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Mercury in waste water
Paříková, Lucie ; Čelechovská, Olga (referee) ; Dočekalová, Hana (advisor)
In the time period from November to April of the academic year 2007/2008 presence of mercury and its forms was monitored in the waste waters of Faculty of Chemistry, VUT in Brno. The level of mercury was determined as total mercury with help of the atomic absorption spectrometry method and in available forms by diffusive gradient in thin film technique.
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Contamination of soil and sediment by hazardous metals
Pidima, Tomáš ; Komendová, Renata (referee) ; Doležalová Weissmannová, Helena (advisor)
This bachelor thesis deals with soil and sediments from the environmental perspective. For selected heavy metals – cadmium, lead and mercury are given information about their occurrence, characteristics and potential sources of environmental contamination. It is also mentioned legislation dealing with the topic. The limit concentrations in soil and sediments, determination methodology and principles of the most commonly used instrumental analytical methods for these elements are described.
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The content of mercury in sediments washed out from the Jordán reservoir
JAHODOVÁ, Jana
The aim of this study was to examine if the sediments were washed out from the Jordán reservoir due to the rupture of the temporary dam to the Tismenický brook and then to the Lužnice river. The aim of the work was to assess the degree of their contamination with mercury and the possible environmental risk as well. The detailed literature research focused on determination of mercury in sediments was conducted at first. Then, the characteristics of the analytical method serving for mercury determination using an AMA 254 spectrometer were calculated. After that, the contents of mercury in individual samples of sediments were determinedand the degree of the environmental contamination was evaluated. Analytical andecological aspects of this study were taken into account. The measurements were related to samples taken from eight sampling sites during the six months from November 2013 to June 2014. The sediments were taken from four depths. Localities upstream the reservoir contained very low content of mercury. Its concentration corresponded to the natural background observed in sediments (the natural occurrence of Hg in the environment). The higher concentrations of Hg were determined in samples taken from sampling sites downstream the reservoir. However,these values corresponded to the natural occurrence of this element as well. The increased mercury concentrations (1.0365 mg/kg ? 0.0398) were obtained for samples taken from the site lying close ahead of the confluence of the Tismenický brook and the Lužnice river. This value exceeded the legislative limit (regulation No. 13/1994 Sb. The higher concentrations of mercury were determined for samples taken from the Lužnice river downstream the confluence compared to samples taken upstream the confluence. It is due to the rupture of the temporary dam (in December 2012 and June 2013) that resulted in washing out the sediments from the Jordán reservoir. This ecological disaster led to the change in natural mercury occurrence in localities downstream the reservoir.
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Atomic absorption spectrometry
Dočekal, Bohumil
Atomic absorption spectrometry is one of the most useful methods applied in trace element analysis, particularly due to high sensitivity and due to relatively low investment and operational costs. This method enables to determine up to 60 elements, metals and metalloids, within a wide concentration range from ug.l-1 to tenth of g.l-1. The contribution deals with fundamental principles of the method and instrumentation, including light sources, optical systems and modern background correction techniques. It systematically describes flame and flameless atomization and sample introduction techniques. Basic analytical parameters of the method, detection power, sensitivity, dynamic working range, standardization approaches, methodology, quality control and assurance are also discussed.
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