Excellent discharge stability is achieved by using the “electrolyte wire” in an insulator capillary as a well defined central current route to the cathode layer of the discharge. This new cell has a volume of 15 µl and requires only 3.5 ml min −1 flow. In contrast to the earlier ELCAD cells having large electrolyte pool cathode of 2–3 cm diameter and 10 ml min −1 flow rate, the novel cathode flow system consists of a glass capillary of 1 mm id. The sample that is fed into the cell is analyzed through cathode-sputtering of the electrolyte surface at the end of the capillary. A capillary version of the atmospheric electrolyte cathode glow discharge (ELCAD) cell is described which could act as a multimetal detector for chromatographic or flow injection analysis applications.
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