Zobrazeno 1 - 5
of 5
pro vyhledávání: '"Vitória R. B. Soares"'
Publikováno v:
Química Nova, Vol 38, Iss 7, Pp 992-994 (2015)
AbstractA device comprising a lab-made chamber with mechanical stirring and computer-controlled solenoid valves is proposed for the mechanization of liquid-liquid extractions. The performance was demonstrated by the extraction of ethanol from biodies
Externí odkaz:
https://doaj.org/article/9dbc75b6c26745caaaaf9a23b66417c6
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
Publikováno v:
Química Nova, Vol 36, Iss 6, Pp 880-884 (2013)
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 absorbanc
Externí odkaz:
https://doaj.org/article/4aa0c82f0aaf455d9197c602b1d97453
Publikováno v:
Analytical Letters. 46:1621-1639
Automotive fuels require strict quality control to assure best energy use with minimal environmental pollution. Fuels can be modified before consumption by inadequate transport, storage, and handling, as well as illegal adulteration. Continuous monit
Autor:
Fábio Santos de Oliveira, Vitória R. B. Soares, Leonardo S. G. Teixeira, Luciano Hocevar, Maria das Graças Andrade Korn
Publikováno v:
Journal of the American Oil Chemists' Society. 89:781-786
Mid-infrared spectroscopy, in association with multivariate chemometric techniques, was employed for pattern recognition and the determination of the composition of waste frying oils (WFO); data are presented in terms of the percentage of soybean oil
Publikováno v:
Microchimica Acta. 161:279-283
A flow system designed with solenoid micro-pumps is introduced for spectrophotometric determination of total tannins based on the Folin– Denis reaction. The procedure minimizes the main drawbacks related to the AOAC batch procedure, i.e. interferen