Abstract
The potential of several ion-sensitive electrodes responds to the incorporated cations and anions. This has led some authors to misinterpret the potential of metal salt membrane electrodes and of electrodes of the second kind. Neglecting the kinetics of potential establishment and interpreting the potentials solely based on thermodynamics produce completely irrelevant data and suggest that ion concentrations down to 10−45 mol L−1 are accessible by simple potentiometric measurements. The switching from cation to anion response mechanism cannot be derived from thermodynamic equations. It bears complete similarity to the switching of response in the case of foreign interfering ions.
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