Voltammetric determination of trace mercury at a sonogel–carbon electrode modified with poly-3-methylthiophene

• Published in: Talanta (Oxford) Vol. 68; no. 1; pp. 79 - 85
• Main Authors: Zejli, Hanane, Sharrock, Patrick, Hidalgo-Hidalgo de Cisneros, J.L., Naranjo-Rodriguez, I., Temsamani, Khalid R.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.11.2005; Oxford Elsevier
• Subjects: Analytical chemistry; Chemistry; Conducting polymer; Electrochemical methods; Exact sciences and technology; General, instrumentation; Mercury(II); Modified electrode; Poly-3-methylthiophene; Sonogel–carbon electrode; Sonogel–carbon electrode; Mercury(II); Conducting polymer; Modified electrode; Poly-3-methylthiophene; Trace analysis; Sonogel-carbon electrode; Mercury II; Carbon electrode; Polymer; Voltammetry; Selectivity; Chemical sensor; Electrochemical polymerization; Electrochemical detector; Sensitivity; Sol gel process; Detection limit
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2005.04.060

The sonogel–carbon electrode is a new class of sol–gel electrode that exhibit favourable mechanics and electrics properties to be used as electrochemical sensor. In this paper, a modified sonogel–carbon electrode is proposed to determine mercury at trace levels. The modified electrode is obtained by electropolymerization of 3-methylthiophene on the surface of a bare sonogel–carbon electrode. This electrode shows high selectivity and sensitivity and linear response towards Hg(II), with a detection limit of 1.4 × 10 −3 mg l −1. The electrode is reusable by a simple chemical cleaning procedure. No deterioration was observed in the electrode response during at least 1 week of successive measurements.