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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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Related Experiment Video

Updated: Mar 15, 2026

Making, Testing, and Using Potassium Ion Selective Microelectrodes in Tissue Slices of Adult Brain
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Solid contact potassium selective electrodes for biomedical applications - a review.

L van de Velde1, E d'Angremont1, W Olthuis1

  • 1BIOS Lab-on-a-Chip Group, MESA Institute for Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, The Netherlands.

Talanta
|September 4, 2016
PubMed
Summary
This summary is machine-generated.

Miniaturized solid-state ion-selective electrodes (ISEs) offer improved stability and selectivity for potassium sensing. These advancements enable on-site biomedical applications and flexible sensor designs for real-time monitoring.

Keywords:
Conducting nanomaterialsConducting polymersISEPotassiumPotentiometrySolid-state

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Biomedical Engineering

Background:

  • Ion-selective electrodes (ISEs) are crucial for measuring potassium concentration in biological samples.
  • Miniaturization is essential for on-site and advanced biomedical applications.
  • Solid contacts are replacing liquid contacts in ISEs, enabling industrial production of miniaturized sensors.

Purpose of the Study:

  • To review recent developments in solid-state ISEs for potassium sensing.
  • To critically compare different solid contact materials for potassium ISEs.
  • To discuss future prospects of miniaturized ISEs in biomedical applications.

Main Methods:

  • Comparison of polypyrrole, polythiophenes, and conducting nanomaterials as solid contact layers.
  • Analysis of stability, selectivity, and response time of various solid-state potassium ISEs.
  • Review of recent innovations in sensor design and operational methods.

Main Results:

  • Solid contact materials significantly enhance the stability, selectivity, and response time of potassium ISEs.
  • New materials have enabled numerous performance improvements in solid-state ISEs.
  • Advancements include flexible sensors and multi-electrode designs for small sample volumes.

Conclusions:

  • Solid-state ISEs represent a significant advancement for potassium determination in biomedical settings.
  • Future developments focus on miniaturized, flexible, and multi-analyte sensors for point-of-care applications.
  • These technologies hold promise for real-time monitoring of electrolyte concentrations and ionic flows.