Analysis of Voltammetric Half-Wave Potentials in Low Ionic Strength Solutions and Voltammetric Measurement of Ion Impurity Concentrations
CORNELL UNIV ITHACA NY BAKER LAB
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An analytic equation is presented that allows the prediction of steady-state voltammetric half-wave potentials as a function of electrolyte concentration in low ionic strength solutions for electrodes of arbitrary geometry and size. The equation is tested for the oxidation of ferrocene and reduction of TCNQ in acetonitrile at 2.4 - 22.1 micron platinum microdisk electrodes for electrolyte tetra-n-butylammonium perchlorate concentrations between 0.1 and 4 x 10 to the - 9th power M, and in acetonitrile solutions containing no intentionally added electrolyte. An analytical method for measuring ion impurity concentration, based on steady-state microelectrode voltammetry, is proposed and used to measure ionic impurities in acetonitrile.
- Physical Chemistry