NITRATE SENSOR SYSTEM FOR CONTINUOUS-FLOW MONITORING

This paper reports on a new flow-through potentiometric sensor system with miniaturized nitrate and reference electrodes. The influence of p arameters such as flow rate and membrane thickness on the nitrate sens or system are discussed in respect to an application in environmental monitoring of nitrate for example in ground water and water plants. Th e developed sensor system has a small size, shows a linear working ran ge extending from 1.0 X 10(-5) to about 10(-2) mol/l and a lifetime of more than 6 months. Due to only negligible interferences of the nitra te determination from chloride and sulfate in the system, this system is useful for continuous sensing of the environmental status in ground water reservoirs.