Journal
ELECTROANALYSIS
Volume 21, Issue 13, Pages 1481-1489Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200804527
Keywords
Nickel hexacyanoferrate; Dopamine; Ascorbic acid; Flow injection analysis; Real samples
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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 x 10(-6) to 1.2 x 10(-3) M without the interference from ascorbic acid (AA). A detection limit of 4.9 x 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.
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