https://doi.org/10.1351/goldbook.E01940
In voltammetry and related techniques, a substance that undergoes a change of
oxidation state
, or the breaking or formation of chemical bonds, in a charge-transfer step
. If an electroactive substance B is formed, in the solution or electrode, by a chemical reaction
from another substance C, the substance C should be called the precursor of B. In potentiometry with ion-selective electrodes
, a material containing, or in ion-exchange equilibrium with, the sensed ion. The electroactive substance is often incorporated in an inert
matrix such as poly(vinyl chloride) or silicone rubber.