Determinação espectrofotométrica de sulfato em álcool etílico combustível empregando dibromosulfonazo III
| Autor: | Jorge S. Almeida, Vitória R. B. Soares, Camila J. Andrade, José Domingos S. da Silva, Alaílson F. Dantas, Gisele O. da Rocha, Leonardo S. G. Teixeira |
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| Jazyk: | English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Química Nova, Vol 36, Iss 6, Pp 880-884 (2013) |
| Druh dokumentu: | article |
| ISSN: | 1678-7064 0100-4042 |
| DOI: | 10.1590/S0100-40422013000600024 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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