An Electrochemical Sensor For The Oxidative Determination Of 4-nitro Phenol At Poly (bromo Cresolpurple) Modified Glassy Carbon Electrode

A glassy carbon electrode was modified with bromocresol purple (BCP) and characterized forrnthe electrochemical oxidation of 4-nitrophenol (4-NP) by cyclic voltammetry and differentialrnpulse voltammetry. The oxidation peak current of 4-NP at the modified electrode was increasedrn(compared to the bare GCE), thus indicating that the BCP exhibits a remarkable enhancementrneffect on the electrochemical oxidation of 4-NP. The effects of loading with BCP, pH value andrnscan rate were examined. The oxidation peak current of 4-NP is proportional to itsrnconcentration in the range of 4.0 μM to 100 μM, with a correlation coefficient of 0.984. Therndetection limit is 2.8 μM. The method is simple, selective and sensitive. It was successfullyrnapplied for the determination of 4-NP in water samples, with recoveries ranging from 100% torn101%.

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