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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

 

E-mail: cmm@isep.ipp.pt

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.

DOI: 10.2478/s11696-012-0175-x

 

Chemical Papers 66 (10) 891–898 (2012)

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