A novel electrochemical sensor based on Co3O4-CeO2-ZnO multi metal oxide nanocomposite for simultaneous detection of nanomolar Pb2+ and Hg2+ in different kind of spices

Davoudi, Shahnaz ; Givianrad, Mohammad Hadi ; Saber-Tehrani, Mohammad ; Aberoomand Azar, Parviz

Abstract

Simultaneous and individual determination of Pb2+ and Hg2+ ions were carried out based on the synergistic effect of Co3O4, CeO2 and ZnO nanoparticles into the carbon paste electrode. The morphology of synthesized nanocomposite (Co3O4-CeO2-ZnO) was investigated by Scanning Electron Microscope, Transmission Electron Microscope, X-ray diffraction and Fourier Transform Infrared spectroscopy. The voltammetric current has increased linearly by increasing the concentration of Pb2+ and Hg2+ ions. The linear ranges of the Co3O4-CeO2-ZnO/CPE sensor were obtained 0.27-18.42 (for Pb2+ ions) and 0.42-31.30 nM (for Hg2+ ions), under optimum condition. The detection limits (3Sb/m) were obtained 0.054 nM for Pb2+ and 0.097 nM for Hg2+, respectively. The proposed electrochemical sensor acts as a sensitive and selective method for simultaneous determination of two heavy metal ions and shows excellent repeatability, reproducibility, and stability, with relative standard deviation (RSD) less than 3%. Finally, Co3O4-CeO2-ZnO/CPE was successfully applied for the determination of Pb2+ and Hg2+ in different kind of spices.

Keyword(s)

Electrochemical determination; modified electrode; Co3O4-CeO2-ZnO; Multi-metal oxide; Pb2+; Hg2+

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