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metadata.dc.type: Artigo de Periódico
Title: Spectrophotometric determination of sulphate in automotive fuel ethanol by sequential injection analysis using dimethylsulphonazo(III) reaction
Other Titles: Talanta
Authors: Oliveira, Fábio Santos de
Korn, Mauro
metadata.dc.creator: Oliveira, Fábio Santos de
Korn, Mauro
Abstract: A sensitive SIA method was developed for sulphate determination in automotive fuel ethanol. This method was based on the reaction of sulphate with barium–dimethylsulphonazo(III) leading to a decrease on the magnitude of analytical signal monitored at 665 nm. Alcohol fuel samples were previously burned up to avoid matrix effects for sulphate determinations. Binary sampling and stop-flow strategies were used to increase the sensitivity of the method. The optimization of analytical parameter was performed by response surface method using Box–Behnker and central composite designs. The proposed sequential flow procedure permits to determine up to 10.0 mg SO42− l−1 with R.S.D. <2.5% and limit of detection of 0.27 mg l−1. The method has been successfully applied for sulphate determination in automotive fuel alcohol and the results agreed with the reference volumetric method. In the optimized condition the SIA system carried out 27 samples per hour.
Keywords: Sulphate determination
Automotive fuel ethanol
Ethanol combustion
Issue Date: 2006
Appears in Collections:Artigo Publicado em Periódico (Química)

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