Spectrophotometric flow injection determination of total phosphorus in beer using on-line UV/thermal induced digestion

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

Fernandes, SMV (Autor) Outra; Lima, JLFC (Autor) FFUP; Rangel, AOSS (Autor) Outra

Revista

Título: Fresenius' Journal of Analytical Chemistry

Vol. 366

Páginas: 112-115

ISSN: 0937-0633

Editora: Springer

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 12 Citações

Outras Informações

ID Authenticus: P-001-1HG

DOI: 10.1007/s002160050020

Abstract (EN): A flow injection system for the automatic determination of total phosphorus in beer is described. The developed manifold uses a two-stage photooxidation/thermal digestion procedure together with oxidizing and hydrolyzing reagents to convert all forms of phosphorus compounds to orthophosphate. Polyphosphates are hydrolyzed by acid and heat, and organo-phosphates are digested by UV-catalyzed peroxodisulfate oxidation. The orthophosphate formed is then spectrophotometrically determined by the phosphomolybdenum blue reaction, using stannous chloride as reducing agent. The results obtained for a set of 19 beer samples (with concentrations from 120 to 735 mg P/L) were in good agreement with the reference method, the maximum relative deviation found being 4.7%. Relative standard deviations for ten consecutive determinations were lower than 1.5%, and a detection limit of 1 mg P/L was achieved.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4