Determinação espectrofotométrica de sulfato em álcool etílico combustível empregando dibromosulfonazo III

Química Nova

Jorge S. Almeida¹  Vitória R. B. Soares¹  Camila J. Andrade¹  José Domingos S. Da Silva¹  Alaílson F. Dantas¹  Gisele O. Da Rocha¹  Leonardo S. G. Teixeira¹ 

[1] ,Universidade Federal da Bahia Instituto de Química Salvador BA ,Brasil

关键词: sulphate;    ethanol fuel;    spectrophotometry;   

DOI  :  10.1590/S0100-40422013000600024

来源: SciELO

【 摘 要 】

A sensitive spectrophotometric method was developed for sulphate determination in automotive ethanol fuel. The method based on the reaction of the analyte with barium-dibromosulphonazo(III) complex lead to a decrease in the magnitude of the absorbance signals monitored at 649 nm. No sample pretreatment is required and the proposed method allows sulphate determination in the 0.45 - 6.50 mg L-1 range with R.S.D. < 2% and limit of detection of 0.14 mg L-1. The method has been successfully applied for sulphate determination in automotive ethanol fuel and the results agreed with the reference chromatographic method.

【 授权许可】

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