Five types of red wine produced from the grape varieties from the Metohia region (vintage 2014) were characterized on the basis of their chromatic properties. The properties of bottled wines: Merlot, Vranac, Prokupac, Cabernet and Game were analyzed. Chromatic characteristics of these wines were observed four times during the year-spectrophotometer measurements were performed on wines aged 0, 4, 8 and 12 months. Intensity, hue and brilliance of color of these wines were determined (by the usual method of Glories). The amount of coloring matter was determined by the usual method of Durmishidze and the percentage of polymeric anthocyanins was calculated as well. Wine ageing decreased the color intensity while the color hue value increased. It was also found that contribution of wine color red pigment decreased with wine ageing, while the percentage of yellow pigment in wine increased. The total amount of colored substances in wines studied decreased with wine ageing, while the percentage of polymeric pigments in wine increased. This study presents the methodology for analyses of the chromatic characteristics, and explains the origin influence of wine on these properties. On the basis of these correlations the quality of red wine can be established.
This study is focused on mechanisms of voltammperometric determination of lead, cadmium and zinc in the natural grassland biomass in territory of northern Kosovo, applying the Stripping analysis. Two types of determinations have been researched: individual and simultaneous research of all three metals. The preliminary researches had been conducted prior determinations on real samples defining the determination conditions: extraction potential, value of analyzed pH solution, metal extraction time, time for creating of working electrode, as well as solution mixing velocity. It was found that, with accuracy of ±2%, determinations were done for 22-900 µg dm-3 of lead, 16-960 µg dm-3 of cadmium and 18-750 µg dm-3 of zinc. The simultaneous metal determinations had less accurate results for lead and cadmium, whereas they ranged within accuracy limits for zinc. Heavy metal determination in biomass indicated existence of lead, cadmium and zinc in natural grasslands in northern parts of Kosovo and Metohija.
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