Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Selenium preconcentration in a gold “amalgamator” after hydride generation for atomic spectrometry

Author affiliations

Abstract

A gold amalgamator, used conventionally for Hg vapor enrichment, is reported to preconcentrate Se after hydride generation. The optimum trapping and volatilization temperatures were 450 and 970 °C, respectively. Preconcentration processes are controlled by temperature only while the carrier gas composition remains unchanged (75 ml min−1 H2). This is a significant advantage compared to the approach reported previously based on gold wire, where Se preconcentration was controlled by both surface temperature and carrier gas composition. Moreover, the gold amalgamator offers higher capacity and better resistance to interference, at least by an order of magnitude. This approach to Se preconcentration is very well compatible with atomic absorption spectrometry using a modular trap-and-atomizer device reported recently. The limit of detection for 300 s sample introduction time reached 13 pg ml−1 Se (absolute LOD 247 pg Se). The method developed was validated by analysis of water certified reference materials. The mechanism of selenium hydride trapping was investigated employing a 75Se radioactive indicator. The potential of coupling the gold amalgamator trap to an inductively coupled plasma mass spectrometer was also investigated. However, severe transport losses of volatilized Se species occur between the heated amalgamator and the torch due to analyte condensation on colder surfaces, preventing routine use of this set-up.

Graphical abstract: Selenium preconcentration in a gold “amalgamator” after hydride generation for atomic spectrometry

Back to tab navigation

Supplementary files

Article information


Submitted
12 May 2020
Accepted
05 Jun 2020
First published
05 Jun 2020

J. Anal. At. Spectrom., 2020, Advance Article
Article type
Technical Note

Selenium preconcentration in a gold “amalgamator” after hydride generation for atomic spectrometry

A. Fernandes de Oliveira, M. Svoboda, S. Musil, I. Machado, D. Vaněk, T. Matoušek, J. Dědina and J. Kratzer, J. Anal. At. Spectrom., 2020, Advance Article , DOI: 10.1039/D0JA00227E

Social activity

Search articles by author

Spotlight

Advertisements