Abstract
A nitrate sensor for the determination of nitrate in ground and tapwater is described with regard to teh 3-S problem (selectivity, sensitivity and stability). It is based on an ion-selective electrode (ISE) with a poly(vinyl chloride) (PVC) membrane. Over a wide linear range with 1.5±0.2× 10 t-6 mol/l nitrate as the limit of detection the sensor shows a slope of 57.0±1.0 mV/decade. Due to the good selectivity against most of the other anions of ground or tapwater (sulfate, hydrogencarbonate, hydrogenphosphate, chloride) nitrate can be determined nearly without any interference. In contrast to the usual PVC membrane electrodes the lifetime of this nitrate sensor is more than 15 months.
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