The aim of this study was to investigate a potential impact of the old polychlorinated biphenyls (PCBs) dump on their occurrence in Bezdrevsky stream basin. Wastes, containing PCBs, were illegally stored in the area of ex-agrochemical factory in Lhenice village. Six localities were chosen for sampling by the method of integrative passive samplers SPMD, which provides more valuable information about contamination than commonly used grab samples. Passive samplers were exponated for 18 days in June 2017. The samples extraction was performed at the Laboratory of environmental chemistry and biochemistry (Faculty of fisheries and protection of waters), followed by clean up and preparation of these extracts for analysis with gas chromatograph coupled to tandem mass spectrometer (GC-MS/MS). Obtained data on PCBs amount in the samples were recalculated to their concentration in water. Concentration of seven indicator PCBs congeners (PCB 28 + 31, PCB 52, PCB 101, PCB 118, PCB 138, PCB 153 a PCB 180) was determined. These congeners are typical for technical PCBs mixtures which were produced in Czechoslovakia in the past. From their relative abundance, the potential source and an age of the contamination were estimated. Their total sum indicated significant exceedance of the limit only for the first locality, in the reservoir draining the dump area. There was found the concentration of 100 ng.l-1 of the 7 indicator PCBs sum. Concentrations at other localities complied with required limits and varied between hundredths to tenths of ng.l-1. In comparison with older data acquired from this area, the concentration at the first locality did not change, whereas PCBs concentration at the second and third locality downstream is currently lower than in past. Our data were compared to the latest data of PCBs concentrations in selected localities in CZ, which were received from Czech hydrometeorological intitute. From measured values can be stated, that the basin of Bezdrevsky stream and its fish pond system are not endangered by the presence of PCBs. Only two localities situated near the source of PCBs are comparable with localities in CZ which are influenced by the long term industry presence.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:376700 |
| Date | January 2018 |
| Creators | LET, Marek |
| 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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