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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

2.3K
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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Titration of Polyprotic Base with a Strong Acid01:18

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The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
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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...
855
Amperometry: Overview01:10

Amperometry: Overview

2.2K
Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
2.2K
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

2.7K
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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Updated: Apr 7, 2026

Multi-analyte Biochip MAB Based on All-solid-state Ion-selective Electrodes ASSISE for Physiological Research
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Robust and Ultrasensitive Polymer Membrane-Based Carbonate-Selective Electrodes.

Lukasz Mendecki1, Tolulope Fayose1, Kelli A Stockmal2

  • 1†Lennard-Jones Laboratories, Birchall Centre, Keele University, Keele, Staffordshire ST5 5BG, United Kingdom.

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Summary

Researchers developed ultrasensitive ion-selective electrodes (ISEs) for precise carbonate detection. This breakthrough significantly lowers detection limits for environmental and clinical applications.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Environmental Science

Background:

  • Accurate quantitative analysis of carbonate species is crucial for environmental monitoring, disease screening, and personalized medicine.
  • Existing carbonate sensors have limitations in sensitivity and detection limits.
  • Ion-selective electrodes (ISEs) offer a potential platform for improved carbonate detection.

Discussion:

  • This study introduces the first ultrasensitive ion-selective electrodes (ISEs) for carbonate detection.
  • A modified sensor conditioning protocol drastically reduced ion fluxes, achieving picomolar detection limits.
  • The new ISEs demonstrate a low detection limit (LDL) of 80 pmol L(-1), four orders of magnitude lower than current sensors.

Key Insights:

  • The novel ISEs provide near-Nernstian potentiometric responses to carbonate ions.
  • The technology was successfully applied for direct carbonate determination in seawater samples.
  • The developed electrodes exhibit high reproducibility, robustness, and durability.

Outlook:

  • This approach paves the way for developing highly sensitive and robust ISEs for in situ measurements.
  • Potential applications include advanced environmental monitoring and improved clinical diagnostics.
  • Further research may focus on adapting this methodology for detecting other critical ions.