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Application of sepiolite/FeS2 nanocomposite for highly selective detection of mercury(II) based on stripping voltammetric analysis

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Abstract

In this work, a novel electrochemical sensor for trace detection of Hg(II) is fabricated using sepiolite/pyrite (Sep/FeS2) nanocomposite. A mixture of the synthesized Sep/FeS2, graphite powder and paraffin oil was packed into a glass tube to fabricate modified carbon paste electrode for detection of Hg(II). The square wave anodic stripping voltammetry (SWASV) method was used for the determination of target metal ions after open-circuit mode. The effects of experimental conditions, such as the pre-concentration solution pH, pre-concentration time, and deposition potential and deposition time were investigated to optimize the conditions for maximum electrochemical signal. At optimal conditions, a linear range from 10 to 120 nM with a detection limit of 4.12 nM was obtained for the proposed electrochemical method. The selectivity investigations showed that the several heavy metal ions did not interfere with the quantitative Hg(II) determination. Moreover, the stability and reproducibility of the presented modified electrode was also evaluated with satisfactory results. Finally, the sensor was used to analyze the Hg(II) concentration in real water samples.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Hakim Sabzevari University, PO. Box 397, Sabzevar, Iran

    Mina-Sadat Koshki & Mehdi Baghayeri

  2. Department of Environment, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran

    Maryam Fayazi

Authors
  1. Mina-Sadat Koshki
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  2. Mehdi Baghayeri
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  3. Maryam Fayazi
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Contributions

MB: corresponding author; proposing of this study; methodology, writing-original draft preparation, M-SK: student and performed the electrochemical experiments, reviewing and editing, MF: investigation, synthesized and characterized the nanocomposite.

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Correspondence to Mehdi Baghayeri.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Koshki, MS., Baghayeri, M. & Fayazi, M. Application of sepiolite/FeS2 nanocomposite for highly selective detection of mercury(II) based on stripping voltammetric analysis. Food Measure 15, 5318–5325 (2021). https://doi.org/10.1007/s11694-021-01097-0

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  • DOI: https://doi.org/10.1007/s11694-021-01097-0

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