| Autor: |
Quan DP; Centre of Environmental Chemistry, Vietnam National University, Hanoi., Quang CX, Duan LT, Viet PH |
| Jazyk: |
angličtina |
| Zdroj: |
Environmental monitoring and assessment [Environ Monit Assess] 2001 Jul; Vol. 70 (1-2), pp. 153-65. |
| DOI: |
10.1023/a:1010622422561 |
| 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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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