Microelectrode arrays with interacting diffusion layers: Special applications

The review deals with special applications of interdigitated array (IDA) mi croelectrodes. A high collection efficiency in comparison with RRDE (rotato ry ring disc electrode) can be used for the determination of species by tit ration in the diffusion layer of an IDA system. The titrant (iodine, bromin e, and hypobromite) is galvanostatically generated on one IDA segment and a nother segment serves as an amperometric detector with constant potential, which corresponds to the opposite reaction to that of titrant electrochemic al generation. The method is simple, sensitive to the species (ammonium, ar senic, thiosulfate. allyl alcohol, iodide) and can also be used in microana lysis.