期刊
FUEL
卷 103, 期 -, 页码 725-729出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2012.07.034
关键词
Fuel ethanol; Bioethanol; Methanol; Simultaneous determination; Fuel adulteration
资金
- CNPq [476667/2008-9, 305227/2010-6, 476269/2010-5]
- FAPEMIG [02276-09, 01430-11]
- CAPES
A new and simple strategy for the simultaneous determination of ethanol and methanol in fuel ethanol using cyclic voltammetry at a gold electrode is reported. A fuel ethanol aliquot was added into an electrochemical cell containing 0.5 mol L-1 NaOH and 0.1% (v/v) of methanol as the electrolyte and both analytes were determined using cyclic voltammetry. Ethanol was selectively detected at +0.19 V and both compounds were detected at +1.20 V. Current subtraction (using a correction factor) could be used for the selective determination of methanol. The limits of detection were estimated to be 0.028% and 0.045% (v/v) for ethanol and methanol, respectively. The proposed method presented similar results to those obtained by gas chromatography at a 95% confidence level. (C) 2012 Elsevier Ltd. All rights reserved.
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