Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 655, Issue 1, Pages 45-49Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2011.02.010
Keywords
8-Hydroxyquinoline; Cosmetic; Multiwall carbon nanotube; Voltammetric sensor
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Funding
- National Natural Science Foundation of China [20775073, 20875083]
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In this paper, a multiwall carbon nanotube/Nafion composite modified glassy carbon electrode (MWNT/Nafion/GCE) was used as a voltammetric sensor to determine 8-hydroxyquinoline (8-HQ) in cosmetic. This voltammetric sensor exhibited strong catalytic effect toward the oxidation of 8-HQ and caused an anodic peak at 0.97 V in HAc-NaAc buffer solution (0.2 M, pH 3.6). Under the optimized condition, the anodic peak current was linear with the concentration of 8-HQ in the range of 2 x 10(-8) M-1.0 x 10(-5) M. The detection limit was 9 x 10(-9) M. The practical application of MWNT/Nafion/GCE was carried out for determining 8-HQ in cosmetic sample with satisfactory results. The electrode reaction mechanism was studied by cyclic voltammetry and UV-vis spectra. (C) 2011 Elsevier B.V. All rights reserved.
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