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Příspěvek k optimalizaci parametrů speciační analýzy As založené na selektivním generování hydridů v uspořádání přímého přenosu hydridů s detekcí atomovým absorpčním spektrometrem / Contribution to optimization of parameters of speciation analysis of As based on selective hydride generation in direct transfer mode and detection by atomic absorption spectrometry

The presented thesis deals with optimization of parameters speciation analysis based on a selective hydride generation in a direct transfer mode of hydrides and on-line atomization in an atomic absorption spectrometer. In the first part of the thesis processes during generation were investigated. Important indicator of a reactions taking place in a generator is volume of hydrogen (created by decomposition of NaBH4) which is subsequently introduced to the atomizer. In this part of the thesis a new approach to determine a flow rate of hydrogen delivered to the atomizator was developed. An influence of relevant paremeters of the atomizers and atomic absorption spectrometers on basic analytical characteristics of arsenic determination based on hydride generation was performed in the second part. Three atomic absorption spectrometers were used and three sources of radiation were compared. The most important analytic characteristic was the limit of detection which is influenced by standard deviation of measurement values of blank samples and by sensitivity. The best values of the limit of detection were achieved with electrodeless discharge lamps. Key words: hydride generation, arsenic, speciation analysis, atomic absorption spectrometry

Identiferoai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:324212
Date January 2013
CreatorsVyvadilová, Tereza
ContributorsDědina, Jiří, Korunová, Vlasta
Source SetsCzech ETDs
LanguageCzech
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/masterThesis
Rightsinfo:eu-repo/semantics/restrictedAccess

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