National Repository of Grey Literature 38 records found  beginprevious27 - 36next  jump to record: Search took 0.00 seconds. 
Determination of As2O3 in homeopathic products Arsenicum Album using atomic absorption spectrometry with hydride generation
Cmuntová, Kateřina ; Kratzer, Jan (referee) ; Červený, Václav (advisor)
This bachelor thesis is intent on As determination in various types of homeopathic remedy Arsenicum Album which are available in Czech Republic. The method selected for this determination is atomic absorption spectrometry with hydride generation. The content of As2O3 in recommended daily dose of homeopathic was confronted with toxicologically referred maximal dose and it was discussed if there is any risk of health damage by using Arsenicum Album.
Preconcentration of Hydride Forming Elements in Quartz Atomizers for Atomic Absorption Spectrometry
Kratzer, Jan ; Dědina, Jiří (advisor) ; Komárek, Josef (referee) ; Spěváčková, Věra (referee)
CHARLES UNIVERSITY IN PRAGUE FACULTY OF SCIENCE Department of Analytical Chemistry PRECONCENTRATION OF HYDRIDE FORMING ELEMENTS IN QUARTZ ATOMIZERS FOR ATOMIC ABSORPTION SPECTROMETRY Synopsis of the PhD Thesis Prague 2008 RNDr. Jan Kratzer 2 CONTENTS CONTENTS................................................................................................................... 2 CURRICULUM VITAE............................................................................................... 4 LIST OF PUBLICATIONS ......................................................................................... 6 ABSTRACT................................................................................................................... 9 1 ULTRATRACE ANALYSIS OF HYDRIDE FORMING ELEMENTS ....... 11 2 OBJECTIVES OF THE THESIS ...................................................................... 13 3 EXPERIMENTAL .............................................................................................. 15 3.1 Apparatus ....................................................................................................... 15 3.2 Procedure........................................................................................................ 16 3.3 Detection by atomic absorption spectrometry...
Concentration of atomic hydrogen measured in a heated atomizer by two-photon absorption laser-induced fluorescence
Dvořák, P. ; Talába, M. ; Dědina, Jiří ; Kratzer, Jan ; Obrusník, A.
Concentration of free hydrogen atoms was measured by the two-photon absorption laser-induced fluoresence (TALIF) in an externally heated atomizer in a mixture of argon, hydrogen and oxygen at atmospheric pressure. The atomic hydrogen concentration in the order 10^22 m^-3 was found in the region around the flame.
Extraction of selected mercury compounds for speciation analysis by RP-HPLC-UV-CVG-QTAAS
Kolorosová, A. ; Linhart, O. ; Kratzer, Jan ; Červený, V.
Extraction of selected mercury compounds (Hg+II, methylmercury, ethylmercury and phenylmercury) is studied using fish tissue samples. HPLC is employed for speciation, whereas UV-photochemical cold vapor generation coupled to atomic absorption is used for detection.
Gold chemical vapor generation by tetrahydroborate reduction for AAS: Radiotracer efficiency study and characterization of gold species
Musil, Stanislav ; Arslan, Y. ; Kratzer, Jan ; Vobecký, Miloslav ; Benada, Oldřich ; Matoušek, Tomáš ; Rychlovský, P. ; Ataman, O. Y. ; Dědina, Jiří
The main objective was to assess the generation efficiency in the optimized method of chemical vapor generation of gold by means of 198,199Au radioindicator. We also intended to characterize the volatile Au species formed by tetrahydroborate reduction.
Chemické generování těkavých sloučenin stříbra pro potřeby AAS: studie účinnosti transportu pomocí radioizotopu .sup.111./sup.Ag a in-situ kolekce na křemenném povrchu
Musil, Stanislav ; Kratzer, Jan ; Vobecký, Miloslav ; Matoušek, Tomáš
The method of chemical vapour generation of silver by means of sodium tetrahydroborate was futher developed in order to minimize transport losses. The possibility of collection of volatile silver species directly in the atomizer is presented.
Kryogenní záchyt arsenu pro speciační analýzu arsenu technikou hydridového generování s detekcí atomovou absorpční spektrometrií
Svoboda, Milan ; Kratzer, Jan ; Vobecký, Miloslav ; Rychlovský, P. ; Dědina, Jiří
The general aim of this work was to contribute to further improvement of the method for complete speciation analysis of trivalent and pentavalent human metabolites of arsenic in complex biological matrices. The main target of this work was to investigate processes during the cryotrapping procedure and find optimum conditions.
Chemické generování těkavých forem stříbra jako metoda vnášení vzorku pro atomovou absorpční spektrometrii
Musil, Stanislav ; Kratzer, Jan ; Vobecký, Miloslav ; Rychlovský, P. ; Matoušek, Tomáš
A method of silver chemical vapour generation as a sample introduction technique for analytical atomic spectrometry is presented. Optimization of reaction and atomization parametrs was carried out and the efficiency of the chemical vapour generation was studied by means of radiotracer experiments.
Záchyt hydridů As a Se na křemenném povrchu - krok směrem k in-situ prekoncentraci v křemenných atomizátorech s detekcí AAS
Kratzer, Jan ; Dědina, Jiří ; Rychlovský, P.
An optimization study of arsine and selenum hydride preconcentration at the quartz surface is presented. A novel apparatus design consisting of a quartz trap integrated with a quartz multiatomizer is described.

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2 Kratzer, J.
6 Krätzer, Jan
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