TY - JOUR
T1 - Design and properties of a flow-injection analysis cell using potassium-selective ionsensitive field-effect transistors as detection elements
AU - van der Wal, Peter D.
AU - Sudhölter, Ernst J.R.
AU - Reinhoudt, David N.
PY - 1991
Y1 - 1991
N2 - 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.
AB - 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.
U2 - 10.1016/S0003-2670(00)80216-0
DO - 10.1016/S0003-2670(00)80216-0
M3 - Article
SN - 0003-2670
VL - 245
SP - 159
EP - 166
JO - Analytica chimica acta
JF - Analytica chimica acta
ER -