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Sensor de pasta de nanotubos de carbono modificado com filme de bismuto para determinação de íons metálicos em etanol combustível

2015; UNIVERSIDADE ESTADUAL DE LONDRINA; Volume: 36; Issue: 1 Linguagem: Inglês

10.5433/1679-0375.2015v36n1p41

ISSN

1679-0375

Autores

Felipe Augusto Gorla, Fernanda Midori de Oliveira, Eduardo Henrique Duarte, Ana E. P. De Mattos, Elisângela Tavares da Silva, Olívio Fernandes Galão, Dionísio Borsato, Mariana Gava Segatelli, César Ricardo Teixeira Tarley,

Tópico(s)

Electrochemical sensors and biosensors

Resumo

In the present study an anodic stripping voltammetric method using a bismuth film modified carbon nanotubes paste electrode for simultaneous determination of metals Zn2+, Cd2+and Pb2+in ethanol fuel is described. The metallic ions were preconcentrated on the bismuth film in the time and deposition potential of 500 s and -1.2 V and the stripping step was carried out by square wave voltammetry (frequency of 15 Hz, pulse amplitude of 25 mV and potential step of 5 mV). Acetate buffer at 0.1 mol L-1concentration and pH 4.5 was used as support electrolyte. The method showed linearity including the analytical blank up to 48.39 ?g L-1 for the metals and the obtained limits of detection were 3.36, 0.32 and 0.47 ?g L-1for Zn2+, Cd2+and Pb2+, respectively. The proposed method was applied in ethanol fuel samples.

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