Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 17, Issue 6, Pages 1543-1552Publisher
SPRINGER
DOI: 10.1007/s10008-013-2009-3
Keywords
Mercury; Diazonium; Glassy carbon; Voltammetry; Surface modification
Categories
Funding
- Hydronet Project
- Singapore National Research Foundation
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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 stripping 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 H-1-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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