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A pressure- and flow-insensitive reference electrode liquid junction

E D Crandall, J DeLong

    Journal of Applied Physiology
    |July 1, 1976
    PubMed
    Summary
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    A novel, inexpensive liquid junction for ion concentration electrodes offers stable measurements insensitive to pressure and flow variations. This robust design enables rapid, accurate pH determination with negligible artifacts and a response time under 10 ms.

    Area of Science:

    • Electrochemistry
    • Analytical Chemistry
    • Chemical Engineering

    Background:

    • Ion concentration electrode systems often suffer from drift and artifacts caused by pressure and flow variations.
    • Existing reference liquid junctions can be complex, expensive, or difficult to construct and maintain.

    Purpose of the Study:

    • To design and construct a pressure- and flow-insensitive reference liquid junction for ion concentration electrode systems.
    • To evaluate the performance of the new junction in a pH-measuring system.
    • To demonstrate the utility of the device for determining reaction kinetics.

    Main Methods:

    • A novel, inexpensive, and easily constructed reference liquid junction was designed and built.
    • The junction was integrated into a pH-measuring system.

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  • The system's performance was assessed by evaluating drift, pressure artifacts, and flow artifacts.
  • The dissociation reaction rate constant of carbonic acid (H2CO3) was determined using the developed pH electrode device.

    • Main Results:

    • The developed liquid junction proved to be insensitive to pressure and flow variations.
    • Drift, pressure artifacts, and flow artifacts were negligible when used in a pH-measuring system.
    • The system exhibited a rapid response time, appearing to be less than 10 milliseconds.
    • The dissociation reaction rate constant of H2CO3 at 24°C was determined to be 22 s⁻¹.

    Conclusions:

    • The designed reference liquid junction is a cost-effective, robust, and adaptable solution for ion concentration electrode systems.
    • This innovation significantly reduces measurement errors associated with pressure and flow, enhancing accuracy and reliability.
    • The device facilitates precise kinetic studies, as demonstrated by the accurate determination of the H2CO3 dissociation rate constant.