TITLE:
All-Solid-State Screen-Printed Sensors for Potentiometric Calcium(II) Determinations in Environmental Samples
AUTHORS:
Johannes Schwarz, Kathrin Trommer, Frank Gerlach, Michael Mertig
KEYWORDS:
All-Solid-State Sensor, Ca2+-Selective Electrode, Potentiometric Titration, Environmental Samples
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.9 No.3,
March
9,
2018
ABSTRACT: 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 6 months. The novel potentiometric ASS
sensors enable simple and exact Ca2+ determinations in real samples.