Iodide Modified Silver Electrode and Its Application to the Electroanalysis of Hemoglobin

Iodide can form a complex with silver metal, and thus be used to modify a silver electrode surface. This modified electrode is not only stable due to the chemical reaction between the modifier and the substrate, but also able to facilitate the electrochemical redox reaction with hemoglobin. Differential pulse voltammetric (DPV) measurements of the protein with the modified electrode show a linear relationship between the anodic peak current and the protein concentration in the range of 5×10–7–5×10–6 mol/L. The detection limit is 3×10–7 mol/L. The relative standard deviation is 4.5% for 6 successive determinations of a 5×10–6 mol/L protein solution.