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https://repositorio.ufba.br/handle/ri/12837
metadata.dc.type: | Artigo de Periódico |
Título : | Spectrophotometric determination of sulphate in automotive fuel ethanol by sequential injection analysis using dimethylsulphonazo(III) reaction |
Otros títulos : | Talanta |
Autor : | Oliveira, Fábio Santos de Korn, Mauro |
metadata.dc.creator: | Oliveira, Fábio Santos de Korn, Mauro |
Resumen : | 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. |
Palabras clave : | Sulphate determination Automotive fuel ethanol SIA Ethanol combustion |
URI : | http://www.repositorio.ufba.br/ri/handle/ri/12837 |
Fecha de publicación : | 2006 |
Aparece en las colecciones: | Artigo Publicado em Periódico (Química) |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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1-s2.0-S003991400500408X-main.pdf Restricted Access | 184,25 kB | Adobe PDF | Visualizar/Abrir Request a copy |
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