Electrochemical Study of 4-Nitrophenol at a Modified Carbon Paste Electrode |
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Authors: | María del Mar Cordero-Rando Manuel Barea-Zamora Juan M Barberá-Salvador Ignacio Naranjo-Rodríguez Juan A Muñoz-Leyva José L Hidalgo-Hidalgo de Cisneros |
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Institution: | (1) Department of Analytical Chemistry, Faculty of Sciences, University of Cádiz, 11510 Puerto Real, Cádiz, Spain, ES |
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Abstract: | A zeolite-modified carbon paste electrode (CPE) has been used for the determination of 4-nitrophenol by differential pulse
voltammetry (DPV). The electrochemical reduction of 4-nitrophenol at −1.0 V is carried out in a Britton-Robinson medium at
pH 3.5. The cyclic voltammetric (CV) behaviour has been investigated to study the nature of the process. Studies on the effect
of pH were carried out over the pH range 2–9 with the Britton-Robinson buffer solution, and the influence of pH on peak height
and peak potential was analyzed. A linear relationship between peak intensity and concentration is obtained in the range 0.2–10 mg L−1, with a detection limit of 0.04 mg L−1; a relative standard deviation of 1.5% for a 5 mg L−1 4-nitrophenol concentration and a relative error of 2.6% were also obtained (n=11).
Received March 3, 1998. Revision December 10, 1998. |
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Keywords: | : 4-Nitrophenol differential pulse voltammetry zeolite-modified carbon paste electrode |
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