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Orientador(es)
Resumo(s)
A sequential injection system for determination of sulfate in wines was developed. It was based
on the formation of BaSO4, measured turbidimetrically at 420 nm. As sample dilution and acidification
were required, both sample and acid were sent to a mixing chamber placed in a lateral port of the
selection valve; after thorough mixing, up to six aliquots could be drawn and analyzed. A linear
calibration curve was established using 10% v/v ethanol standards with concentrations between 300
and 1500 mg L-1 of K2SO4. The results obtained by the present methodology were statistically
comparable with those furnished by the reference procedure, with relative deviations < 3.5%. The
sample frequency was about 5 samples per h with relative standard deviations (RSD) < 10%.
Descrição
Palavras-chave
Sequential injection Mixing chamber Turbidimetry sulfate Wine
Contexto Educativo
Citação
SILVA, Helena R. ; SEGUNDO, Marcela A. ; RANGEL, António O. S. S. - Use of a Mixing Chamber for Sample Preparation and Multiple Collection in Sequential Injection Analysis: Determination of Sulfate in Wines. Journal of the Brazilian Chemical Society. ISSN 0103-5053. Vol. 14, n.º1 (2003), p. 59-64
Editora
Sociedade Brasileira de Química