Abstract
An electrode which is simple to construct and easy to use for generating stationary mercury drops of reproducible size automically at the end of a capillary tube, without having to obstruct the mercury pathway, is described. With this electrode, the mercury head is of about 1–2 cm so as to counterbalance roughly the back-pressure; moreover, the capillary tube is made sufficiently long and has a sufficiently small inner diameter so that viscous forces prevent mercury from flowing through the capillary when the mercury reservoir and the capillary tip are both subject to atmospheric pressure. The mercury drop is grown by applying a pressure of 4–10 atm to the mercury reservoir and is blocked by applying atmospheric pressure. Operation of the electrode is entirely automatic. An application in current-sampled dc polarography is described.
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