Enhanced Electrochemical Detection of Multiheavy Metal Ions Using a Biopolymer-Coated Planar Carbon Electrode

Jae-Hoon Hwang,Woo Hyoung Lee,Xiaochen Wang,Matthew M Rex,Hyoung J Cho,Pawan Pathak

doi:10.1109/tim.2019.2908045

Jae-Hoon Hwang, Woo Hyoung Lee + Show 4 more

https://doi.org/10.1109/tim.2019.2908045

Copy DOI

Export

Save

Cite

Abstract
Full-Text
Similar Papers

Abstract

Listen

In this paper, a chitosan biopolymer-coated planar carbon electrode was developed for in situ determination of heavy metals (Zn 2+ and Pb 2+ ) using square-wave anodic stripping voltammetry. The experimental conditions were optimized with respect to deposition time, amplitude, and frequency. With 300-s deposition time, the heavy metal stripping was conducted at 0.05-V pulse amplitude, 20-Hz pulse frequency, and 0.004-V square-wave step voltage in 0.1-M acetate buffer at pH 4.6. Two distinguished peaks were observed at -0.86 and -0.37 V, which are associated with the stripping of Zn 2+ and Pb 2+ , respectively. The limit of detection was 0.6 and 1 ppb for Zn 2+ and Pb 2+ , respectively, and the relative standard deviations for repetitive measurements of Zn 2+ and Pb 2+ were in the range of 4.8%-5.4% (n = 30 with two identical electrodes). The chitosan biopolymer-coated carbon electrode was successfully applied for detecting Pb 2+ in tap water, mining wastewater, and soil leachate, and showed a reliable performance for measuring heavy metals with acceptable reproducibility. Overall, the developed biopolymer-coated carbon electrode exhibited excellent representativeness and reproductivity for in situ multiheavy metal ions detection in spiked samples, holding a great promise for on-site testing of heavy metals in drinking water.

Full Text