Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Simultaneous Voltammetric Determination of Zn(II), Pb(II), Cu(II), and Hg(II) in Ethanol Fuel Using an Organofunctionalized Modified Graphite-Polyurethane Composite Disposable Screen-Printed Device

Texto completo
Autor(es):
Saciloto, Thalita R. [1] ; Cervini, Priscila [1] ; Cavalheiro, Eder T. G. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Electroanalysis; v. 26, n. 12, p. 2664-2676, DEC 2014.
Citações Web of Science: 12
Resumo

A disposable screen-printed device containing working, auxiliary, and reference electrodes is proposed for the simultaneous voltammetric determination of Zn(II), Pb(II), Cu(II), and Hg(II) in ethanol fuel. The working electrode was printed using an ink modified with 2-benzothiazole-2-thiol organofunctionalized SBA-15 silica, in order to increase sensitivity. The performance of this electrode was compared with that of bare and SBA-15-modified electrodes. After optimizing the experimental parameters, the device was applied in determination of the analytes in commercial ethanol fuel samples, using 0.10 mol L-1 KCl/ethanol ratios of 30 : 70 (v/v), with {[}H+]=10(-5) mol L-1. After 5 min of preconcentration at -1.3 V (vs. pseudo-Ag/AgCl), four well-resolved signals were obtained, enabling simultaneous determination of the four analytes using a differential pulse anodic stripping voltammetry (DPASV) procedure. The limits of detection were 0.30, 0.065, 0.030, and 0.046 mu mol L-1 for Zn(II), Pb(II), Cu(II), and Hg(II), respectively. The results of these analyses were in agreement with those obtained using graphite furnace atomic absorption spectroscopy (GFAAS) for Pb(II), Cu(II), and Hg(II), and high-resolution continuum source flame atomic absorption spectrometry (HR-CS-FAAS) for Zn2+, at a 95% confidence level. Analytes originally present in the samples could be detected, and the interference of some cations and anions was evaluated. (AU)

Processo FAPESP: 10/05913-6 - Desenvolvimento e aplicação de eletrodos impressos descartáveis à base de compósitos grafite e poliuretana
Beneficiário:Thalita Rocha Saciloto
Linha de fomento: Bolsas no Brasil - Doutorado Direto
Processo FAPESP: 10/11080-7 - Preparação e Aplicação de Eletrodos Compósitos à Base de Grafite e Polímeros: Modificação com Sílicas Organofuncionalizadas e Polímeros Molecularmente Impressos
Beneficiário:Éder Tadeu Gomes Cavalheiro
Linha de fomento: Auxílio à Pesquisa - Regular