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Ion-Selective Electrodes

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Abstract:

Ion-Selective electrodes (ISEs) are among chemical methods of analysis, and one of major chemical sensors that include bioaffinity-, gas-, ion- and other molecular sensors. A common feature for these chemical sensors is that molecular recognition of analytes takes place chemically by e.g., bioreceptors, and various synthetic supramolecular receptors, immobilized in many cases on solid substrates. The molecular recognition process is followed by appropriate signal transductions such as electrochemical, optical, and gravimetric methods. ISE chemistry involves permselective transport of analyte ions from adjacent aqueous sample solutions into ionophore-incorporated organic liquid membranes. This process leads to ion-selective charge separation at the aqueous/organic interface, and the change in boundary potentials therefrom becomes a measure for the analyte ion concentrations (activities). The present review article summarizes the current status of both liquid membrane and solid membrane ion-selective electrodes as to their response mechanisms and sensor developments. Examples are taken mainly from the authors' laboratory due to the space limitation.

Keywords: CHEMICAL SENSOR; ELECTRIC DOUBLE LAYER; FT-IR-ATR; ION-CHANNEL SENSOR; ION-SELECTIVE CHARGE SEPARATION; IONOPHORE-BASED LIQUID MEMBRANE; MEMBRANE BOUNDARY POTENTIAL; NERNSTIAN RESPONSE; PERMSELECTIVE ION TRANSFER; POTENTIOMETRY; SHG

Document Type: Review Article

DOI: http://dx.doi.org/10.1166/sl.2005.021

Publication date: June 1, 2005

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