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Química Nova

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ALMEIDA, Jorge S. et al. Spectrophotometric determination of sulphate in ethanol fuel using dibromosulphonazo III. Quím. Nova [online]. 2013, vol.36, n.6, pp.880-884. ISSN 0100-4042.

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.

Keywords : sulphate; ethanol fuel; spectrophotometry.

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