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Catalytic Oxidation of Dopamine at a Nickel Hexacyanoferrate Surface Modified Graphite Wax Composite Electrode Coated with Nafion
Author(s) -
Prabakar S. J. Richard,
Narayanan S. Sriman
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200804527
Subject(s) - electrode , ascorbic acid , nafion , cyclic voltammetry , graphite , detection limit , materials science , dielectric spectroscopy , chemically modified electrode , nickel , inorganic chemistry , electrochemistry , working electrode , chemical engineering , chemistry , chromatography , composite material , metallurgy , food science , engineering
A chemically modified electrode was successfully fabricated by means of depositing a thin layer of nickel hexacyanoferrate (NiHCF) on an amine adsorbed graphite paraffin wax composite electrode using a new approach. The electrode was further coated with Nafion. The electrochemical characteristics of the modified electrode were studied using cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The modified electrode catalyzed dopamine (DA) oxidation in the concentration range of 1.5×10 −6 to 1.2×10 −3 M without the interference from ascorbic acid (AA). A detection limit of 4.9×10 −7 M was obtained for DA in the presence of AA with a correlation coefficient of 0.9972 based on S / N =3. Flow injection analysis was used for the determination of dopamine with excellent reproducible results. The analytical utility of the sensor was evaluated for detection of DA in urine.