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has been cited by the following article:

• TITLE: Solid-Contact Ion-Selective Electrodes Based on Graphite Paste for Potentiometric Nitrate and Ammonium Determinations

  AUTHORS: Johannes Schwarz, Kathrin Trommer, Michael Mertig

  KEYWORDS: Solid-Contact Electrode, Graphite Paste, All-Solid-State Configuration, Ion-Complexing Compound, Environmental Samples

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.9 No.12, December 4, 2018

  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-NO3) 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 (