Hanging mercury drop electrode

Hanging mercury drop electrode

The hanging mercury drop electrode (HMDE) is a working electrode variation on the dropping mercury electrode (DME). Sometimes called the "static mercury drop electrode". [Bard, A.J.; Faulkner, L.R. Electrochemical Methods: Fundamentals and Applications. New York: John Wiley & Sons, 2nd Edition, 2000.]

Distinction

The hanging mercury drop electrode (HDME) produces a partial mercury drop of controlled geometry and surface area at the end of a capillary in contrast to the dropping mercury electrode (DME) which steadily releases drops of mercury during an experiments. The disadvantages a DME experiences due to a constantly changing surface are not experience by the HMDE since its static surface area during an experiment. The static surface or the HDME means it is more likely to suffer from surface absorption phenomenon than a DME. Unlike solid electrodes which need to be cleaned and polished between most experiments the self-renewing HMDE can simple release the contaminated drop and grow a clean drop between each experiment.

ee also

* working electrode
* voltammetry
* polarography
* dropping mercury electrode

References


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