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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/9980
Título: 
Stripping voltammetry of mercury(II) with a chemically modified carbon paste electrode containing silica gel functionalized with 2,5-dimercapto-1,3,4-thiadiazole
Autor(es): 
Instituição: 
Universidade Estadual Paulista (UNESP)
ISSN: 
1040-0397
Resumo: 
The accumulation voltammetry of mercury(II) was investigated at a carbon paste electrode chemically modified with silica gel functionalized with 2,5-dimercapto-1,3,4-thiadiazole (DTTPSG-CPE). The repetitive cyclic voltammogram of mercury(II) solution in the potential range -0.2 to +0.8 V (vs. Ag/AgCl), (0.02 mol L-1 KNO3; nu=20 mV s(-1)) show two peaks one at about 0.0 V and other at 0.31 V. However, the cathodic wave peak, around 0.0 V, is irregular and changes its form in each cycle. This peak at about 0.0 V is the reduction current for mercury(II) accumulated in the DTTPSG-CPE. The anodic wave peak at 0.31 V is well-defined and does not change during the cycles. The resultant material was characterized by cyclic and differential pulse anodic stripping voltammetry performed with the electrode in differents supporting electrolytes. The mercury response was evaluated with respect to pH, electrode composition, preconcentration time, mercury concentration, cleaning solution, possible interferences and other variables. The precision for six determinations (n=6) of 0.05 and 0.20 mg (L)-(1) Hg(II) was 2.8 and 2.2% (relative standard deviation), respectively. The method was satisfactory and used to determine the concentration of mercury(II) in natural waters contaminated by this metal.
Data de publicação: 
1-Set-2005
Citação: 
Electroanalysis. Weinheim: Wiley-v C H Verlag Gmbh, v. 17, n. 17, p. 1540-1546, 2005.
Duração: 
1540-1546
Publicador: 
Wiley-Blackwell
Palavras-chaves: 
  • silica
  • carbon paste electrodes
  • voltammetry
  • mercury preconcentration
Fonte: 
http://dx.doi.org/10.1002/elan.200403252
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/9980
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