Adsorptive stripping voltammetric determination of nitroimidazole derivative on multiwalled carbon nanotube modified electrodes: Influence of size and functionalization of nanotubes

Paola Jara-Ulloa, Paulina Cañete-Rosales, Luis J. Núñez-Vergara, Juan A. Squella

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

7 Citas (Scopus)

Resumen

1-Methyl-4-nitro-2-brominemethylimidazole (4-NimMeBr), was electrochemically reduced on mercury, glassy carbon and multiwalled carbon nanotubes (MWCNT) modified electrodes. 4-NimMeBr was adsorbed on the MWCNT modified electrode thus permitting the implementation of an adsorptive stripping voltammetric (ASV) method. We have used 4-NimMeBr as a prototype electroactive nitro compound to study the effect of both the size of the nanotubes and its functionalization by oxidation. The oxidized MWCNT forms better dispersions than the non-oxidized, producing electrode surface with higher density of MWCNT as was determined by electrochemical mapping using scanning electrochemical microscopy (SECM). Under the optimized conditions, the peak current was proportional to the concentration of 4-NimMeBr in the range of 10-6 mol L-1 to 10-4 mol L-1 with detection and quantification limits of 4.41×10-6 mol L-1 and 6.21×10-6 mol L-1, respectively. The sensibility of bare electrode was 0.01 μA per μmol L-1, which was lower than the value of 5.34 and 6.97 μA per mmol L-1 obtained using short and large oxidized MWCNT, respectively.

Idioma originalInglés
Páginas (desde-hasta)1271-1278
Número de páginas8
PublicaciónJournal of the Brazilian Chemical Society
Volumen22
N.º7
DOI
EstadoPublicada - 2011

Áreas temáticas de ASJC Scopus

  • Química (todo)

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