Enhanced Electrochemical Detection Of Multi-Heavy Metal Ions Using A Biopolymer-Coated Planar Carbon Electrode

Keywords

biopolymer-coated carbon electrode; chitosan; heavy metal ions; lead; square wave anodic stripping voltammetry; zinc

Abstract

In this study, a chitosan biopolymer-coated planar carbon electrode was developed for in situ determination of heavy metals (Zn2+ and Pb2+) using square wave anodic stripping voltammetry (SWASV). 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 0.1M acetate buffer at pH 4.6. Two distinguished peaks were observed at-0.86 and-0.37V, which are associated with the stripping of Zn2+ and Pb2+, respectively. Limit of detection (LOD) was 0.6 and 1 ppb for Zn2+ and Pb2+, respectively, and the relative standard deviations (RSD) for repetitive measurements of Zn2+ and Pb2+ were in the range of 4.8-5.4 % (n=30 with two identical electrodes). Overall, the developed biopolymer-coated carbon electrode exhibited excellent representativeness and reproductivity for in situ multi heavy metal ions detection in spiked samples, holding a great promise for on-site testing of heavy metals in drinking water.

Publication Date

4-11-2018

Publication Title

2018 IEEE Sensors Applications Symposium, SAS 2018 - Proceedings

Volume

2018-January

Number of Pages

1-6

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/SAS.2018.8336744

Socpus ID

85050126628 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85050126628

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