Selected Ion Flow Tube Mass Spectrometry as a Tool to Understand Hydride Atomization and the Fate of Free Analyte Atoms in an Externally Heated Quartz Tube Atomizer

0562522 - ÚFCH JH 2023 RIV US eng J - Journal Article
Lacko, Michal - Dryahina, Kseniya - Španěl, Patrik - Kratzer, Jan - Matoušek, Tomáš - Dědina, Jiří
Selected Ion Flow Tube Mass Spectrometry as a Tool to Understand Hydride Atomization and the Fate of Free Analyte Atoms in an Externally Heated Quartz Tube Atomizer.
Analytical Chemistry. Roč. 94, č. 38 (2022), s. 13163-13170. ISSN 0003-2700. E-ISSN 1520-6882
R&D Projects: GA ČR(CZ) GA21-25486S
Institutional support: RVO:61388955 ; RVO:68081715
Keywords : DIELECTRIC BARRIER DISCHARGE * FREE SELENIUM ATOMS * ABSORPTION-SPECTROMETRY
OECD category: Physical chemistry; Analytical chemistry (UIACH-O)
Impact factor: 7.4, year: 2022
Method of publishing: Limited access

Hydride atomization and the fate of free analyte atoms in an externally heated quartz tube atomizer (QTA) were investigated employing selected ion flow tube mass spectrometry (SIFT-MS). SIFT-MS proved to be ideally suited to study water concentration in gases leaving the atomizer. This made it possible to quantify the oxygen ´´contaminant´´ flow rate to QTA as 0.04-0.05 mL min(-1). This is valid for typical conditions of hydride generation. Most significantly, studies of temperature influence on water concentration resulted in detailed insight into hydrogen radical-forming reactions between oxygen and hydrogen. Minimum QTA temperatures required to generate hydrogen radicals under a variety of different flow rates and compositions of the QTA atmosphere were found to be in the range between 585 and 800 degrees C. The ability of SIFT-MS to detect extremely low concentrations of arsane and selane was employed to quantify the fraction of As and Se removed from the QTA in the form of hydride in dependence on QTA temperature under typical conditions of hydride generation. It was found that free As atoms formed by atomization of arsane decay to different species than to arsane. In the case of selane under typical atomization conditions, the efficiency of the decay of free Se atoms to selane was between 50 and 100% in dependence on actual flow rates and compositions of the QTA atmosphere.
Permanent Link: https://hdl.handle.net/11104/0334843