Análise química da cerveja 2M em termos dos teores de Ca, Cu, Fe, K, Mg, Na, e Zn e verificação da contribuição dos teores destes elementos a partir da água e do malte

Abstract

In the present work, the elements Ca, Cu, Fe, Mg, Na, K and Zn were determined in 4 samples, one of water, one of malt and two of 2M beer, collected in the month of November 2009 at Cervejas de Moçambique (CDM). The elements Ca, Cu, Fe, Mg and Zn were determined by spectrophotometry of Atomic Absorption with Flame Atomization (FAAS), while K and Na were determined by Flame Photometry (FC). Fe was also determined by Molecular Absorption Spectrophotometry (EAM).

One of the objectives was to determine all the elements using two methods, which was possible for the remaining elements due to lack of reagents and the breakdown of gadgets. The accuracy of the methods was good with% RSD ranging from 0 to 16.2%. The average levels of metals determined in this work were 130mg / L for Ca, 27.8mg / L for Mg, 0.54mg / L for Fe *, 0.07mg / L for Fe #, 0.59mg / L for Zn, 0.7mg / L for Cu, 0.95mg / L for K, 28.2mg / L for Na in the water sample. In the malt sample, they were 153mg / g for Ca, 94.6mg / g for Mg, 15.5mg / g for Fe *, 17.1mg / g for Fe #, 2.71mg / g for Zn, 0.42mg / g for Cu, 664mg / g for Cu K, 1.58mg / g for Na. In the 2 beer samples, they vary from 12.2 to 12.5mg / L for Ca, 10.2 to 10.3mg / L for Ca Mg, 3.30 to 3.31mg / L for Fe *, 3.06mg / L in both samples for Fe #, 0.71 to 0.76mg / L for Zn, 0.18 to 0.22mg / L for Cu, 190 to 202mg / L for K, 28.6 to 31.6mg / L for Na. The above results were monitored using reference material, water from the LGC6019 from the United Kingdom, which can can serve to validate the results of the water, not serving for the results of malt and beer and these can be taken as information data.