| Autor: |
Quan, Do Phuc1, Quang, Chu Xuan1, Duan, Le The1, Viet, Pham Hung1 cec@fpt.vn |
| Předmět: |
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| Zdroj: |
Environmental Monitoring & Assessment. Jul2001, Vol. 70 Issue 1/2, p153-165. 13p. |
| Abstrakt: |
In view of the development of miniaturized sensor arrays, a solid-contact ammonium ion selective electrode has been investigated. A conductive polypyrrole film was electrochemically deposited 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 important parameters affecting the electromotive force (emf) response is presented. 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 relatively robustness, and was also used to determine ammonium concentrations in natural waters, with promising results. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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