Nafion‐Modified Glassy Carbon Electrode for Trace Determination of Indium

A new method for determination of trace indium is proposed by the adsorption stripping voltammetry (ASV) using a Nafion-modified glassy carbon electrode (NMGCE). This chemically modified electrode (CME) shows a better stability. A sensitive oxidation peak was observed, and the anodic peak potential is ca. -0.548 V (vs. SCE). The influences of various experimental parameters on the current peak were completely studied. Under the optimized condition, the method has been applied to the determination of indium in water samples. There is a good linear relationship between the peak current (i(p)) and indium(III) concentration in the range of 1.0x10(-9) -1.0x10(-7) mol/l, and the limit of detection is 7.5x10(-10) mol/l.