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Preparation of electrochemically treated nanoporous pencil-graphite electrodes for the simultaneous determination of Pb and Cd in water samples

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Abstract

A simple and rapid analytical method of determining Pb2+ and Cd2+ in water samples using an electrochemically pretreated pencil-graphite electrode (EP-PGE) is proposed for the first time in the literature. An electrochemically pretreated pencil-graphite electrode was prepared by performing potential cycling between −0.3 V and 2.0 V in 0.1 mol L−1 H3PO4 solution to improve its ability to electrochemically sense Pb2+ and Cd2+ ions. Square-wave anodic stripping voltammetry (SWASV) was used as the electroanalytical method. The electroanalytical parameters that influence the stripping determination of Pb2+ and Cd2+ were optimized based on experimental results. The magnitude of the peak oxidation current was adjusted in order to optimize the value of each parameter. Applying the resulting disposable electrode under the optimized conditions led to good selectivity and sensitivity in the determination of Pb2+ and Cd2+ ions. Interference from coexisting ions was also investigated. The resulting sensor was successfully tested by applying it to a standard reference water sample. Under the optimized conditions, the limits of detection were 0.46 μg L−1 for Pb2+ and 1.11 μg L−1 for Cd2+ using the electrode. Relative standard deviations (%RSD) were 2.76 for Pb2+ and 2.85 for Cd2+. The linear working ranges of the electrode for Pb2+ and Cd2+ ion detection were 5–45 μg L−1 and 10–40 μg L−1, respectively.

Preparation of nanoporous pencil-graphite electrode by cyclic voltammetry and stripping voltammetric screening of Pb and Cd

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Acknowledgements

Betül Kahraman, Tuğba Güven, Dilay Ünal, and Dilara Kılıç are kindly acknowledged for fruitful discussions about this topic and for providing us with useful information.

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Authors and Affiliations

  1. Materials & Chemical Research Department, Mir Araştırma ve Geliştirme A.S, 34220, İstanbul, Turkey

    Koray B. Dönmez, Ebru Çetinkaya, Seda Deveci, Sevinç Karadağ & Mustafa Doğu

  2. Faculty of Science and Art, Department of Chemistry, Yıldız Technical University, 34220, İstanbul, Turkey

    Koray B. Dönmez & Yücel Şahin

Authors
  1. Koray B. Dönmez
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  2. Ebru Çetinkaya
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  3. Seda Deveci
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  4. Sevinç Karadağ
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  5. Yücel Şahin
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  6. Mustafa Doğu
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Correspondence to Ebru Çetinkaya or Yücel Şahin.

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Dönmez, K.B., Çetinkaya, E., Deveci, S. et al. Preparation of electrochemically treated nanoporous pencil-graphite electrodes for the simultaneous determination of Pb and Cd in water samples. Anal Bioanal Chem 409, 4827–4837 (2017). https://doi.org/10.1007/s00216-017-0426-3

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  • DOI: https://doi.org/10.1007/s00216-017-0426-3

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