| الوصف: |
Kovine v pivu imajo velik vpliv na kvaliteto, okus ter izgled piva prav tako pa na potek alkoholne fermentacije. V 6 različnih vzorcih piva sem določal vsebnost izbranih kovin (baker, železo, mangan in cink). Vzorce sem pripravil tako, da sem jih prefiltriral oz. pripravil samo s kislinskim mikrovalovnim razklopom. Kovine imajo v pivu vsebnost na ravni sledov, zato klasične metode niso primerne za uporabo. Koncentracije sem zato določal z atomsko absorpcijsko in optično emisijsko spektroskopijo s pomočjo umeritvene krivulje. ICP-OES nam za razliko od AAS omogoča, da naenkrat določamo več elementov v vzorcu. Vsebnosti kovin v vzorcih sem primerjal z rezultati drugih raziskav, poleg tega pa sem primerjal tudi razlikovanje rezultatov pri obeh uporabljenih metodah. Metals in beer have a big influence on quality, taste and looks of the beer, and also on the process of fermentation. Therefore, I determined the contents of selected metals in 6 different samples of beer (copper, iron, manganese, zinc). The samples were prepared by filtering or by acid microwave digestion. The metals in beer are present in traces, consequently classical methods are not suitable for use. The concentrations were determined by atomic absorption and optical emission spectroscopy with the use of calibration curve. On the contrary to AAS, ICP-OES allows us to measure more elements in a sample at once. Contents of metals in the samples were compared to results of other researches. In addition, also difference of results in both methods was compared. |
