Abstract
A simple disposable thick-film potentiometric strip has been developed and evaluated for hydroponics application. The strip consisted of low ion-selective electrodes (ISE) fabricated by screen-printing technology. The electrochemical responses of ion sensors for nitrate, ammonium, potassium, and magnesium were measured with specially designed 16-channel low voltage signal transducers. The analytical characteristics of the sensors were comparable with those of conventional ISE sensors. The thick-film sensors exhibit linear relationships over five concentration decades. The concentration of N <TEX>$O_3$</TEX> - ion in standard solution can be determined by direct potentiometric measurements without any conditioning before measurements. However, measurement of <TEX>$K^{+}$</TEX>, N <TEX>$H_4$</TEX><TEX>$^{+}$</TEX>, and <TEX>$Mg^{2+}$</TEX> ionic concentrations in nutrient solutions seems not feasible.
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