Journal of Solid State Electrochemistry

, Volume 16, Issue 5, pp 1953–1963

Chemically functionalized glassy carbon spheres: a new covalent bulk modified composite electrode for the simultaneous determination of lead and cadmium


  • Gunigollahalli Kempegowda Raghu
    • Department of Studies in ChemistryBangalore University
  • Srinivasan Sampath
    • Department of Inorganic and Physical ChemistryIndian Institute of Science
    • Department of Studies in ChemistryBangalore University
Original Paper

DOI: 10.1007/s10008-011-1595-1

Cite this article as:
Raghu, G.K., Sampath, S. & Pandurangappa, M. J Solid State Electrochem (2012) 16: 1953. doi:10.1007/s10008-011-1595-1


A new type of covalent bulk modified glassy carbon composite electrode has been fabricated and utilized in the simultaneous determination of lead and cadmium ions in aqueous medium. The covalent bulk modification was achieved by the chemical reduction of 2-hydroxybenzoic acid diazonium tetrafluroborate in the presence of hypophosphorous acid as a chemical reducing agent. The covalent attachment of the modifier molecule was examined by studying Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and the surface morphology was examined by scanning electron microscopy images. The electrochemistry of modified glassy carbon spheres was studied by its cyclic voltammetry to decipher the complexing ability of the modifier molecules towards Pb2+ and Cd2+ ions. The developed sensor showed a linear response in the concentration range 1–10 μM with a detection limit of 0.18 and 0.20 μM for lead and cadmium, respectively. The applicability of the proposed sensor has been checked by measuring the lead and cadmium levels quantitatively from sewage water and battery effluent samples.


Glassy carbon spheres2-Hydroxybenzoic acid diazonium tetrafluroborateCovalent modificationStripping voltammetryLead and cadmium

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© Springer-Verlag 2011