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    Modern directions for potentiometric sensors

    Access Status
    Open access via publisher
    Authors
    Bakker, Eric
    Chumbimuni-Torres, K.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Bakker, Eric and Chumbimuni-Torres, Karin. 2008. Modern directions for potentiometric sensors. Journal of the Brazilian Chemical Society. 19 (4): 621-629.
    Source Title
    Journal of the Brazilian Chemical Society
    DOI
    10.1590/S0103-50532008000400003
    Faculty
    Nanochemistry Research Centre
    School
    Nanochemistry Research Institute (Research Institute)
    URI
    http://hdl.handle.net/20.500.11937/7207
    Collection
    • Curtin Research Publications
    Abstract

    This paper gives an overview of the newest developments of polymeric membrane ion-selective electrodes. A short essence of the underlying theory is given, emphasizing how the electromotive force may be used to assess binding constants of the ionophore, and how the selectivity and detection limit are related to the basic membrane processes. The recent developments in lowering the detection limits of ISEs are described, including recent approaches of developing all solid state ISEs, and breakthroughs in detecting ultra-small quantities of ions at low concentrations. These developments have paved the way to use potentiometric sensors as in ultra-sensitive affinity bioanalysis in conjunction with nanoparticle labels. Recent results establish that potentiometry compares favorably to electrochemical stripping analysis. Other new developments with ion-selective electrodes are also described, including the concept of backside calibration potentiometry, controlled current coulometry, pulsed chronopotentiometry, and localized flash titration with ion-selective membranes to design sensors for the direct detection of total acidity without net sample perturbation. These developments have further opened the field for exciting new possibilities and applications.

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