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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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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: Overview01:06

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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

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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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Potentiometry: Types of Electrodes01:19

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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.
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Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
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Sponge-based microfluidic sampling for potentiometric ion sensing.

Ruiyu Ding1, Grzegorz Lisak2

  • 1College of Engineering, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

Analytica Chimica Acta
|November 5, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces novel microfluidic sponge sampling for ion analysis, offering a simpler alternative to paper or textile methods. Sponges enable direct heavy metal measurement without substrate modification, matching traditional techniques for clinical and environmental samples.

Keywords:
Clinical and environmental samplesHeavy metal analysisMicrofluidic sponge-based samplingPotentiometric ion sensing

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Microfluidic paper- and textile-based sampling methods have limitations for ion analysis.
  • A need exists for alternative, robust sampling substrates in microfluidic devices.
  • Ion-selective electrodes (ISEs) are crucial for various analytical measurements.

Purpose of the Study:

  • To develop and evaluate a novel microfluidic sponge-based sampling technique for ion analysis.
  • To compare sponge sampling with existing paper- and textile-based methods.
  • To assess the suitability of sponges for analyzing environmental and clinical samples.

Main Methods:

  • Three types of sponges (polyurethane, cellulose, natural) were investigated as substrates for microfluidic sampling.
  • Polyurethane sponges were specifically assessed for microfluidic sampling coupled with ion-selective electrodes.
  • Sponge-based sampling was integrated with ISEs for the determination of heavy metals (Cd2+, Pb2+) and clinical ions (K+, Na+, Cl-).

Main Results:

  • Polyurethane sponges demonstrated low heavy metal sorption, making them suitable for microfluidic sampling with ISEs.
  • Sponge-based microfluidic sampling allowed direct measurement of heavy metals without substrate pre-treatment, unlike paper/textile methods.
  • Potassium, sodium, and chloride levels in wastewater sludge and sweat samples determined via sponge sampling and ISEs correlated well with ICP-OES and IC analyses.

Conclusions:

  • Microfluidic sponge-based sampling presents a viable and advantageous alternative for ion analysis in diverse sample types.
  • The direct measurement capability for heavy metals simplifies the analytical workflow.
  • This method shows promise for both environmental monitoring and clinical diagnostics.