Journal
TALANTA
Volume 150, Issue -, Pages 198-205Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2015.12.016
Keywords
Chromium(VI); Polyaniline; Graphene quantum dot; Stopped-flow analysis; Voltammetry
Categories
Funding
- Thailand Research Fund through Research Team Promotion Grant [RTA5780005]
- Thai Government [TKK2555]
- Ratchadaphiseksomphot Endowment Fund, Chulalongkorn University
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Polyaniline/graphene quantum dots (PANI/GQDs) were used to modify a screen-printed carbon electrode (SPCE) in a flow-based system. A method for rapidly determining the Cr(VI) concentrations by using stopped-flow analysis has been developed using an Auto-Pret system coupled with linear-sweep voltammetry using the PANI/GQD-modified SPCE. The GQDs, synthesized in a botton-up manner from citric acid, were mixed with aniline monomer in an optimized ratio. The mixture was injected into an electrochemical flow cell in which electro-polymerization of the aniline monomer occurred. Under conditions optimized for determining Cr(VI), wide linearity was obtained in the range of 0.1-10 mg L-1, with a detection limit of 0.097 mg L-1. For a sample volume of 0.5 mL, the modified SPCE can be used continuously with a sample-throughput of more than 90 samples per hour. In addition, this proposed method was successfully applied to mineral water samples with acceptable accuracy, and the quantitative agreement was accomplished in deteriorated Cr-plating solutions with a standard traditional method for Cr(VI) detection. (C) 2015 Elsevier B.V. All rights reserved.
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