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Arsenic detection by nanogold/conducting‐polymer‐modified glassy carbon electrodes
Author(s) -
Chowdhury AlNakib,
Ferdousi Sara,
Islam Md. Mominul,
Okajima Takeyoshi,
Ohsaka Takeo
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25785
Subject(s) - polyaniline , glassy carbon , arsenic , cyclic voltammetry , materials science , anodic stripping voltammetry , detection limit , electrode , stripping (fiber) , conductive polymer , electrochemistry , chemical engineering , inorganic chemistry , polymer , analytical chemistry (journal) , chemistry , composite material , organic chemistry , chromatography , polymerization , metallurgy , engineering
This article discusses the results for the development of a nanogold‐particle/polyaniline‐modified glassy carbon electrode for the detection of arsenic(III) in water. A thin polyaniline film was electropolymerized onto a glassy carbon electrode. The gold nanoparticle was then deposited onto the polyaniline‐coated glassy carbon electrode via potential step electrolysis from 1.1 to 0 V versus Ag/AgCl/NaCl (saturated) for 45 s from a 0.5 M H 2 SO 4 solution containing 0.1 m M NaAuCl 4 in the absence and presence of a 0.1 m M KI additive. The surface of the modified electrode was examined with scanning electron microscopy. Cyclic and anodic stripping voltammetry of arsenic(III) was performed on the modified electrode. The thus modified nanogold‐particle/polyaniline‐modified glassy carbon electrode prepared in the presence of the I − (KI) additive showed a high sensitivity in detecting arsenic(III) in water, and with stripping voltammetry, a limit of detection of 0.4 ppb arsenic was obtained, which is much lower than the arsenic guideline limit of the World Health Organization. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1306–1311, 2007