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Preconcentration and determination of mercury(II) at a chemically modified electrode containing 3-(2-thioimidazolyl)propyl silica gel
Universidade Estadual Paulista (UNESP)
  • 0910-6340
  • 1348-2246
A mercury-sensitive chemically modified graphite paste electrode was constructed by incorporating modified silica gel into a conventional graphite paste electrode. The functional group attached to the (3-chloropropyl) silica gel surface was 2-mercaptoimidazole, giving a new product denoted by 3-(2-thioimidazolyl)propyl silica gel, which is able to complex mercury ions. Mercury was chemically adsorbed on the modified graphite paste electrode containing 3-(2-thioimidazolyl)propyl silica (TIPSG GPE) by immersion in a Hg(II) solution, and the resultant surface was characterized by cyclic and differential pulse anodic stripping voltammetry. One cathodic peak at 0.1 V and other anodic peak at 0.34 V were observed on scanning the potential from -0.1 to 0.8 V (0.01 M KNO3; ν = 2.0 mV s-1 νs. Ag/AgCl). The anodic peak at 0.34 V show an excellent sensitivity for Hg(II) ions in the presence of several foreign ions. A calibration graph covering the concentration range from 0.02 to 2 mg L-1 was obtained. The detection limit was estimated to be 5 μg L-1. The precision for six determinations of 0.05 and 0.26 mg L-1 Hg(II) was 3.0 and 2.5% (relative standard deviation), respectively. The method can be used to determine the concentration of mercury(II) in natural waters contaminated by this metal. 2005 © The Japan Society for Analytical Chemistry.
Issue Date: 
Analytical Sciences, v. 21, n. 11, p. 1359-1363, 2005.
Time Duration: 
  • 2 imidazolidinethione
  • 2-mercaptoimidazole
  • cation
  • drug derivative
  • fresh water
  • graphite
  • imidazole derivative
  • mercaptoimidazole
  • mercury
  • sea water
  • silica gel
  • silicon dioxide
  • calibration
  • chemistry
  • electrochemistry
  • instrumentation
  • ion selective electrode
  • methodology
  • oxidation reduction reaction
  • pH
  • reproducibility
  • Calibration
  • Cations
  • Electrochemistry
  • Ethylenethiourea
  • Fresh Water
  • Graphite
  • Hydrogen-Ion Concentration
  • Imidazoles
  • Ion-Selective Electrodes
  • Mercury
  • Oxidation-Reduction
  • Reproducibility of Results
  • Seawater
  • Silicon Dioxide
Access Rights: 
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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