By Kamala Zutshi
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Extra resources for Introduction to Polarography and Allied Techniques
This is in contrast to other electrodes. 4. Only small quantities of substances are deposited in the vicinity of the dropping electrode during electrolysis. For the reason there is no depletion of the depolarizer in the solution provided the volume of the electrolyzed solution is not too small. The curves obtained are identical even after several runs. 5. 005 ml) may be studied. The Electrodes 15 6. 0 V (mix of dioxan and water) against the (NCE) normal calomel electrode. 0 V) decomposition of water or of the given solvent takes place.
2. It is composed of a thick walled glass tubing with an internal diameter of 4 mm, approximately 5 cm long. This forms a mercury reservoir which is sealed to a thick wall capillary. 18 mm, but may vary somewhat around this value. The length of the capillary will depend on the size of the electrolytic cell. A groundglass joint on the mercury reservoir can provide a convenient means of supporting electrode in a cell. A Teflon thermometer adapter also works well. The top of the reservoir resembles a glass ring which is flat and very smoothly polished.
Solid metal and carbon electrodes are useful in such cases. 4 V vs SCE in solutions of perchlorates or nitrates since these anions do not form insoluble salts or stable complexes with mercury cations. 4 V vs SCE. 3 V, and so on. A number of mercury electrodes have been widely used for voltammetry. Of these, the dropping mercury electrode (DME) has been extensively used both for analytical and fundamental studies. Others are hanging mercury drop electrode (HDME), streaming mercury electrode (SME), and mercury film electrode (MFE) so also the static mercury drop electrode (IMDE) which is recently developed.
Introduction to Polarography and Allied Techniques by Kamala Zutshi