Development of Electrochemical Sensor Based on Polybromocresol Purple for the Determination of O-Aminophenol
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Date
2020-02-02
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Addis Ababa University
Abstract
The aim of this work was to study the effect of conducting properties of polybromocresol purple
(PBCP) in the determination of o-aminophenol. Cyclic Voltammetry (CV) and Differential pulse
Voltammetry (DPV) are employed in this study. The electrochemical oxidation of ortho-amino
phenol was carried out using a PBCP/GC electrode in aqueous acid medium. A glassy carbon
electrode is modified with polybromocresol purple (PBCP) over potential range of -1.5 V - 1.6
V. O-aminophenol was studied by using cyclic voltammetry at different scan rates in the
potential range of -0.1 V to 0.7 V. The results indicated that the oxidation reaction of the oaminophenol
at the modified glassy carbon electrode is irreversible and controlled by diffusion.
Under the optimum conditions, the differential pulse voltammetric current of the sensor was
linear in the concentration range of 1-100 μM with a detection limit of 0.21 μM. The modified
electrode was capable to quantify o-aminophenol in the presence of common interferences and of
detection in the tap water.
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Keywords
O-Aminophenol, Poly Bromocresol Purple (Pbcps), Electropolymerization, Cyclic Voltammetry, Differential Pulse Voltammetry