A highly Selective Potentiometric Sensor for Detection of Zn(II) Using Carbon Paste Electrode Based on Molecular Imprinted Polymer in Petroleum Water Samples

Document Type : Original Article


1 Chemistry Department, Faculty of Science, Helwan University

2 Egyptian Petroleum Research Institute (EPRI), 11727, Cairo, Egypt.

3 Chemistry Department, Faculty of Science, Cairo University, 12613 Giza Egypt

4 Chemistry, Faculty of Science, Helwan University


For the purpose of determining the presence of zinc(II) in petroleum water samples, a molecular imprinted polymer (MIP) based modified carbon paste potentiometric method was described. Methacrylic acid monomers and ethylene glycol dimethacrylate were used in the polymerization process to create the MIP. The generated imprinted polymer was evaluated using flame atomic absorption spectrometry, Fourier transform infrared spectroscopy (FT-IR), and proton nuclear magnetic resonance (1H-NMR). It was then used as a sorbent for selective magnetic solid phase extraction of zinc(II) ion. Using MIP as a suitable neutral carrier, a label modified carbon paste electrode (MCPEs) that is highly selective to Zn(II) ions was created. For MCPEs (Sensors I and II), they demonstrated a linear concentration range from 1.0x10-7 to 1.0x10-1 mol L-1 with Nernstian slopes of 28.43±0.63 and 29.27±0.48 mV decade-1, respectively. The suggested electrodes were successful applied in determining the Zn(II) ion concentrations in water samples. The outcomes were comparable to those from atomic absorption spectroscopy (AAS) in actual spiked water samples.


Main Subjects

Articles in Press, Accepted Manuscript
Available Online from 12 February 2024
  • Receive Date: 13 November 2023
  • Revise Date: 25 January 2024
  • Accept Date: 12 February 2024