A conductive polypyrrole based ammonium ion selective electrode |
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Authors: | Quan D P Quang C X Duan L T Viet P H |
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Affiliation: | (1) Centre of Environmental Chemistry, Vietnam National University, Hanoi, Vietnam;(2) Centre of Environmental Chemistry, Vietnam National University, Hanoi, Vietnam |
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Abstract: | In view of the development of miniaturized sensor arrays, a solid-contact ammonium ion selective electrode has been investigated. A conductive polypyrrole film was electrochemicallydeposited on a glassy carbon surface and used as an internal solid contact layer between the sensing membrane and solid electrode surface. A systematic evaluation of the importantparameters affecting the electromotive force (emf) response ispresented. The performances of this solid-contact sensor were verified using a batch-mode measurement setup and a wall-jet flow cell system. The designed sensor exhibited excellent selectivity for the primary ion and a linear response over the pNH4+ range 1–5 with a slope of 56.3 mV decade-1. The sensor has a fast response and is relativelyrobustness, and was also used to determine ammonium concentrations in natural waters, with promising results. |
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Keywords: | ammonium conductive polypyrrole ion selectiveelectrode solid-contact sensor |
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