Journal
MICROCHIMICA ACTA
Volume 175, Issue 3-4, Pages 251-257Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-011-0688-y
Keywords
Amperometric sensor; Electrocatalytic oxidation; Nitrite; Cobalt oxide
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Funding
- National Natural Science Foundation of China [20875076]
- Science Foundation of Northwest University [NF0902]
- NWU [08YYB06]
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We describe a modified glassy carbon electrode (GCE) for the sensitive determination of nitrite in waste water samples. The GCE was modified by electrodeposition of cobalt oxide nanoparticles on multi-walled carbon nanotubes (MWCNTs) deposited on a conventional GCE. Scanning electron microscopy and electrochemical techniques were used for the characterization of the composite material which is very uniform and forms a kind of nanoporous structure. Electrochemical experiments showed that the modified electrode exhibited excellent electrocatalytic properties for nitrite. Amperometry revealed a good linear relationship between peak current and nitrate concentration in the 0.5 to 250 mu M range with a detection limit of 0.3 mu M (S/N = 3). The method has been applied to the amperometric detection of nitrite. The modified electrode displays good storage stability, reproducibility, and selectivity for a promising practical application.
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