Chitosan Modified Gold Film Microelectrode for the Determination of Iodide

摘要

A simple electrochemical method for iodide detection using colloid Au/chitosan modified gold film microelectrode was developed. The modified electrode was prepared by coating colloid Au/chitosan membrane on the surface of a gold film microelectrode, whose working area could be easily adjusted as required. The detection was carried out in 0.1 mol·L~(-1) KH_2PO_4 (pH=3) solution, and the obtained Anodic Stripping Voltammetry (ASV) current response increased proportionally with iodide concentration in the range of 3.32×10~(-7) mol·L~(-1)～1.57×10-2 mol·L~(-1) with a correlation coefficient of 0.9996. Compared with the commercial iodide selective electrode, it is more sensitive especially at lower concentrations.