ION-SELECTIVE FIELD-EFFECT TRANSISTOR FOR NITRITE DETERMINATION IN FLOW-CELL

In this paper the nitrite selective electrochemical sensor based on fi eld effect transistor as transducer was presented. The sensing layer, PVC plasticized membrane, contained uranyl salophen as an anion recept or. The performance of nitrite-selective ISFETs was verified in the st ationary measurement and in the flow cell system. Developed sensors ex hibit a good selectivity for nitrite ions over other inorganic anions and show linear response in the range 1-4 of pNO(2)(-) with a slope of 37 mV decade(-1). These microdevices can be applied in determination and monitoring of nitrite in flow cell system (even in the presence of nitrate anions).