Application of a Carbon Nanotube Modified Electrode in Anodic Stripping Voltammetry for Determination of Trace Amounts of 6-Benzylaminopurine

Abstract.

Carbon nanotubes were modified on the surface of a glassy carbon electrode (GC) and initially applied in semi-derivative anode stripping voltammetry for the determination of 6-benzylaminopurine. The experiments demonstrated that the presence of the carbon nanotube greatly increased the current of the oxidation peak of benzylaminopurine. Cyclic voltammetry (CV) and semi-derivative voltammetry were used in a comparative investigation into the electrochemical oxidation of benzylaminopurine with the modified electrode. Studies on the effect of pH on the peak current and potential were carried out over the pH range of 9.0 ∼ 13.0 with the NH₃–NH₄Cl buffer solution. A pH of 10.0 was chosen as the optimum pH. Other experimental parameters, such as film thickness, accumulation potential, temperature etc. were optimized. The anodic peak current was found to be linearly related to the concentration of benzylaminopurine over the range of 4.0×10⁻⁸ to 1.0×10⁻⁵ mol·L⁻¹ with a detection limit of 5.0×10⁻⁹ mol·L⁻¹ in an accumulation time of 5 min. Interferences of some inorganic and organic species on the response have been studied.