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

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Fernandes, SMV (Author) Other; Lima, JLFC (Author) FFUP; Rangel, AOSS (Author) Other

Journal

Title: Fresenius' Journal of Analytical Chemistry

Vol. 366

Pages: 112-115

ISSN: 0937-0633

Publisher: Springer X

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 12 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4