PREPARATION OF A MERCURY DISK MICROELECTRODE BASED ON SOLID SILVER AMALGAM

A smooth mercury microelectrode of disk shape and of prolonged lifetime can be easily obtained by deposition of an appropriate amount of Hg on a solid silver amalgam microdisk. The solid silver amalgam disk can be prepared by depositing, successively, small amounts of mercury on a silver microdisk. The excess of the solid amalgam formed, which is exposed over the insulation plane, must be removed, so that the measured steady-state currents can be described by the appropriate equation for microdisks. This problem was neglected in the earlier papers.