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Simultaneous determination of trace Cd2+ and Pb2+ using GR/L-cysteine/Bi modified screen-printing electrodes

Abstract

The GR/L-cys/Bi/SPE (reduced graphene oxide/L-cysteine/Bi/screen-printing electrode) was prepared to simultaneously determinate Cd2+ and Pb2+ ions by using SWASV (square wave anodic stripping voltammetry). The experimental conditions of the Cd2+ and Pb2+ determination including the deposition potential, the deposition time, pH and Bi3+ concentration were optimized. Well-defined peaks of Cd2+ and Pb2+ ions could be achieved. Under the optimized conditions, the calibration curves were obtained with linear ranges from 10 µg/L to 50 µg/L for Cd2+, and from 10 µg/L to 50 µg/L for Pb2+, with detection limit of 0.98 and 0.56 µg/L, respectively. Their fitting equations are I(µA)=0.13C(µg/L) +0.60 (R2=0.9976) for Cd2+ ion, and I(µA)=0.10C(µg/L)+0.51 (R2=0.9896) for Pb2+ ion, respectively. The GR/L-cys/Bi/SPE exhibits many merits with high selectivity, low detection limit, low fabrication costs and wide linear ranges. The GR/L-cys/Bi/SPE has great potential for the determination of Cd2+ and Pb2+ in real water samples.

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Supplementary files

Publication details

The article was received on 27 Jul 2018, accepted on 13 Sep 2018 and first published on 13 Sep 2018


Article type: Paper
DOI: 10.1039/C8AY01676C
Citation: Anal. Methods, 2018, Accepted Manuscript
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    Simultaneous determination of trace Cd2+ and Pb2+ using GR/L-cysteine/Bi modified screen-printing electrodes

    C. Li, X. Zhao and X. Han, Anal. Methods, 2018, Accepted Manuscript , DOI: 10.1039/C8AY01676C

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