Voltammetric determination of free and total sulfur dioxide in beer

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

Autores

Almeida, PJ (Autor) FCUP; Rodrigues, JA (Autor) FCUP; Guido, LF (Autor) FCUP; Santos, JR (Autor) FCUP; Barros, AA (Autor) FCUP; Fogg, AG (Autor) Outra

Revista

Título: Electroanalysis

Vol. 15 Nº 2

Páginas: 587-590

ISSN: 1040-0397

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 17 Citações

Scopus - 18 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-000-H5B

DOI: 10.1002/elan.200390073

Abstract (EN): A voltammetric method for the determination of free and total sulfur dioxide in beer is described. First, volatile aldehydes (mainly acetaldehyde) are purged with nitrogen from a beer sample diluted in alkaline medium, collected in an appropriate electrolyte trapping solution and determined, after derivatization with hydrazine, by voltammetry using a hanging mercury drop electrode. Then, the remaining beer solution is strongly acidified and (total) sulfur dioxide is purged with nitrogen, collected in an appropriate electrolyte trapping solution and determined by voltammetry. The free sulfur dioxide concentration is calculated by difference between (total) sulfur dioxide and acetaldehyde concentrations. The proposed method has a relative standard deviation of about 2.1% and 4.4%, respectively for (total) sulfur dioxide and free sulfur dioxide concentrations normally found in beer, and results are in good agreement with those obtained by the p-rosaniline reference method.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4