been proposed. Two different modified carbon working, a Ag/AgCl reference and a carbon counter screen‐printed electrodes have been connected in array mode for the simultaneous determination of Cr(III) and Cr(VI). Mercury films or gold nanoparticles have been ground onto the SPCEs in order to improve their selectivity to each chromium species. The quantification of the peak currents observed at −1.25 V in Hg‐SPCE and −0.1 V in AuNPs‐SPCE were carried out. The method has been applied to the speciation of chromium in waste water from a tannery factory.