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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

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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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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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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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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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Controlled-Potential Coulometry: Electrolytic Methods01:17

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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...
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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Paper-based potentiometric ion sensing.

Wen-Jie Lan1, Xu U Zou, Mahiar M Hamedi

  • 1Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Cambridge, Massachusetts 02138, United States.

Analytical Chemistry
|September 9, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed novel ion-sensing electrochemical paper-based analytical devices (EPADs) for portable electrolyte analysis. These disposable EPADs offer accurate potentiometric measurements of ions like chloride, potassium, sodium, and calcium in aqueous solutions.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Materials Science

Background:

  • Electrochemical paper-based analytical devices (EPADs) offer a promising platform for point-of-care diagnostics.
  • Accurate potentiometric measurements require stable and integrated reference electrodes.
  • Existing methods for electrolyte analysis can be complex and expensive.

Purpose of the Study:

  • To design and fabricate novel ion-sensing EPADs with integrated paper reference electrodes.
  • To evaluate the performance of these EPADs for the potentiometric determination of various electrolyte ions.
  • To establish EPADs as a portable, cost-effective, and disposable tool for electrolyte analysis.

Main Methods:

  • Fabrication of single-layer EPADs using printed wax barriers to define sample and reference zones.
  • Integration of a miniaturized paper reference electrode with ion-selective paper electrodes (ISPEs).
  • Incorporation of Ag/AgCl electrodes and PVC-based ion-selective membranes for specific ion sensing (Cl-, K+, Na+, Ca2+).

Main Results:

  • EPADs demonstrated a linear potentiometric response over three orders of magnitude for various electrolyte concentrations.
  • The observed slopes were close to the theoretical Nernstian value (59.2/z mV).
  • Successful detection of chloride, potassium, sodium, and calcium ions in aqueous samples.

Conclusions:

  • Ion-sensing EPADs with integrated paper reference electrodes provide a viable method for potentiometric ion measurements.
  • These devices are portable, inexpensive, and disposable, making them suitable for diverse applications.
  • EPADs represent a significant advancement in accessible electrochemical sensing technology.