Abstract
Electrochemical determination of Hg(II) in aquatic solutions on bare and modified glassy carbon electrode (GCE) is reported. Optimizing the parameters used for a bare GCE, such as the electrolyte solution, the potential and time of deposition, resulted in linear response over a large range of Hg(II) concentrations (4–160 ppb) using linear sweep anodic strip** voltammetry. Modification of the electrode with 4,4′-disulfanediyldibenzenediazonium (DSBD) yielded a lowest detection limit of 1 ppb. Two procedures for DSBD synthesis are described for the first time, and the product was characterized by microanalysis, FTIR and 1H-NMR. The electrochemical attachment of DSBD to the electrode was studied and compared with the electrochemical behaviour of DSBD analogous molecules, i.e. 4-aminophenyl disulfide, p-aminothiophenol and phenyl disulfide.
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This work was supported by the Hydronet Project (http://www.hydronet-project.eu) and partially by the Singapore National Research Foundation under CREATE programme: “Nanomaterials for Energy and Water Management”.
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Shahar, T., Tal, N. & Mandler, D. The synthesis and characterization of thiol-based aryl diazonium modified glassy carbon electrode for the voltammetric determination of low levels of Hg(II). J Solid State Electrochem 17, 1543–1552 (2013). https://doi.org/10.1007/s10008-013-2009-3
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DOI: https://doi.org/10.1007/s10008-013-2009-3