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http://dx.doi.org/10.5229/JKES.2004.7.3.148

Comparative Studies on Ammonium Ion Selective Electrodes Using Poly(Vinyl Chloride) and Polyurethane as Substrate Matrix Materials  

Cho Chang-Ae (Department of Chemistry and Center for Integrared Molecular Systems Pohang University of Science and Technology)
Park Su-Moon (Department of Chemistry and Center for Integrared Molecular Systems Pohang University of Science and Technology)
Publication Information
Journal of the Korean Electrochemical Society / v.7, no.3, 2004 , pp. 148-154 More about this Journal
Abstract
Ammonium ion selective electrodes have been prepared using nonactin as an ionophore and poly(vinyl chloride) (PVC) or polyurethane(PU) as a polymer matrix with or without a plasticizer, bis(2-ethylhexyl) adipate, and their performances have been evaluated. The reults indicate that PU-based electrodes can be designed to perform better although PVC-based electrodes generally show better performances. In efforts to explain the obervation, we also carried out atomic force microscopy as well as impedance studies, and the results suggests that islands of ion-ophores are formed in the PVC membranes through which ion transfers appear to be more facile than through the PU membranes. The PU membranes appear to have ionophores better dispersed throughout the film and are more resistive to ion mobilities in comparison to PVC films.
Keywords
Ammonium ion; ion Selective Electrodes; PVC; Polyurethane.;
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