Design and properties of a flow-injection analysis cell using potassium-selective ionsensitive field-effect transistors as detection elements

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Wal, Peter D. van der and Sudhölter, Ernst J.R. and Reinhoudt, David N. (1991) Design and properties of a flow-injection analysis cell using potassium-selective ionsensitive field-effect transistors as detection elements. Analytica Chimica Acta, 245 . pp. 159-166. ISSN 0003-2670

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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.
Item Type:Article
Copyright:© 1991 Elsevier Science
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Link to this item:http://purl.utwente.nl/publications/12512
Official URL:http://dx.doi.org/10.1016/S0003-2670(00)80216-0
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