Browsing by Author "Abicho Samuel"

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    Electrochemical Detection of Fenitrothion Using Poly-(4-amino-3- hydroxynaphthalene-1-sulfonic acid) Modified Glassy Carbon Electrode
    (Addis Ababa Universty, 2009-06) Abicho Samuel; Admassie Shimelis (PhD)
    A glassy carbon electrode (GCE) was modified with electropolymerized film of 4-amino-3- hydroxynaphthalene-1-sulfonic acid (AHNSA) in pH 5.0 acetate buffer solution (ABS). Cyclic voltammetry and square voltammetry were used as the analytical technique to compare the sensitivity of the modified glassy carbon electrode with bare glassy carbon electrode. Fenitrothion detection for different concentrations was performed by square wave voltammetry in pH 5.0 acetae buffer solution (ABS). The irreversible reduction peak current which is at -594 mV is linear with the fenitrothion concentration in the range of 4.0 x 10-6 – 2.0 x 10-5 M, and the detection limit is 8.0 x 10 -8 M. As a result, the square wave voltammetry at modified glassy carbon electrode provides a better sensitivity and it is faster and less expensive than traditional ones, such as, high performance liquid chromatography or gas chromatography, which is time consuming, expensive and can not be carried out in field 34-36. Keywords: Electropolymerization; Cyclic voltammetry; Fenitrothion; Square wave voltammetry; Organophosphorus pesticides (OPPs); 4-Amino-3-hydroxynaphtalene-1-sulfonic acid