Browsing by Author "Abebe, Ananiya"

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    An Electrochemical Sensor for the Oxidative Determination of 4-Nitro Phenol at Poly (Bromo Cresolpurple) Modified Glassy Carbon Electrode
    (Addis Ababa University, 2020-02-06) Abebe, Ananiya; Negash, Negussie (PhD)
    A glassy carbon electrode was modified with bromocresol purple (BCP) and characterized for the electrochemical oxidation of 4-nitrophenol (4-NP) by cyclic voltammetry and differential pulse voltammetry. The oxidation peak current of 4-NP at the modified electrode was increased (compared to the bare GCE), thus indicating that the BCP exhibits a remarkable enhancement effect on the electrochemical oxidation of 4-NP. The effects of loading with BCP, pH value and scan rate were examined. The oxidation peak current of 4-NP is proportional to its concentration in the range of 4.0 μM to 100 μM, with a correlation coefficient of 0.984. The detection limit is 2.8 μM. The method is simple, selective and sensitive. It was successfully applied for the determination of 4-NP in water samples, with recoveries ranging from 100% to 101%.