Design and properties of a flow-injection analysis cell using potassium-selective ion-sensitive field-effect transistors as detection elements |
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Authors: | Peter D. van der Wal Ernst J.R. Sudhölter David N. Reinhoudt |
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Affiliation: | Laboratory of Organic Chemistry, University of Twente, P.O. Box 217, 7500 AE Enschede The Netherlands |
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Abstract: | The combination of flow-injection analysis (FIA) and chemically modified ion-sensitive field-effect transistors (CHEMFETs) is described. In a wall-jet cell, two identical potassium-selective CHEMFETs were used for a differential measurement using a platinum (pseudo-)reference electrode. Silicone-rubber membrane materials, chemically bound to the SiO2 gate oxide, were used with valinomycin as the ionophore. The optimized FIA system showed a linear response of 56 mV per decade for potassium concentrations above 5 × 10?5 M. Preliminary results of potassium determinations in human serum and urine samples are presented. |
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Keywords: | Flow system Voltammetry Ion-sensitive field-effect transistors Potassium Serum Urine |
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