title: Fast batch injection analysis system for on-site determination of ethanol in gasohol and fuel ethanol.
abstract: A simple, accurate and fast (180 injections h(-1)) batch injection analysis (BIA) system with multiple-pulse amperometric detection has been developed for selective determination of ethanol in gasohol and fuel ethanol. A sample aliquot (100 μL) was directly injected onto a gold electrode immersed in 0.5 mol L(-1) NaOH solution (unique reagent). The proposed BIA method requires minimal sample manipulation and can be easily used for on-site analysis. The results obtained with the BIA method were compared to those obtained by gas-chromatography and similar results were obtained (at 95% of confidence level).
authors.affiliation: Instituto de Química - Universidade Federal de Uberlândia, Av. João Naves de Ávila, 2121 Uberlândia, MG, Brazil.
authors.forename: Polyana F
authors.initials: PF
authors.lastname: Pereira
authors.forename: Mariana C
authors.initials: MC
authors.lastname: Marra
authors.forename: Rodrigo A A
authors.initials: RA
authors.lastname: Munoz
authors.forename: Eduardo M
authors.initials: EM
authors.lastname: Richter
mesh_terms: D056804:Biofuels / Q000032:analysis*; D055664:Electrochemical Techniques; D004566:Electrodes; D000431:Ethanol / Q000032:analysis*; D017022:Flow Injection Analysis / Q000295:instrumentation / Q000379:methods*; D005742:Gasoline / Q000032:analysis*; D006046:Gold / Q000737:chemistry*
chemical_list: D056804:Biofuels; D005742:Gasoline; D000431:Ethanol; D006046:Gold