Stripping voltammetry of mercury(II) with a chemically modified carbon paste electrode containing silica gel functionalized with 2,5-dimercapto-1,3,4-thiadiazole

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorDias, N. L.-
Autor(es): dc.creatordo Carmo, D. R.-
Data de aceite: dc.date.accessioned2021-03-10T16:50:59Z-
Data de disponibilização: dc.date.available2021-03-10T16:50:59Z-
Data de envio: dc.date.issued2014-05-20-
Data de envio: dc.date.issued2014-05-20-
Data de envio: dc.date.issued2005-09-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1002/elan.200403252-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/9980-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/9980-
Descrição: dc.descriptionThe 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.-
Formato: dc.format1540-1546-
Idioma: dc.languageen-
Publicador: dc.publisherWiley-Blackwell-
Relação: dc.relationElectroanalysis-
Relação: dc.relation2.851-
Relação: dc.relation0,692-
Direitos: dc.rightsclosedAccess-
Palavras-chave: dc.subjectsilica-
Palavras-chave: dc.subjectcarbon paste electrodes-
Palavras-chave: dc.subjectvoltammetry-
Palavras-chave: dc.subjectmercury preconcentration-
Título: dc.titleStripping voltammetry of mercury(II) with a chemically modified carbon paste electrode containing silica gel functionalized with 2,5-dimercapto-1,3,4-thiadiazole-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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