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Related Experiment Videos

Microelectrode of the Thomas type using a liquid membrane electrode.

M Stokols1, S K Corona, L R Pucacco

  • 1Department of Internal Medicine, University of Texas Health Science Center, Southwestern Medical School, Dallas 75235.

Analytical Biochemistry
|June 1, 1987
PubMed
Summary
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A new liquid membrane-based pH electrode offers an easier-to-manufacture alternative to traditional glass electrodes. This modified Thomas electrode demonstrates comparable sensitivity and response times without requiring specialized equipment or materials.

Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Biomedical Engineering

Background:

  • Traditional glass-based pH electrodes require specialized manufacturing processes.
  • The glass membrane pH microelectrode necessitates specific equipment like a forge and glass materials.
  • Previous research established glass-based electrodes for pH measurement.

Purpose of the Study:

  • To develop a modified Thomas electrode utilizing a liquid membrane-based pH electrode.
  • To create an easily manufacturable alternative to the glass-based pH electrode.
  • To assess the performance characteristics of the novel liquid membrane electrode.

Main Methods:

  • Replacement of the glass membrane in a Thomas electrode with a liquid membrane-based pH electrode.

Related Experiment Videos

  • Manufacturing the modified electrode without specialized equipment (forge) or materials (glass).
  • Characterization of electrode performance including sensitivity, response time, and electrical resistance.

    • Main Results:

    • A modified Thomas electrode with a liquid membrane-based pH electrode was successfully developed.
    • The manufacturing process for the new electrode is simpler and requires less specialized resources.
    • Performance metrics, including sensitivity (57.4 +/- 0.22 mV/pH unit), response time (20.0 +/- 2.67 s), and electrical resistance (3.48 +/- 0.67 X 10(11) ohm), were comparable to glass-based electrodes.

    Conclusions:

    • The liquid membrane-based modified Thomas electrode is a viable and easier-to-manufacture alternative to glass-based electrodes.
    • This development reduces manufacturing complexity and material requirements for pH electrodes.
    • The electrode's performance characteristics support its potential application in various analytical settings.