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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Reduction of transport loses of volatile form of cadmium for determination by EcHG - in situ trapping - ETAAS
 Nováková, Eliška ; Rychlovský, Petr (advisor) ; Červený, Václav (referee)
This thesis deals with possible ways of improving sensitivity and repeatability of determination of cadmium by EcHG - ETAAS. The main complication of this coupled method is condensation of water vapors in the transport capillary, which takes part in the losses of the volatile form of cadmium. Possible solution or at least restriction of the above mentioned problem is heating of the transport route. Experiments also show that reducing the ratio area/volume of transport capillary doesn't lead to reduction of loses of the volatile form of cadmium.
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Contributions to Volatile Compound Generation of Arsenic, Silver and Gold by Tetrahydroborate Reaction for Atomic Absorption Spectrometry
 Musil, Stanislav ; Rychlovský, Petr (advisor) ; Kanický, Viktor (referee) ; Spěváčková, Věra (referee)
(EN) The presented dissertation thesis summarizes the results contained in five original research papers that were published in prestigious international scientific journals in the field of analytical chemistry and atomic spectrometry. It is devoted to the method of generation of volatile compounds using a tetrahydroborate reaction and detection in a quartz multiatomizer by atomic absorption spectrometry. The thesis can be divided into two thematic parts - speciation analysis of arsenic based on hydride generation technique with collection and separation in a cryogenic trap and generation of volatile species of transition metals. In the first thematic part pre-reduction of pentavalent inorganic and methylated arsenicals has been studied. A simple setup for on-line pre-reduction employing thioglycolic acid as a fast pre-reductant has been developed, connected with a current hydride generator and applied/verified to oxidation state specific arsenic speciation analysis of human urine samples. In the same method the possibility of drying the gaseous phase from water vapor has been investigated to avoid incidental blocking the cryogenic trap by frozen water and to decrease fluctuations of signal baseline. Pronounced losses of methylated species have been discovered on Nafion tube dryer currently used in...
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