Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 33, Issue 8, Pages 4972-4977Publisher
ELSEVIER
DOI: 10.1016/j.msec.2013.08.020
Keywords
Chromium; Screen-printed carbon electrode; Catalytic adsorptive stripping voltammetry; Multi-walled carbon nanotubes; Quercetin
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Funding
- Birjand University Research Council
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A novel screen-printed carbon electrode modified with quercetin/multi-walled carbon nanotubes was fabricated for determination of Cr(VI) in the presence of excess of Cr(III) without any pretreatment The method is based on accumulation of the quercetin-Cr(III) complex generated in situ from Cr(VI) at the modified electrode surface in an open circuit followed by differential pulse voltammetry detection. The new method allowed selective determination of Cr(VI) in the presence of Cr(III). The influence of various parameters affecting the adsorptive stripping voltammetry performance was investigated. Under the optimum conditions, the calibration plot was found to be linear in the Cr(VI) concentration range from 1.0 to 200 mu mol(-1) with a limit of detection(S/N = 3) of 03 mu mol L-1. The relative standard deviation (RSD%) of seven replicates of the current measurements for a 50 mu mol(-1) of Cr(VI) solution was 3.0%. The developed electrode displayed a very low or no sensitivity to alkali, alkali-earth and transition metal cations and was successfully applied for the determination of Cr(VI) in drinking water samples. (C) 2013 Elsevier B.V. All rights reserved.
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