Use of a mixing chamber for sample preparation and multiple collection in sequential injection analysis: Determination of sulfate in wines

• Tipo: Artigo em Revista Científica Internacional
• Data: 2003

Autores

Silva, HR (Autor) Outra; Segundo, MA (Autor) Outra; Rangel, AOSS (Autor) Outra

Revista

Título: Journal of the Brazilian Chemical Society

Vol. 14

Páginas: 59-64

ISSN: 0103-5053

Editora: Sociedade Brasileira de Quimica

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 10 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-000-K2H

Abstract (EN): 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%.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6