American Journal of Analytical Chemistry

Volume 9, Issue 3 (March 2018)

ISSN Print: 2156-8251   ISSN Online: 2156-8278

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All-Solid-State Screen-Printed Sensors for Potentiometric Calcium(II) Determinations in Environmental Samples

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DOI: 10.4236/ajac.2018.93010    909 Downloads   2,010 Views  Citations

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 <25 s and a life time of >6 months. The novel potentiometric ASS sensors enable simple and exact Ca2+ determinations in real samples.

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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.

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