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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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 the...
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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...
Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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 ensures...
Potentiometry: Overview01:06

Potentiometry: Overview

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 the...
Electrodes: Overview01:17

Electrodes: Overview

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.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in the...

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Multi-analyte Biochip (MAB) Based on All-solid-state Ion-selective Electrodes (ASSISE) for Physiological Research
08:03

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Conducting polymer ion sensor electrodes-III. Potentiometric sulfide ion selective electrode.

N F Atta1, A Galal, H B Mark

  • 1Department of Chemistry, Faculty of Science, University of Cairo, Giza, Egypt.

Talanta
|October 31, 2008
PubMed
Summary

A novel potentiometric sensor electrode using conducting polymer films offers stable and selective sulfide detection. Its microsize capability is ideal for measuring sulfide in biological environments, including biofilms.

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Published on: November 22, 2016

Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Science

Background:

  • Sulfide detection is crucial in biological and environmental monitoring.
  • Existing methods may lack selectivity or the ability to operate in diverse conditions.
  • Conducting polymers offer potential for advanced sensor development.

Purpose of the Study:

  • To introduce a new potentiometric sensor electrode for sulfide detection.
  • To evaluate the electrode's performance, stability, and selectivity.
  • To assess its suitability for microscale measurements in biological environments.

Main Methods:

  • Electrochemical deposition of poly(3-methylthiophene) and poly(dibenzo-18-crown-6) films onto a low-melting-point alloy substrate.
  • Fabrication of a microsize version of the electrode.
  • Testing of electrode response stability, working temperature range, linear dynamic range, and pH tolerance.

Main Results:

  • The developed electrode demonstrated stable response for up to 3 days.
  • It operates effectively within a temperature range of 10-40°C.
  • The sensor exhibits a linear dynamic range of 1.0x10⁻⁷–1.0x10⁻² M sulfide across a broad pH range (1-13) with high selectivity.

Conclusions:

  • The new conducting polymer-based potentiometric sensor is effective for total sulfide measurement.
  • Its microscale manufacturability and selectivity make it suitable for biological applications.
  • The electrode shows significant promise for in-situ sulfide monitoring within biofilms.