Voltammetric determination of total iron in fuel ethanol using a 1,10 fenantroline/nafion carbon paste-modified electrode
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Data
2008-03-01
Autores
Mattos, Cleiton dos Santos [UNESP]
do Carmo, Devaney Ribeiro [UNESP]
de Oliveira, Marcelo Firmino
Stradiotto, Nelson Ramos [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Electrochemical Science Group
Resumo
This work presents a methodology for iron determination in fuel ethanol using a modified carbon paste electrode with 1.10 fenantroline/nafion. The electrochemical parameters were optimized for the proposed system and the voltammetric technique of square wave was employed for iron determination. An accumulation time of 5 minutes, such as a 100 mV of pulse magnitude (E(sw)) and frequency (f) of 25 Hz were used as optimized experimental conditions. The modified carbon paste electrode presented linear dependence of amperometric signal with iron concentration in a work range from 6.0x10(-6) until 2.0x10(-5) mol L(-1) of iron, exhibiting a linear correlation coefficient of 0.9884, a detection limit of 2.4 x10(-6) mol L(-1) (n = 3) and amperometric sensibility of 4.5x10(5) mu A/mol L(-1). Analytical curve method was used for iron determination at a commercial fuel sample. Flame atomic absorption spectroscopy was employed as comparative technique.
Descrição
Palavras-chave
iron, fuel ethanol, carbon paste electrode, 1,10 fenantroline, square wave voltammetry
Como citar
International Journal of Electrochemical Science. Belgrade: Electrochemical Science Group, v. 3, n. 3, p. 338-345, 2008.