Adsorptive stripping determination of indole-3-acetic acid at a carbon fiber ultramicroelectrode

A method is described for the determination of minute amounts of indole-3-acetic acid (IAA) in plant extracts. The method is based on adsorptive stripping voltammetry at a carbon fiber ultra microelectrode. Optimal conditions with respect to accumulation time and potential, scan rate and pH are established. The relative error was 1.6% and the relative standard deviation was 1.5% for IAA concentrations at the 1.0 μg ml−1 level.