title: Determination of silver(I) by differential pulse voltammetry using a glassy carbon electrode modified with synthesized N-(2-aminoethyl)-4,4'-bipyridine.
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.
authors.affiliation: Centre of Bioanalysis, National Institute of Research and Development for Biological Sciences, 296, Splaiul Independentei, Bucharest 060031, Romania. cristinariz2002@yahoo.com
authors.forename: Maria-Cristina
authors.initials: MC
authors.lastname: Radulescu
authors.forename: Ana
authors.initials: A
authors.lastname: Chira
authors.forename: Medeea
authors.initials: M
authors.lastname: Radulescu
authors.forename: Bogdan
authors.initials: B
authors.lastname: Bucur
authors.forename: Madalina Petruta
authors.initials: MP
authors.lastname: Bucur
authors.forename: Gabriel Lucian
authors.initials: GL
authors.lastname: Radu
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods / Q000592:standards; D002138:Calibration; D002244:Carbon / Q000737:chemistry* / Q000494:pharmacology; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004784:Environmental Monitoring / Q000379:methods; D019856:Ethanolamine / Q000737:chemistry; D005021:Ethylamines / Q000138:chemical synthesis / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006801:Humans; D017736:Ion-Selective Electrodes; D011725:Pyridines / Q000138:chemical synthesis / Q000737:chemistry; D012834:Silver / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D005021:Ethylamines; D011725:Pyridines; D014874:Water Pollutants, Chemical; D012834:Silver; D019856:Ethanolamine; D002244:Carbon; C034306:4,4'-bipyridyl