Author(s)

Johannes Schwarz^1*, Kathrin Trommer¹, Frank Gerlach¹, Michael Mertig^1,2

¹Kurt-Schwabe-Institut für Mess- und Sensortechnik e.V. Meinsberg, Waldheim, Germany.
²Institut für Physikalische Chemie, Technische Universität Dresden, Dresden, Germany.

This paper describes preparation, characterization and electrochemical performance of novel planar miniaturized all-solid-state (ASS) screen-printed potentiometric sensors for the detection of Ca²⁺ ions in environmental samples. Screen-printed graphite-based ion-selective electrodes (ISEs) and screen-printed reference electrodes based on silver-containing pastes have been applied in a space saving manner on common ceramic substrates with small dimensions. Applications to environmental samples are shown by direct potentiometry and potentiometric titrations in real water samples. Conducting polymers (CPs) have been used as solid-contact materials and as intermediate layer between the polyvinyl chloride (PVC)-containing ion-selective membrane and the graphite-containing substrate. Different diamides have been incorporated into the PVC membrane. In the range from 10^-4 mol/L to 10^-1 mol/L, the ISEs show linear slopes of 27 mV/decade, which is close to the Nernstian response. Moreover, the ISEs have response times of <25 s and a life time of >6 months. The novel potentiometric ASS sensors enable simple and exact Ca²⁺ determinations in real samples.

All-Solid-State Sensor, Ca²⁺-Selective Electrode, Potentiometric Titration, Environmental Samples

Schwarz, J. , Trommer, K. , Gerlach, F. and Mertig, M. (2018) All-Solid-State Screen-Printed Sensors for Potentiometric Calcium(II) Determinations in Environmental Samples. American Journal of Analytical Chemistry, 9, 113-123. doi: 10.4236/ajac.2018.93010.