Artigo Publicado em Periódico
Determinação espectrofotométrica de sulfato em álcool etílico combustível empregando dibromosulfonazo III
Fecha
2013Registro en:
0100-4042
v. 36, n. 6
Autor
Almeida, Jorge Santos de
Soares, Vitória Regina Bispo
Andrade, Camila J.
Silva, José Domingos S. da
Dantas, Alailson Falcão
Rocha, Gisele Olímpio da
Teixeira, Leonardo Sena Gomes
Almeida, Jorge Santos de
Soares, Vitória Regina Bispo
Andrade, Camila J.
Silva, José Domingos S. da
Dantas, Alailson Falcão
Rocha, Gisele Olímpio da
Teixeira, Leonardo Sena Gomes
Institución
Resumen
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.