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  • 1 State University of Campinas, FEC/UNICAMP P. O. Box 6021, 13083-852 Campinas, Brazil
  • | 2 Methodist University of Piracicaba, FEAU/UNIMEP Rodovia Sta.Bárbara/Iracemápolis km 1, 13450-000 Sta.Bárbara D'Oeste, Brazil
  • | 3 University of S?o Paulo, FCFRP/USP Avenida do Café s/n, 14040-903 Ribeir?o Preto, Brazil
  • | 4 Federal University of Rio de Janeiro, COPPE/UFRJ P.O. Box 68501, 21945-970 Rio de Janeiro, Brazil
  • | 5 University of S?o Paulo, CENA/USP P.O. Box 96, 13400-970 Piracicaba, Brazil
  • | 6 Methodist University of Piracicaba, FEAU/UNIMEP Rodovia Sta.Bárbara/Iracemápolis km 1, 13450-000 Sta.Bárbara D'Oeste, Brazil
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Summary  

In this study the concentrations of P, S, Cl, K, Ca, Mn, Fe, Zn and Br in twenty-nine brands of national and international beers were determined by synchrotron radiation total reflection X-ray fluorescence analysis (SR-TXRF). The results were compared with the limits established by the Brazilian legislation and the nutritional values established by National Agricultural Library (NAL, USA). The measurements were performed at the X-Ray Fluorescence Beamline at Brazilian National Synchrotron Light Laboratory, in Campinas, São Paulo, Brazil, using a polychromatic beam for excitation. A small volume of 5 ml of beers containing an internal standard used to correct geometry effects was analyzed without pretreatment. The measuring time was 100 seconds and the detection limits obtained varied from 1 mg . l-1 for Mn and Fe to 15 mg . l-1 for P.