Amperometric nitrite sensor based on a glassy carbon electrode modified with multi-walled carbon nanotubes and poly(toluidine blue)
- 513 Downloads
An amperometric nitrite sensor modified with multi-walled carbon nanotubes (MWCNTs) and poly(toluidine blue) (PTB) on glassy carbon electrode was constructed. The surface morphology of the composite- modified electrode was characterized by scanning electron microscopy, and the electrochemical response behavior and electrocatalytic oxidation mechanism of nitrite were investigated by cyclic voltammetry. The high surface-to-volume ratio of MWCNTs and PTB brings the electrochemical sensing unit and nitrite in full contact. This renders the electrochemical response extremely sensitive to nitrite. Under the optimal measurement conditions and a working voltage of 0.73 V (vs. SCE), a linear relationship is obtained between the oxidation peak current and nitrite concentration in the range of 39 nM–1.1 mM, and the limit of detection is lowered to 19 nM (at an S/N ratio of 3). The sensor was successfully applied to the determination of nitrite in greenhouse soils.
KeywordsCyclic voltammetry Scanning electron microscopy Amperometry Electrocatalytic oxidation Electropolymerization Nanocomposite Greenhouse soil
This work was supported by the National High Technology Research and Development Program (863 Program) of China (2012AA101405).
Compliance with ethical standards
All authors declare that no competing interests exist.
- 1.de Mey E, de Klerck K, de Maere H, Dewulf L, Derdelinckx G, Peeters MC, Fraeye I, Heyden YV, Paelinck H (2014) The occurrence of N-nitrosamines, residual nitrite and biogenic amines in commercial dry fermented sausages and evaluation of their occasional relation. Meat Sci 96:821–828CrossRefGoogle Scholar
- 6.He LJ, Zhang KG, Wang CJ, Luo XL, Zhang SS (2011) Effective indirect enrichment and determination of nitrite ion in water and biological samples using ionic liquid-dispersive liquid-liquid microextraction combined with high-performance liquid chromatography. J Chromatogr A 1218:3595–3600CrossRefGoogle Scholar
- 20.Zeng JX, Wei WZ, Zhai XR, Yang PH, Yin J, Wu L, Liu XY, Liu K, Gong SG (2006) Assemble electrodeposited ultrathin conducting poly(azure a) at a carbon nanotube modified glassy carbon electrode, and its electrocatalytic properties to the reduction of nitrite. Microchim Acta 155:379–386CrossRefGoogle Scholar
- 28.Salimi A, Noorbakhash A, Karonian FS (2006) Amperometric detection of nitrite, iodate and periodate on glassy carbon electrode modified with thionin and multi-wall carbon nanotubes. Int J Electrochem 1:435–445Google Scholar
- 34.Li P, Ding Y, Wang A, Zhou L, Wei SH, Zhou YM, Tang YW, Chen Y, Cai CX, Lu TH (2013) Self-assembly of tetrakis (3-trifluoromethylphenoxy) phthalocyaninato cobalt (II) on multiwalled carbon nanotubes and their amperometric sensing application for nitrite. ACS Appl Mater Interfaces 5:2255–2260CrossRefGoogle Scholar