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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

2.2K
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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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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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.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
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Potentiometry: Overview01:06

Potentiometry: Overview

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Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
891
Potentiometric Titration: Overview01:31

Potentiometric Titration: Overview

5.6K
Potentiometric titration is a quantitative analytical technique that determines the concentration of an analyte by measuring the potential difference between the two electrodes in the solution. The endpoint of a potentiometric titration is the point at which there is a significant change in the potential difference. It occurs when the stoichiometric reaction between the analyte and the titrant is complete. The endpoint is usually determined graphically by plotting the measured potential...
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Multi-analyte Biochip MAB Based on All-solid-state Ion-selective Electrodes ASSISE for Physiological Research
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Spray-coated all-solid-state potentiometric sensors.

Ewa Jaworska1, Morten Schmidt, Giuseppe Scarpa

  • 1Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland. agatam@chem.uw.edu.pl.

The Analyst
|October 2, 2014
PubMed
Summary
This summary is machine-generated.

A new spray-coating technique simplifies the creation of all-solid-state ion-selective electrodes. This low-cost, automated method produces disposable sensors with performance comparable to traditional electrodes.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Traditional ion-selective electrodes (ISEs) can be complex to manufacture.
  • Screen-printed electrodes, while simpler, may face issues with compositional stability.
  • There is a need for cost-effective, disposable sensors for potentiometric applications.

Purpose of the Study:

  • To introduce a novel, fully spray-coating-based method for preparing all-solid-state ion-selective electrodes.
  • To demonstrate a simplified sensor construction using spray-coated carbon nanotubes.
  • To evaluate the performance and applicability of this new method for various ion-selective sensors.

Main Methods:

  • Spray coating of carbon nanotubes on an inert support for electrical lead and transducer functions.
  • Spray coating of ion-selective membranes and insulator layers.
  • Preparation and characterization of model potassium-selective sensors.
  • Testing the method for H(+) and Cl(-) sensors.

Main Results:

  • Achieved fully automatic sensor preparation with minimized chemical usage.
  • Developed low-cost, disposable sensors with simplified construction.
  • Potassium-selective sensors demonstrated analytical parameters comparable to conventional ISEs.
  • Successfully applied the method to prepare H(+) and Cl(-) sensors.

Conclusions:

  • The proposed spray-coating method offers an efficient and cost-effective alternative for producing all-solid-state ion-selective electrodes.
  • This approach enables the fabrication of disposable sensors with reliable performance.
  • The method is versatile and applicable to a range of ion-selective sensor types.