Highly sensitive detection of hexavalent chromium utilizing a sol-gel/carbon nanotube modified electrode.
A pyridine-functionalized thin film has been fabricated to selectively preconcentrate Cr(VI) anions for electrochemical detection in the 5-300 μg L-1range. Glassy carbon electrodes were modified through physical deposition of single-walled carbon nanotubes (SWNTs) on the electrode surface, followed by electrochemical deposition of a sol-gel containing a 2-pyridine functional group. The use of SWNTs has increased sensitivity for Cr(VI) detection in aqueous solutions, providing a detection limit of 0.8 μg L-1.
Department of Chemistry, University of Tennessee, Knoxville, TN 37996, USA.
Samuel M
SM
Rosolina
Department of Chemistry, University of Tennessee, Knoxville, TN 37996, USA.
Stefanie A
SA
Bragg
Department of Chemistry, University of Tennessee, Knoxville, TN 37996, USA.
Ruizhuo
R
Ouyang
Department of Chemistry, University of Tennessee, Knoxville, TN 37996, USA.
James Q
JQ
Chambers
Department of Chemistry, University of Tennessee, Knoxville, TN 37996, USA.
Zi-Ling
ZL
Xue
chromium detection; glassy carbon electrode; iridescence; single-walled carbon nanotubes; solgel; thin film