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Solid-Contact Ion-Selective Electrodes Based on Graphite Paste for Potentiometric Nitrate and Ammonium Determinations
Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg, Waldheim, Germany
Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg, Waldheim, Germany
Technische Universität Dresden, Dresden, Germany
- 1 Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg, Waldheim, Germany
- 2 Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg, Waldheim, Germany
- 3 Technische Universität Dresden, Dresden, Germany
American Journal of Analytical Chemistry·Volume 09 (2018)·Pages 591–601·Published 4 December 2018·DOI10.4236/ajac.2018.912043
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Abstract
Robust and easy-to-handle solid-contact ion-selective electrodes (SC-ISEs) based on graphite paste have been developed for the potentiometric detection of NO - 3 and NH + 4 in environmental samples. Polypyrrole (PPy) has been used as intermediate layer and solid contact between the electron-conducting graphite paste substrate and the ion-conducting polyvinylchloride (PVC)-containing membrane with the immobilized ionophore. For the nitrate- and ammonium-selective electrodes, tridodecylmethylammonium nitrate (TDMA-NO 3 ) and nonactin have been used as ion-complexing compounds, respectively. Both ISEs show nearly Nernstian response in the linear range from 10 -5 mol/L to 10 -1 mol/L with average slopes of >58 mV/decade. The ISEs possess short response times (<20 s).
KeywordsSolid-Contact ElectrodeGraphite PasteAll-Solid-State ConfigurationIon-Complexing CompoundEnvironmental Samples
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