Voltammetric determination of free and total sulfur dioxide in beer

• Type: Article in International Scientific Journal
• Date: 2003

Authors

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

Journal

Title: Electroanalysis

Vol. 15 No. 2

Pages: 587-590

ISSN: 1040-0397

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 17 Citations

Scopus - 18 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4