Gold volatile species atomization and preconcentration in quartz devices for atomic absorption spectrometry

0440563 - ÚIACH 2015 RIV NL eng J - Článek v odborném periodiku
Arslan, Y. - Musil, Stanislav - Matoušek, Tomáš - Kratzer, Jan - Dědina, Jiří
Gold volatile species atomization and preconcentration in quartz devices for atomic absorption spectrometry.
Spectrochimica Acta Part B: Atomic Spectroscopy. 103-104, JAN-FEB (2015), s. 155-163. ISSN 0584-8547. E-ISSN 1873-3565
Grant CEP: GA ČR GA14-23532S
Grant ostatní: GA AV ČR(CZ) M200311202
Institucionální podpora: RVO:68081715
Klíčová slova: gold * volatile species generation * quartz atomizers * atomic absorption spectrometry
Kód oboru RIV: CB - Analytická chemie, separace
Impakt faktor: 3.289, rok: 2015

The on-line atomization of gold volatile specieswas studied and the resultswere comparedwith thermodynamic calculations in several quartz atomizers, namely: diffusion flame, flame-in-gas-shield, flame-in-plain-tube, externally heated T-tube and externally heated flame-in-T-tube. Atomization mechanism in the explored devices is proposed, where volatile species are converted to thermodynamically stable AuH at elevated temperature over 500 °C and then atomized by an interaction with a cloud of hydrogen radicals. Because of its inherent simplicity and robustness, diffusion flame was employed as a reference atomizer. It yielded atomization efficiency of 70 to 100% and a very good long time reproducibility of peak area sensitivity: 1.6 to 1.8 s μg−1. Six and eleven times higher sensitivity, respectively, was provided by atomizers with longer light paths in the observation volume, i.e. externally heated T-tube and externally heated flame-in-T-tube. The latter one, offering limit of detection below0.01 μgml−1, appeared as the most prospective for on-line atomization. Insight into themechanismof atomization of gold volatile species, into the fate of free atoms and into subsequent analyte transfer allowed to assess possibilities of in-atomizer preconcentration of gold volatile species: it is unfeasible with quartz atomizers but a sapphire tube atomizer could be useful in this respect.
Trvalý link: http://hdl.handle.net/11104/0243674