Author: Glossary
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Polymer membrane electrode
An electrode in which the sensing membrane is an organic polymer containing a hydrophobic ion-exchange neutral carrier (ionophore).
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Point electrode
An electrode with an insulating handle at one end and a small metallic terminal at the other for use in applying static sparks.
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Oxygen electrode
An electrode invented by Dr. Leland Clark, used to measure the partial pressure of oxygen (Po2), usually in arterial blood (blood gas).
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Negative electrode
A cathode; the pole by which electric current leaves the generating source.
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Multiple point electrode
Several sets of terminals providing for the use of several electrodes.
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Liquid membrane electrode
An electrode in which the sensing membrane is made up of a hydrophobic ion-exchange neutral carrier (ionophore) dissolved in a viscous, water-insoluble solvent. The liquid membrane is physically supported by an inert porous matrix such as cellulose acetate.
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Ion-selective electrode
A chemical transducer that yields a response to variations in the concentration of a given ion in solution.
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Internal reference electrode
The metal electrode inside all chemical-sensing potentiometric electrodes. The two most commonly used internal reference electrodes are the calomel and the silver/ silver chloride.
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Immobilized enzyme electrode
A chemical sensor that is highly selective due to a specific enzyme incorporated into its structure.
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Hydrogen electrode
An electrode that absorbs and measures hydrogen gas; used as the reference for pH measurement in research laboratories.