Chemosensors 2017, 5(1), 2; doi:10.3390/chemosensors5010002
Nitrate Ion Selective Electrode Based on Ion Imprinted Poly(N-methylpyrrole)
Department of Mechanical, Aerospace, and Biomedical Engineering, Center for Laser Applications, University of Tennessee Space Institute, 411 B. H. Goethert Parkway MS 24, Tullahoma, TN 37388, USA
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Author to whom correspondence should be addressed.
Academic Editor: Peter Lieberzeit
Received: 7 October 2016 / Revised: 12 December 2016 / Accepted: 12 December 2016 / Published: 4 January 2017
(This article belongs to the Special Issue Molecularly Imprinted Polymers—Robust Artificial Receptor Materials for Chemical Sensing)
Abstract
A poly(N-methylpyrrole) based ion selective electrode (ISE) has been prepared by electro-polymerization of N-methylpyrrole using potassium nitrate as the supporting electrolyte. Electrochemical and chemical variables were used to optimize the potentiometric response of the electrodes and to maximize the selectivity for nitrate over potential interferences. The selectivity, longevity and stability of the ion-imprinted polymer give this electrode advantages over traditional nitrate ISEs. The best prototype electrode exhibits a linear potential response to nitrate ion within the concentration range of 5.0 × 10−6 to 0.1 M nitrate with a near Nernstian slope of −56.3 mV per decade (R2 = 0.9998) and a strong preference for the nitrate ion over other anions. The selectivity coefficients of the electrode were evaluated by the fixed interference method. The use of N-methylpyrrole has advantages over pyrrole in terms of selectivity and pH insensitivity. View Full-TextKeywords:
ion selective electrode; conductive polymer; N-methylpyrrole
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Bomar, E.M.; Owens, G.S.; Murray, G.M. Nitrate Ion Selective Electrode Based on Ion Imprinted Poly(N-methylpyrrole). Chemosensors 2017, 5, 2.
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