AMPEROMETRIC ARRAYS IN FLOWING SOLUTION ANALYSIS

The design and evaluation of flow-cell geometries for application to s olution analysis utilizing an array of independently controlled electr odes in conjunction with amperometry is discussed. The optimization an d performance testing of a circular array of glassy carbon disc electr odes in a wall-jet arrangement is presented. The array is shown to beh ave as planar electrodes or thin-layer electrodes depending upon wheth er or not the hydrodynamic boundary layer is unrestricted or restricte d. A novel array of platinum-on-copper electrodes, arranged in a plana r spiral, is used to demonstrate anomalous behaviour due to reflection effects at the outer extremes of the flow-cell volume. The difficulty in maintaining potentiostatic control of a linear array of glassy car bon disc electrodes in a thin-layer slot design is discussed in terms of ohmic drop.