A multi,wall carbon nanotubes (MWNTs)Nation film,coated glassy carbon electrode (GCE) was fabricated and the electrochemical behavior of ofloxacin on the MWNTs,Nafion film,coated GCE were investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). The oxidation peak current of ofloxacin increased significantly on the MWNTs,Nation film modified GCE compared with that using a bare GCE. This nano,struc,tured film electrode exhibited excellent enhancement effects on the electrochemical oxidation of ofloxacin. A well,defined oxidation peak attributed to ofloxacin was observed at 0.97 V and was applied to the determination of ofloxacin. The oxidation peak current was proportional to ofloxacin concentration in the ranges 1.0×10,8 to 1.0×10,6 mol/L and 1.0×10,6 to 2.0×10,5 mol/L. A detection limit of 8.0×10,9 mol/L was obtained for 400 s accumulation at open circuit (S/N=3). This method for the detection of ofloxacin in human urine was satisfactory.
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