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questions :Wright short note an dropping mmercury electrode
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[Visitor (180.171.*.*)]answers [Chinese ]Time :2021-03-29
The drop mercury electrode is a special electrode commonly used in polar spectrometration. It is mercury from the outer diameter of 3 to 7mm, the internal diameter of 0.04 to 0.08mm of vertical glass capillary flow out, and the formation of mercury droplets and drop electrodes (each mercury drop constantly from small to large, when large to a diameter of about 0.5 to 1.0mm, due to gravity and drop). The height of the mercury bottle can be adjusted or mechanical (knocker) can be used to control the drop time of the mercury drop.
The drop mercury electrode, as an indicative electrode of the polar spectrometry method, is commonly used as a cathode and is a polarized electrode that produces thick differential polarization on its surface during electrolyte. The advantages are that the electrode surface is constantly updated and reproducible, many metals can be aligned with mercury to produce mercury, their ions are reversible to reduce on the mercury electrode, mercury is easy to purify, and hydrogen has a higher super-potential on mercury, making it possible for polar spectrometry to be performed in a micro-acid solution. The main disadvantages are: the use of the range of the maye should not be greater than 0.4V, mercury to oxidize;
A glass capillary with an internal diameter of about 50 to 80 m is connected to the mercury storage bottle, adjusting the height of the bottle so that the mercury in the capillary continuously drips at the end of the capillary at mercury pressure, which is a drop mercury electrode. There is interface stress in both interfaces, and the electrode/solution interface is no exception. But for electrode systems, interface stress is not only related to the composition of the material in the interface layer, but also to the electrode level. This phenomenon of interface stress changing with the electrode level is called electro capillary phenomenon. The relationship curve between interface stress and electrode capacitance is called the electro capillary curve.
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