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• Radulescu, M
• Chira, A
• Radulescu, M
• Bucur, B
• Bucur, M
• Radu, G
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• Radulescu, M
• Chira, A
• Radulescu, M
• Bucur, B
• Bucur, M
• Radu, G
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• Radulescu, M
• Chira, A
• Radulescu, M
• Bucur, B
• Bucur, M
• Radu, G

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Sensors 2010, 10(12), 11340-11351; doi:10.3390/s101211340

Article

Determination of Silver(I) by Differential Pulse Voltammetry Using a Glassy Carbon Electrode Modified with Synthesized N-(2-Aminoethyl)-4,4'-Bipyridine

Maria-Cristina Radulescu ^1,* , Ana Chira ^1,2 , Medeea Radulescu ³ , Bogdan Bucur ¹ , Madalina Petruta Bucur ¹  and Gabriel Lucian Radu ²

¹ Centre of Bioanalysis, National Institute of Research and Development for Biological Sciences, 296, Splaiul Independentei, Bucharest 060031, Romania ² Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 1-7, Polizu, Bucharest 011061, Romania ³ Faculty of Chemistry, Department of Analytical Chemistry, University of Bucharest, Sos. Panduri No. 90, Sect. 5, Bucharest 050663, Romania

* Author to whom correspondence should be addressed.

Received: 12 November 2010; in revised form: 1 December 2010 / Accepted: 2 December 2010 / Published: 13 December 2010

(This article belongs to the Section Chemical Sensors)

Download PDF Full-Text [297 KB, uploaded 13 December 2010 14:14 CET]

Abstract: A new modified glassy carbon electrode (GCE) based on a synthesized N-(2-aminoethyl)-4,4'-bipyridine (ABP) was developed for the determination of Ag(I) by differential pulse voltammetry (DPV). ABP was covalently immobilized on GC electrodes surface using 4-nitrobenzendiazonium (4-NBD) and glutaraldehyde (GA). The Ag(I) ions were preconcentrated by chemical interaction with bipyridine under a negative potential (−0.6 V); then the reduced ions were oxidized by differential pulse voltammetry and a peak was observed at 0.34 V. The calibration curve was linear in the concentration range from 0.05 μM to 1 μM Ag(I) with a detection limit of 0.025 μM and RSD = 3.6%, for 0.4 μM Ag(I). The presence of several common ions in more than 125-fold excess had no effect on the determination of Ag(I). The developed sensor was applied to the determination of Ag(I) in water samples using a standard addition method.

Keywords: differential pulse voltammetry; diazonium salt; modified glassy carbon electrode; silver; N-(2-aminoethyl)-4,4'-bipyridine

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