Abstract
A quasi-continuous monitoring system for nitrate and ammonium in ground water is described. Both parameters change dramatically in the case of a leakage of a dump site. Due to their cost efficiency and easy maintenance new potentiometric chemical sensors become more evident in the field of continuous control of ground water. The extremely selective and sensitive sensors presented here show an increased long-lasting stability as well as an improvement in the limits of detection. After addition of auxiliary reagents such sensors allow a quantitive and nearly selective determination of nitrate and ammonium. Combined with an appropriate data transfer system a cost effect continuous monitoring system is built working over more than six months without refilling.
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