Journal
SENSORS
Volume 10, Issue 12, Pages 11340-11351Publisher
MDPI AG
DOI: 10.3390/s101211340
Keywords
differential pulse voltammetry; diazonium salt; modified glassy carbon electrode; silver; N-(2-aminoethyl)-4,4 '-bipyridine
Funding
- Romanian Ministry of Education and Research [BLUEBOXSENS 82102/2008, PN II-RU TE-100/2010]
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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 mu M to 1 mu M Ag(I) with a detection limit of 0.025 mu M and RSD = 3.6%, for 0.4 mu M 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.
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