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A capacitively coupled conductivity detector for electroseparations

A conductivity detector providing high-voltage isolation for electroseparations is described. It is based on an oscillator which is capacitively coupled to the measurement electrodes; the conductance between the electrodes determines the output frequency. The detector was evaluated using a small-volume (500 nl) conductivity cell (cell constant 5.1 × 103 m-1 ) which is described. It was then characterized using a factorial method and optimized to maximize the sensitivity (absolute change in frequency) to changes in conductivity. A novel method was used to determine the cell constant for a pair of microband electrodes (100 µm across on 200 µm centres) with electrolyte confined in a fine channel above them - this was 2615±86 m-1 and the detector has been used with this cell for isotachophoretic separations reported elsewhere.