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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...
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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

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Introduction to Solid Supported Membrane Based Electrophysiology
19:56

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Published on: May 11, 2013

Silver(I)-selective membrane electrodes based on sulfur-containing podands.

S Chung1, W Kim, S B Park

  • 1Department of Chemistry and Research Institute of Basic Sciences, Inje University, Kimhae 621-749, South Korea.

Talanta
|July 1, 1997
PubMed
Summary
This summary is machine-generated.

New polymeric membrane electrodes show high selectivity for silver ions (Ag+). These sensors effectively distinguish Ag+ from other heavy metals and alkali ions, offering a promising tool for ion detection.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Polymeric membrane electrodes are crucial for ion detection.
  • Acyclic polyethers, known as podands, can serve as membrane-active components.
  • Developing selective sensors for specific metal ions is an ongoing challenge.

Purpose of the Study:

  • To prepare and evaluate Ag(+)-selective polymeric membrane electrodes using podands.
  • To assess the selectivity of these electrodes towards various metal ions.
  • To investigate the performance characteristics of the developed sensor systems.

Main Methods:

  • Synthesis of podand derivatives, specifically thiapodands.
  • Fabrication of polymeric membrane electrodes incorporating the thiapodands.
  • Electrochemical measurements using static and flow-injection systems.
  • Selectivity testing against various heavy metal and alkali ions.

Main Results:

  • Thiapodand-based electrodes demonstrated significant selectivity for Ag(+) over Cd(2+), Pb(2+), Cu(2+), and Hg(2+).
  • Good selectivity was also observed against alkali and alkali earth metal ions.
  • The sensor systems exhibited favorable response slopes, pH effects, response times, and baseline return.

Conclusions:

  • Thiapodand derivatives are effective membrane-active components for Ag(+)-selective electrodes.
  • The observed Ag(+)-selectivity is attributed to soft-soft interactions with sulfur donors and stacking interactions of aromatic end groups.
  • These findings highlight the potential of thiapodand-based sensors for accurate silver ion detection.