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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

1,* , 1,2
,
3
,
1
,
1
 and
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 / Revised: 1 December 2010 / Accepted: 2 December 2010 / Published: 13 December 2010
(This article belongs to the Section Physical Sensors)
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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 differential pulse voltammetry; diazonium salt; modified glassy carbon electrode; silver; N-(2-aminoethyl)-4,4'-bipyridine
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Radulescu, M.-C.; Chira, A.; Radulescu, M.; Bucur, B.; Bucur, M.P.; Radu, G.L. Determination of Silver(I) by Differential Pulse Voltammetry Using a Glassy Carbon Electrode Modified with Synthesized N-(2-Aminoethyl)-4,4'-Bipyridine. Sensors 2010, 10, 11340-11351.

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