Constant potential electrolysis (control-potential electrolysis):

This electrogravimetric technique is also known as potentiostatic method. In this technique potential of the working electrode is managed at a constant level versus a reference electrode, such as the SCE. This method needs additional equipment such as electronic voltmeter, a potentiostat and a reference electrode.

By these methods are simple but the sensitivity is the issue in those methods as it is limited through the hardness in determining the small difference in mass among the electrode itself and the electrode plus deposit. Another limitation along with this method is need of washing and drying of the electrode, thus it is limited to electrode reaction including the formation of insoluble substances. Therefore, electrogravimetric methods are limited to detection of metals that could provide smooth and adherent metal platings and deposits. The physical features of a deposit depend on the form of the metal ion in the solution, a presence of absorbable surface-active agents in the solution and other factors. For instance, brighter deposits are acquired from the solution of Ag⁺ in a CN^- medium than from a nitrate medium. The further of surface- active agents like as gelatin, frequent leads to improve deposits.