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Proceedings Paper

Ion-selective electrodes with polypyrrole- and poly(3-octylthiophene)-mediated internal solid contact in soil analysis
Author(s): Tanja Radu; Aleksandar Radu; Dermot Diamond
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Paper Abstract

The integration of chemo/bio sensors in large wireless sensing networks (WSN) is currently limited, largely due to the issues related with power consumption and data handling. Also, there are very few low cost chemo/bio sensors that combine sensitive, low limit of detection capabilities with simple experimental setup. However, with recent advances, ion-selective electrodes (ISEs) may become an excellent candidate for deployment in WSNs. In this paper, we describe a solid-contact electrode based on poly(3-octylthiophene) (POT) as an internal contact. We report its characteristics and its application to the for measurement of Pb2+ in 16 soil samples, with a ultimate goal of producing a small, simple and sensitive sensor that can be integrated into WSNs. The electrode had a detection in the soil digestion matrix (1×10-3 M HNO3) of 1×10-7 M (20 ppb). The electrodes results were compared with atomic absorbtion spectrometry (AAS) as a common instrumental technique used in soil analysis. We also report on the performance of solid-contact ISEs based on polypyrrole (PPy) and POT. A superior detection limit of POT- relative to PPy-based ISEs was observed. Furthermore, a good correlation has been observed between POT-based ISEs and AAS and between the two types of ISEs.

Paper Details

Date Published: 29 October 2007
PDF: 10 pages
Proc. SPIE 6749, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII, 674922 (29 October 2007); doi: 10.1117/12.737333
Show Author Affiliations
Tanja Radu, Dublin City Univ. (Ireland)
Aleksandar Radu, Dublin City Univ. (Ireland)
Dermot Diamond, Dublin City Univ. (Ireland)

Published in SPIE Proceedings Vol. 6749:
Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII
Manfred Ehlers; Ulrich Michel, Editor(s)

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