AbstractPerchlorate and tetrafluoroborate ion‐selective carbon paste electrodes based on different moditied pasting liquids were prepared and their basic characteristics were tested in direct potentiometric measurements. Although the slopes of calibration plots, detection limits as well as selectivity coefficients were similar to those obtained with commercial liquid/plastic membrane type ion‐selective electrodes, the carbon pastes offered some advantages as more rapid response and very low ohmic resistance. The resulting electrodes were successfully applied in ion‐pair formation‐based potentiometric titrations of perchlorate, fluororate and iodide ions with cetylpyridinium c
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