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 (of potential E _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 _ref ) and one or two electrolytes. Depending on whether there are one or two electrolytes, the potentiometric chain can be written :

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