National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Speciation analysis of selected mercury compounds using combined technique HPCL-EcMCVG-QFAAS
Leštinová, Veronika ; Červený, Václav (advisor) ; Spěváčková, Věra (referee)
Today, the information about total mercury content in a sample is not enough to know because of different toxicity of various species like inorganic forms such as Hg+ , Hg+II and organic bonded mercury in Methyl-mercury, Ethyl-mercury or Phenyl-mercury. Therefore a speciation analysis is needed to do. The aim of this diploma thesis was to develop and validate a new method for speciation determination of selected mercury compounds. This method comprises a connection of high performance liquid chromatography, electrochemical mercury cold vapor generation as a postcolumn derivatization technique and atomic absorption spectrometer. Using this on-line connection of mentioned techniques, an efficient separation of Hg+II and methylmercury was achieved. Reached limits of detection were 0.3 µgml-1 and 0.5 µgml-1 for Hg+II and methylmercury, respectively. At the end of experimental work, proposed hyphenated technique HPLC- EcMCVG-QFAAS was used for determination of these two mercury compounds in six real tap water samples (Bílý potok, Bílina, Labe, Vltava, Botič, pond Kovošrot). In Bílý potok, inorganic mercury (Hg+II ) was identified on the base of identical of retention time compared to standard. Standard addition method was used in both FIA and HPLC arrangements and determined content of Hg+II was (0.4...
Chromatographic testing and comparison of reversed HPLC columns
Leštinová, Veronika ; Kubíčková, Anna (referee) ; Janečková, Lucie (advisor)
Simple chromatographic tests (Walters and Engelhardt) were used for determination of chromatographic characteristics of three modern reversed HPLC columns, which were consequently compared on the basis of hydrophobicity, silanol activity, efficiency and selectivity.

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