Abstract
A flow cell with a rotating glassy carbon disk electrode has been exploited for voltammetric and amperometric determinations. The high analytical currents due to the efficient mass-transport are coupled with a new hydrodynamic modulation technique that discriminates against the major background currents, resulting in high sensitivity and low detection limits. For a rotated disk electrode immersed in a stream at a constant flow rate, the current difference is measured with the rotation switched on and off. Well defined current—potential curves are obtainable. Mass-transport properties, sensitivity, precision and linearity of response are reported. Modulation rates range from 0.1 to 1 Hz. Cell performance is demonstrated by the anodic oxidations of micromolar concentration levels of ascorbic acid, NADH, and hexacyanoferrate(II).
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