The electrochemical behavior of an interdigitated array (IDA) microelectrode in flow systems was investigated. The current densities at the IDA electrodes are much higher than those of a conventional disk electrode, resulting in a higher signal-to-noise ratio. The amperometric, quasi-amperometric and coulometric responses at an IDA electrode in flow system were compared with theoretical predictions. The flow rate dependence of redox cycling in the dual mode is constant in the amperometric region and depends only on the IDA dimensions. In the quasi-amperometric region, the flow rate dependence of redox cycling varies with coulometric yield. Redox cycling is inversely proportional to the 2/3 power of the volume flow rate in the coulometric region. The flow rate dependence of the amperometric detector response in LC was also examined.
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