Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 135, Issue 1, Pages 61-65Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.07.019
Keywords
Nitrophenol isomers; Voltammetric; Determination; Carbon nanotube
Funding
- National Natural Science Foundation of China [20571051]
- Shanghai Municipal Education [J50102]
- Shanghai University, China.
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Cyclic voltammetry was used to investigate the electrochemical reduction of nitrophenol isomers at a glassy carbon electrode modified with carbon nanotubes, and a derivative voltammetric technique was adopted to improve the resolution and enhance the determination sensitivity. In 0.1 mol L-1 HAc-NaAc buffer solution (pH 5.0), the modified electrode showed a good electrocatalytic response towards nitrophenol isomers. Through a derivative technique, the peak currents increased significantly and the reduction peaks of nitrophenol isomers Could be separated, so the method could be applied to direct simultaneous determination without preseparation, The linear calibration ranges were 4.0 x 10(-6) to 2.0 x 10(-3) mol L-1 for o-nitrophenol, 1.0 x 10(-5) to 1.0 X 10(-3) mol L-1 for m-nitrophenol and 2 x 10(-6) to 4.0 x 10(-3) mol L-1 for p-nitrophenol, with detection limits of 5. 0 X 10(-7), 6.0 x 10(-6) and 4.0 x 10(-7) mol L-1, respectively. (c) 2008 Elsevier B.V. All rights reserved.
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