A conductive polypyrrole based ammonium ion selective electrode.
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.
Quan
D P
DP
Centre of Environmental Chemistry, Vietnam National University, Hanoi.
Quang
C X
CX
Duan
L T
LT
Viet
P H
PH
D004563:Electrochemistry; D004566:Electrodes; D004784:Environmental Monitoring / Q000379:methods*; D005068:Eutrophication; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012680:Sensitivity and Specificity; D014873:Water Pollutants / Q000032:analysis*
D011108:Polymers; D011758:Pyrroles; D000644:Quaternary Ammonium Compounds; D014873:Water Pollutants; C067635:polypyrrole