Voltammetric Study Of Fenitrothion By Using Poly (carmine) Modified Glassy Carbon Electrode

Attempted has been made to develop a voltammetric sensor for the determination ofrnfenitrothion based on the use of poly (carmine) film electrode. The voltammetricrnresponse of poly (carmine) based on previously reported paper is compared withrnvoltammetric response of electrochemically pretreated (EPT) glassy carbon electrodernin 0.5M H2SO4 and 0.1M (pH 6.0) phosphate buffer used for the preparation ofrncarmine. The response appears to be similar in both poly (carmine) modified and EPTrnglassy carbon electrodes. Electrochemical behavior of fenitrothion is studied by cyclicrnvoltammetry (CV). One irreversible reductive peak appeared at -0.598 V and a couplernof reversible oxidative and reductive peaks appeared at -0.012 V and -0.04 Vrnpotentials respectively. The oxidation peak of fenitrothion is studied by linear scanrnvoltammetry (LSV) and it exhibited a well defined peak at a potential of -0.012 V onrnboth poly (carmine) modified and EPT glassy carbon electrodes. Compared with thatrnon a bare glassy carbon electrode, the oxidation peak current of fenitrothion at thernmodified electrodes is significantly enhanced. The oxidation peak current is linearrnwith the fenitrothion concentration in the range of 5.0 x 10-6 to 1.2 x 10-4 mol L-1 forrnthe 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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