The county town named Hradec Králové is located in eastern Bohemia on the confluence of Elbe and Orlice rivers. It is situated in a flat area, with many green areas and the absence of heavy industry. The industrial activity is concentrated in small business - engineering, chemical, electrical and food processing industries. All these aspects of human activity may be associated with risk elements contamination of the environment. The town is characterised by the high traffic density; we can therefore also assume the presence of risk elements in the air and subsequently soil contamination in the proximity of these roads. The aim of the study was to analyze the level of contamination of soil and vegetation in the city caused by risk elements (As, Be, Cd, Co, Cr, Cu, Mo, Ni, Pb, V and Zn). According to sampling scheme, which involved 86 sampling points, there were taken samples of soils and aboveground parts selected plant species: dandelion (Taraxacum sect. Ruderalia) and doorweed (Polygonum aviculare) occurring at all the sampling points. These samples were analysed for the risk elements contents.
In most of cases the risk element levels did not exceed the maximum allowable limits for the content of elements in soil and plants given by Decree no. 13/1994 Coll. and Directive no. 2002/32/EC. In the case of soil, there were significantly higher values of potentially mobilizable contents measured for arsenic. But this was not reflected on the contents of this element in the vegetation when all results were below the detection limit of the analytical method. Rarely, the values exceeding the limits were observed in several soil samples in the case of lead and cadmium. While for lead no increased concentrations of this element in the vegetation was observed, the cadmium levels occurring in dandelion exceeded in several cases the limits for fodder crops. The ability of doorweed to accumulate the risk elements was lower compared to dandelion.
Linear regression analysis showed that there is no significant relationship between the element contents in the soil and vegetation and the distance from the road. It therefore appears that the contents of elements in the soil and vegetation are not affected by traffic. Due to the significant positive correlation of most elements (except Cd and Zn) in the soil can be estimated that the levels in the soil are given rather by the character of the subsoil. This speculation but would require more detailed geological and geochemical survey of the site.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:256827 |
| Date | January 2016 |
| Creators | Bartošová, Tereza |
| Contributors | Száková, Jiřina, Hejtmánková, Alena |
| Publisher | Česká zemědělská univerzita v Praze |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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