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Voltammetric Determination of Total Iron in Fuel Ethanol Using a 1,10 Fenantroline/Nafion Carbon Paste-Modified Electrode

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Author(s): Cleiton dos Santos Mattos, Devaney Ribeiro do Carmo, Marcelo Firmino de Oliveira and Nelson Ramos Stradiotto

Journal: International Journal of Electrochemical Science
ISSN 1452-3981

Volume: 3;
Issue: 3;
Start page: 338;
Date: 2008;
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Keywords: iron | fuel ethanol | carbon paste electrode | 1 | 10 fenantroline | square wave voltammetry

ABSTRACT
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 (Esw) 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 4.5x105 mA/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.
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