1. Definitions

Potentiometry is an analytical method that links a measurement of electrode potential to the activity of a species in solution. The corresponding electrode is called an indicator electrode.

The indicator electrode (potential $E_{\text{ind}}$ ), chosen according to the nature of the solute to be determined, is included in a galvanic chain comprising a reference electrode (of potential $E_{\text{ref}}$ ) and one or two electrolytes:

• if there is only one electrolyte, we write the potentiometric chain: E _ref ...