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We have developed a highly sensitive and selective sensor for lead(II) ions. A glassy carbon electrode was modified with Fe3O4 nanospheres and multi-walled carbon nanotubes, and this material was characterized by scanning electron microscopy and X-ray diffraction. The electrode displays good electrochemical activity toward Pb(II) and gives anodic and cathodic peaks with potentials at −496 mV and −638 mV...
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