Abstract
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 μM range with a detection limit of 0.3 μM (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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The authors appreciate the financial support from the National Natural Science Foundation of China (No.20875076), the Science Foundation of Northwest University (No. NF0902) and the NWU Doctorate Dissertation of Excellence Funds (No. 08YYB06).
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Meng, Z., Liu, B., Zheng, J. et al. Electrodeposition of cobalt oxide nanoparticles on carbon nanotubes, and their electrocatalytic properties for nitrite electrooxidation. Microchim Acta 175, 251–257 (2011). https://doi.org/10.1007/s00604-011-0688-y
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DOI: https://doi.org/10.1007/s00604-011-0688-y