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    Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes

    Access Status
    Fulltext not available
    Authors
    Chumbimuni-Torres, K.
    Calvo-Marzal, P.
    Wang, J.
    Bakker, Eric
    Date
    2008
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Chumbimuni-Torres, Karin Y. and Calvo-Marzal, Percy and Wang, Joseph and Bakker, Eric. 2008. Electrochemical Sample Matrix Elimination for Trace-Level Potentiometric Detection with Polymeric Membrane Ion-Selective Electrodes. Analytical Chemistry 80: 6114-6118.
    Source Title
    Analytical Chemistry
    DOI
    10.1021/ac800595p
    Additional URLs
    http://pubs.acs.org/journals/amcham/index.html
    Faculty
    Nanochemistry Research Centre
    School
    Nanochemistry Research Institute (Research Institute)
    Remarks

    Open access to this article will be available 12 months after publication via the website of the American Chemical Society. http://acswebcontent.acs.org/home.html

    The website for Analytical Chemistry is available at:

    URI
    http://hdl.handle.net/20.500.11937/44252
    Collection
    • Curtin Research Publications
    Abstract

    Potentiometric sensors are today sufficiently well understood and optimized to reach ultratrace level (subnanomolar) detection limits for numerous ions. In many cases of practical relevance, however, a high electrolyte background hampers the attainable detection limits. A particularly difficult sample matrix for potentiometric detection is seawater, where the high saline concentration forms a major interfering background and reduces the activity of most trace metals by complexation. This paper describes for the first time a hyphenated system for the online electrochemically modulated preconcentration and matrix elimination of trace metals, combined with a downstream potentiometric detection with solid contact polymeric membrane ion-selective microelectrodes. Following the preconcentration at the bismuth-coated electrode, the deposited metals are oxidized and released to a medium favorable to potentiometric detection, in this case calcium nitrate. Matrix interferences arising from the saline sample medium are thus circumvented. This concept is successfully evaluated with cadmium as a model trace element and offers potentiometric detection down to low parts per billion levels in samples containing 0.5 M NaCl background electrolyte.

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