POTENTIOMETRY WITH PERCHLORATE AND FLUOROBORATE ION-SELECTIVE CARBON-PASTE ELECTRODES

Perchlorate and tetrafluoroborate ion-selective carbon paste electrode s based on different modified pasting liquids were prepared and their basic characteristics were tested in direct potentiometric measurement s. Although the slopes of calibration plots, detection limits as well as selectivity coefficients were similar to those obtained with commer cial liquid/plastic membrane type ion-selective electrodes, the carbon pastes offered some advantages as more rapid response and very low oh mic resistance. The resulting electrodes were successfully applied in ion-pair formation-based potentiometric titrations of perchlorate, flu oroborate and iodide ions with cetylpyridinium chloride.