Arabian Journal for Science and Engineering

, Volume 44, Issue 1, pp 217–226 | Cite as

Modified Lanthanum–Zeolite for Sensitive Electrochemical Detection of Heavy Metal Ions

  • A. Ismail
  • A. Kawde
  • O. Muraza
  • M. A. Sanhoob
  • Md. Abdul Aziz
  • A. R. Al-BetarEmail author
Research Article - Chemistry


Lanthanum-zeolite carbon paste electrode was synthesized and investigated as an alternative electrode for electrochemical detection of Pb(II) and Cd(II) ions. Prior to the analysis, mordenite zeolite with \(\hbox {SiO}_{2}/\hbox {Al}_{2}\hbox {O}_{3}\) ratio of 15 was synthesized and characterized by XRD, SEM, EDX and XPS. Composite electrode was fabricated by mixing carbon graphite, lanthanum-impregnated zeolite and paraffin oil until a uniform paste was formed. Preliminary studies showed that the electrode with 2 wt% lanthanum impregnation (2 wt% La-MOR/CPE) gave a better response toward the detection of Pb(II) ion. Accumulation of Pb(II) ion was achieved at a potential of − 1.2 V (vs. Ag/AgCl) for 120 s followed by anodic stripping scan in the range of − 1.6 to 0 V. Analytical figures of merit for the 2 wt% La-MOR/CPE are comparable with other reported electrodes. The detection limit (\(S/N = 3\)) for single detection of Pb(II) was 0.23 ppb. On the other hand for simultaneous detection of Pb(II) and Cd(II) ions, detection limits were found to be 0.24 and 0.12 ppb, respectively. The composite electrode demonstrates the potential to be used in the quantification of heavy metals due to its simplicity, low cost of fabrication, lack of toxicity, and speed of analysis


Lanthanum–zeolite Square wave voltammograms Lead (II) Cadmium (II) 


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The authors would like to acknowledge the support provided by the Deanship of Scientific Research (DSR) at King Fahd University of Petroleum and Minerals for funding this work through Project No. JF141005. The facilities provided by the Chemistry Department and the Center of Research Excellence in Nanotechnology at King Fahd University of Petroleum and Minerals are highly appreciated.


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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.Chemistry DepartmentKing Fahd University of Petroleum and MineralsDhahranSaudi Arabia
  2. 2.Chemical Engineering DepartmentKing Fahd University of Petroleum and MineralsDhahranSaudi Arabia
  3. 3.Center of Research Excellence in NanotechnologyKing Fahd University of Petroleum and MineralsDhahranSaudi Arabia

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