COMPUTER-INTERFACED BIPOLAR PULSE CONDUCTIVITY DETECTOR FOR CAPILLARYSYSTEMS

Conductivity detectors sufficiently small for deployment in capillary analytical systems can be fabricated very simply and reproducibly from commonly available micro assemblies of multiconductor ribbons. It res ults in a unique geometry for the conductivity detection cell where th e fluid does not flow between the electrodes. Interface circuitry for a personal computer (PC)-based bipolar pulse conductance detector is d escribed. The cell can be used with this or commercial detectors. Resu lts obtained with the new cell and electronic design in a suppressed c onductometric capillary electrophoresis separation system are presente d.