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The chemistry of atmospheric deposition at selected locations of Zlin Region
Zádrapová, Dagmar ; Vach, Marek (advisor) ; Sychová, Petra (referee)
Atmospheric and environmental pollution caused by heavy metals is nowadays one of the major environmental topics. Even though some of the heavy metals represent important trace elements for most of the organisms, their danger lies particularly in their toxicity which occurs even with little concentrations of the element, as well as their ability of bioaccumulation in food chains (Braniš, 2011). The sources of heavy metals in the atmosphere have natural and anthropogenic origin, however most of the emissions originate from the anthropogenic ones. Contamination of the atmosphere has a global character. Starting back in the 1970s, there has been a continuous reduction of heavy metal emissions in Europe (Pacyna, 2007). According to ČHMÚ (2015), one of the most polluted areas in the Czech Republic is currently Ostrava/Karviná/Frýdek-Místek agglomeration.
The aim of this thesis is to analyse and assess the results of selected heavy metals (Cd, Cr, Cu, Ni, Pb, Zn) measurement in total atmospheric deposition, which had been collected at selected localities in Zlin Region. The localities were chosen based on an assumption that the building density can impact the composition of the atmospheric deposition and its potential contamination with heavy metals due to the presence of combustions from residential units. Bulk collectors were chosen for this research and they were continuously exposed at the localities and therefore apart from liquid vertical precipitation, the samples contained also a non-defined amount of dry deposition.
The results of the measurement did not firmly confirm the original hypothesis. Incidence of most of the metals (Cr, Cu, Ni, Zn) was only minor. An enormously high concentration of Cd and Pb occurred in one of the samples, but not repeatedly during next sampling period. This can be considered an extreme which happened because of a random cause.
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