Preferred Label : ion-selective electrode;
Detailed label : ion-selective electrode (ISE);
IUPAC acronym : ISE;
IUPAC definition : An electrochemical sensor, based on thin films or selective membranes as recognition
elements, and an electrochemical half-cell equivalent to other half-cells of the zeroth
(inert metal in a redox electrolyte), 1st, 2nd and 3rd kinds. These devices are distinct
from systems that involve redox reactions (electrodes of zeroth, 1st, 2nd and 3rd
kinds), although they often contain a 2nd kind electrode as the 'inner' or 'internal'
reference electrode. The potential difference response has, as its principal component,
the Gibbs energy change associated with permselective mass transfer (by ion-exchange,
solvent extraction or some other mechanism) across a phase boundary. The ion-selective
electrode must be used in conjunction with a reference electrode (i.e. 'outer' or
'external' reference electrode) to form a complete electrochemical cell. The measured
potential differences (ion-selective electrode vs. outer reference electrode potentials)
are linearly dependent on the logarithm of the activity of a given ion in solution.
Comment: The term 'ion-specific electrode' is not recommended. The term 'specific'
implies that the electrode does not respond to additional ions. Since no electrode
is truly specific for one ion, the term 'ion-selective' is recommended as more appropriate.
'Selective ion-sensitive electrode' is a little-used term to describe an ion-selective
electrode. 'Principal' or 'primary' ions are those which an electrode is designed
to measure. It is never certain that the 'principal' ion is most sensitively measured,
e.g. nitrate ion-selective electrodes.;
Origin ID : I03244;
Automatic exact mappings (from CISMeF team)
See also
An electrochemical sensor, based on thin films or selective membranes as recognition
elements, and an electrochemical half-cell equivalent to other half-cells of the zeroth
(inert metal in a redox electrolyte), 1st, 2nd and 3rd kinds. These devices are distinct
from systems that involve redox reactions (electrodes of zeroth, 1st, 2nd and 3rd
kinds), although they often contain a 2nd kind electrode as the 'inner' or 'internal'
reference electrode. The potential difference response has, as its principal component,
the Gibbs energy change associated with permselective mass transfer (by ion-exchange,
solvent extraction or some other mechanism) across a phase boundary. The ion-selective
electrode must be used in conjunction with a reference electrode (i.e. 'outer' or
'external' reference electrode) to form a complete electrochemical cell. The measured
potential differences (ion-selective electrode vs. outer reference electrode potentials)
are linearly dependent on the logarithm of the activity of a given ion in solution.
Comment: The term 'ion-specific electrode' is not recommended. The term 'specific'
implies that the electrode does not respond to additional ions. Since no electrode
is truly specific for one ion, the term 'ion-selective' is recommended as more appropriate.
'Selective ion-sensitive electrode' is a little-used term to describe an ion-selective
electrode. 'Principal' or 'primary' ions are those which an electrode is designed
to measure. It is never certain that the 'principal' ion is most sensitively measured,
e.g. nitrate ion-selective electrodes.