Polyaniline/graphene quantum dot-modified screen-printed carbon electrode for the rapid determination of Cr(VI) using stopped-flow analysis coupled with voltammetric technique

Talanta
Eakkasit PunratOrawon Chailapakul

Abstract

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 m L, 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.

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Citations

Aug 16, 2016·Biosensors & Bioelectronics·Stefano Cinti, Fabiana Arduini
Aug 16, 2016·Biosensors & Bioelectronics·Hong-Yu ZhangLiang Feng
Nov 9, 2016·Analytica Chimica Acta·J MolinaL M Moretto
Jan 8, 2018·Environmental Science and Pollution Research International·Yilin JiangQingyun He
Apr 24, 2019·Nanomaterials·Susana CampuzanoJosé M Pingarrón
Sep 13, 2020·Sensors·Nazha HilaliAbdelhamid Errachid
Dec 17, 2020·Chemical Society Reviews·Callie M SternNoémie Elgrishi
Apr 14, 2020·Materials Science & Engineering. C, Materials for Biological Applications·Bolu SunFangdi Hu
Dec 9, 2020·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Ziting Zhang, Zhefeng Fan
Oct 30, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Mona JaniMing Ni
Mar 7, 2021·Polymers·I Jénnifer GómezNuria Alegret

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