Chemically modified ion-sensitive field-effect transistors: elimination of the liquid junction potential in a double sensor flow-injection analysis cell

P.L.H.M. Cobben, Peter L.H.M. Cobben, Richard J.M. Egberink, Johan G. Bomer, Robert Schouwenaar, Zbigniew Brzozka, Piet Bergveld, David Reinhoudt, M. Bos

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    Abstract

    A flow-through cell was designed that can be used for flow-injection analysis with two chemically modified ion-sensitive field-effect transistors (CHEMFETs) in close proximity. This offers the possibility of a differential measurement without influence of the liquid junction potential. The differential signal of a potassium- and a sodium-selective CHEMFET responded in a Nernstian manner and selectively towards potassium in an excess (fixed) concentration of sodium. A highly lead-selective CHEMFET was used in the same flow cell in combination with a potassium-selective CHEMFET.
    Original languageUndefined
    Pages (from-to)347-352
    JournalAnalytica chimica acta
    Volume276
    Issue number2
    DOIs
    Publication statusPublished - 1993

    Keywords

    • IR-12573
    • METIS-106754

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