Determination of Dopamine in presence of Ascorbic Acid at Eriochrome Black T Modified Carbon Paste Electrode : A Voltammetric Study

作者：Chandra Umesh^*; Swamy B E Kumara; Gilbert Ongera; Sherigara B S

来源：International Journal of Electrochemical Science, 2010, 5(10): 1475-1483.

• Eriochrome black T
• dopamine
• ascorbic acid
• electrocatalytic oxidation
• modified carbon paste electrode

In this investigation the modification of carbon paste electrode was done by adding Eriochrome Black T (EBT) to the mixture of dry graphite powder and silicon oil of ratio 70: 30 percent respectively. The voltammetry of EBT modified carbon paste electrode (EBTMCPE) was investigated with standard potassium ferricyanide solution shows reversible voltammogram. The electrochemical study shows catalytic oxidation of dopamine (DA) was better sensitive at EBTMCPE in 1M KCl solution as supporting electrolyte. The effect of concentration and scan rate were studied. The electrode process was found to be diffusion-controlled. The EBTMCPE shows selective enhancement of oxidation peak current for DA in the presence of ascorbic acid (AA). DA was also detected by using differential pulse voltammetry (DPV). In the presence of AA, DA-AA shows peak potential separation of 163mV. The concentration effect of both AA and DA were studied by using DPV.

• 出版日期2010-10