Browsing by Author "Aniyo Natnael"

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    Voltammetric Study of Fenitrothion by Using Poly (Carmine) Modified Glassy Carbon Electrode
    (Addis Ababa Universty, 2008-06) Aniyo Natnael; Admassie Shimelis (PhD)
    Attempted has been made to develop a voltammetric sensor for the determination of fenitrothion based on the use of poly (carmine) film electrode. The voltammetric response of poly (carmine) based on previously reported paper is compared with voltammetric response of electrochemically pretreated (EPT) glassy carbon electrode in 0.5M H2SO4 and 0.1M (pH 6.0) phosphate buffer used for the preparation of carmine. The response appears to be similar in both poly (carmine) modified and EPT glassy carbon electrodes. Electrochemical behavior of fenitrothion is studied by cyclic voltammetry (CV). One irreversible reductive peak appeared at -0.598 V and a couple of reversible oxidative and reductive peaks appeared at -0.012 V and -0.04 V potentials respectively. The oxidation peak of fenitrothion is studied by linear scan voltammetry (LSV) and it exhibited a well defined peak at a potential of -0.012 V on both poly (carmine) modified and EPT glassy carbon electrodes. Compared with that on a bare glassy carbon electrode, the oxidation peak current of fenitrothion at the modified electrodes is significantly enhanced. The oxidation peak current is linear with the fenitrothion concentration in the range of 5.0 x 10-6 to 1.2 x 10-4 mol L-1 for the poly (carmine) modified glassy carbon electrode and 5.0 x 10-6 to 1.0 x 10-4 mol L-1 for the EPT glassy carbon electrode.