Constant Current Coulometry (Amperostatic Coulometry):

This method is better called as coulometric titration. Within a coulometric titration, a titrant which is electrolytically produced reacts stoichiometrically along with another and proceeds with l00 percent effectiveness. It includes a single chemical modify in the analyte. Coulometric titration has a special benefit within the sense which a standard solution is not needed. This method is extremely meaningful for the estimation of micro and semi-micro quantities of substances.

Figure: Schematic of a coulometric titration

Above figure depicts the principal components of a classical coulometric titrator. A source of constant current (amperostat) and a switch which concurrently initiates the current and begins an electronic timer are needs. The potential drop across the standard resistor, R_std is used for the measurement. Several electronic or electromechanical amperostats are available within the market.