Voltammetric Study of Fenitrothion by Using Poly (Carmine) Modified Glassy Carbon Electrode
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Date
2008-06
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Addis Ababa Universty
Abstract
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.
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Keywords
Glassy Carbon Electrode