ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Development of polyaniline microarray electrodes for cadmium analysis
Marta Oliveira, Subramanian Viswanathan, Simone Morais, and Cristina Delerue-Matos
Requimte, Instituto Superior de Engenharia do Porto, Rua Dr. António Bernardino de Almeida 431, 4200-072 Porto, Portugal
Abstract: Disposable screen-printed electrodes (SPCE) were modified using a cosmetic product to partially block the electrode surface
in order to obtain a microelectrode array. The microarrays formed were electropolymerized with aniline. Scanning electron
microscopy was used to evaluate the modified and polymerized electrode surface. Electrochemical characteristics of the constructed
sensor for cadmium analysis were evaluated by cyclic and square-wave voltammetry. Optimized stripping procedure in which the
preconcentration of cadmium was achieved by depositing at −1.20 V (vs. Ag/AgCl) resulted in a well defined anodic peak at
approximately −0.7 V at pH 4.6. The achieved limit of detection was 4 × 10−9 mol dm−3. Spray modified and polymerized microarray electrodes were successfully applied to quantify cadmium in fish sample digests.
Keywords: screen-printed electrodes – microarray electrodes – aniline – cadmium
Full paper is available at www.springerlink.com.
Chemical Papers 66 (10) 891–898 (2012)