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    Background current elimination in thin layer ion-selective membrane coulometry

    Access Status
    Fulltext not available
    Authors
    Grygolowicz-Pawlak, Ewa
    Bakker, Eric
    Date
    2010
    Type
    Journal Article
    
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    Citation
    Grygolowicz-Pawlak, Ewa and Bakker, Eric. 2010. Background current elimination in thin layer ion-selective membrane coulometry. Electrochemistry Communications. 12 (9): pp. 1195-1198.
    Source Title
    Electrochemistry Communications
    DOI
    10.1016/j.elecom.2010.06.017
    ISSN
    13882481
    School
    Nanochemistry Research Institute (Research Institute)
    URI
    http://hdl.handle.net/20.500.11937/33972
    Collection
    • Curtin Research Publications
    Abstract

    A promising method for the elimination of undesired capacitive currents in view of realizing a potentially calibration free coulometric ion detection system is presented. The coulometric cell is composed of a porous polypropylene tube doped with a liquid calcium-selective membrane and a silver/silver chloride wire as an inner electrode, forming a thin layer sample between wire and tubing. The total charge passed through the system during potential controlled electrolysis of the thin layer sample is indeed found to be proportional to the amount of calcium present, but non-Faradaic processes do contribute to the obtained signal. We introduce here a multi-pulse procedure that allows one to perform a second excitation pulse at the same excitation potential after exhaustive ion transfer voltammetry of calcium has taken place. The intercept of the calibration curve after background subtraction is found as 20.6 ± 0.6 μC, significantly lower than the value of 54.1 ± 0.8 μC for the uncorrected curve. Changes in sample temperature (from 23 °C to 38 °C) did equally not affect the background corrected coulometric readings, supporting that the procedure renders the readout principle more robust.

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