Static mercury drop electrode (SMDE) is useful in the trace analysis of toxic metals in drinking water. It is used in the field of organic analysis for elemental and functional group analysis, in electrochemistry yields information about the rate of the electrode process, adsorption-desorption phenomena, and fast chemical reactions accompanying the electron transfer. It is useful in analysis of biological systems, analysis of drugs and pharmaceutical preparations, determination of pesticide or herbicide residues in foods, for environmental analysis and especially for marine study for characterization of organic matter and metals interactions.
Static mercury drop electrode (SMDE), a tri-mode electrode, is able to function as either a DME (dropping mercury electrode) or HMDE (hanging mercury drop electrode). A solenoid-actuated valve interposed in the mercury path between the reservoir and the capillary controls each drop. Measurements are always performed on static drops, even in DME operation where new drops are formed at the clock time interval. By making the measurements on static drops, the dc double layer charging current due to the growing drop (traditionally measurement process) is eliminated and higher sensitivities are readily achieved.