Negash, Negussie (PhD)Abebe, Ananiya2021-03-302023-11-092021-03-302023-11-092020-02-06http://etd.aau.edu.et/handle/12345678/25815A 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%.en4-NitrophenolPolybromocresol Purple (Bcp)OxidationCyclic Voltammetry (Cv)Differential Pulse Voltammetry (Dpv)Modified ElectrodeElectropolymerizationThesis