Comparison of the influence and contribution of the response times of coated open-tubular solid-state bromide- and chloride-selective electrodes on the analytical throughput (dispersion) in flow injection systems

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Abstract
An evaluation of the influence and contribution of the response times of coated open-tubular solid-state bromide- and chloride-selective electrodes on the analytical throughput (dispersion) in flow injection (FI) systems is presented using concentration ranges of 10–5000 mg dm–3 for bromide and chloride, respectively, in the study. For both electrodes the adsorption rate is independent of concentration and does not contribute significantly to any decrease in the sampling rate, although the adsorption rate of the chloride-selective electrode in the FI system seems to be slightly faster than the bromide system. For both electrodes the desorption mechanism process is mainly responsible for the sampling rate obtained in an optimized Fl–ion-selective electrode system. An electrode memory of the bromide-selective electrode is the main reason for the sampling rate of this system being lower than that obtained for a similar Fl system with a chloride-selective electrode.

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