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Anomalous occurences of arsenic in natural waters in the Czech Republic
Rodovská, Zuzana ; Drahota, Petr (advisor) ; Redlich, Aleš (referee)
This bachelor thesis reviews the data on the distribution of arsenic in surface and underground natural waters of the Czech Republic. In addition the thesis focuses on the occurrence of anomalous arsenic concentrations and tries to detect sources of arsenic contamination. Results of the thesis suggest high quality of the surface and groundwater in the Czech Republic with respect to arsenic. Its anomalous concentrations in the natural waters in Czech Republic have been rarely documented only in areas with strong anthropogenic impact and in areas affected by historical mining operations. Keywords: Arsenic, toxicity, contamination, surface water, groundwater, Czech Republic
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Formation of realgar at the Mokrsko
Rodovská, Zuzana ; Drahota, Petr (advisor) ; Filippi, Michal (referee)
Summary: Throughout the world there are many places with a high concentration of arsenic in water. In the Czech Republic is such a place the area of Mokrsko, where arsenic in groundwater reaches the values, which are well above recommended limits for drinking water. On the studied locality arsenic is bound to secondary minerals containing iron; however, in the reducing conditions of the fluvial sediments arsenic is bound to newly-formed realgar accumulations associated with organic matter. Aim of this diploma thesis was to characterize realgar from this locality and try to determine the way and conditions of its origin. For the purpose of research, realgar and pore- water have been sampled, using lysimeters and rhizon samplers. Specimen of realgar was characterized by numerous standard techniques (XRD, SEM, TEM, chemical and isotopic composition). Water samples have been analysed for As, F and S species. Analysis of realgar using XRD, SEM and TEM techniques confirmed the presence of nanocrystalline realgar, forming clusters and needle like aggregates. Domination of divalent iron and reduced form of As3+ (4,3-7,3 mg/L) in similar concentrations has been observed within the pore- water samples. The concentration of dissolved sulfide was very low (cca 30 µg/L), on the other hand, content of sulphate was always...
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Anomalous occurences of arsenic in natural waters in the Czech Republic
Rodovská, Zuzana ; Drahota, Petr (advisor) ; Redlich, Aleš (referee)
This bachelor thesis reviews the data on the distribution of arsenic in surface and underground natural waters of the Czech Republic. In addition the thesis focuses on the occurrence of anomalous arsenic concentrations and tries to detect sources of arsenic contamination. Results of the thesis suggest high quality of the surface and groundwater in the Czech Republic with respect to arsenic. Its anomalous concentrations in the natural waters in Czech Republic have been rarely documented only in areas with strong anthropogenic impact and in areas affected by historical mining operations. Keywords: Arsenic, toxicity, contamination, surface water, groundwater, Czech Republic
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