Determination of fenitrothion in water using a voltammetric sensor based on a polymer-modified glassy carbon electrode

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[1] Amare, Meareg
[2] Abicho, Samuel
[3] Admassie, Shimelis
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Amare, M. (maerega@yahoo.com) | 1600年 / AOAC International卷 / 97期
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A glassy carbon electrode (GCE) modified with poly(4-amino-3- hydroxynaphthalene sulfonic acid) (poly-AHNSA) was used for the selective and sensitive determination of fenitrothion (FT) organophosphorus pesticide in water. The electrochemical behavior of FT at the bare GCE and the poly-AHNSA/GCE were compared using cyclic voltammetry. Enhanced peak current response and shift to a lower potential at the polymer-modified electrode indicated the electrocatalytic activity of the polymer film towards FT. Under optimized solution and method parameters; the adsorptive stripping square wave voltammetric reductive peak current of FT was linear to FT concentration in the range of 0.001 to 6.6 × 10-6 M; and the LOD obtained (3δ/m) was 7.95 × 10-10 M. Recoveries in the range 96-98% of spiked FT in tap water and reproducible results with RSD of 2.6% (n = 5) were obtained; indicating the potential applicability of the method for the determination of trace levels of FT in environmental samples. © 2014 Publishing Technology;
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