Jump to main content
Jump to site search

Issue 8, 2006
Previous Article Next Article

Development of a direct current He atmospheric-pressure glow discharge as an ionization source for elemental mass spectrometryviahydride generation

Author affiliations

Abstract

A new direct-current glow discharge has been designed and interfaced with a time-of-flight mass spectrometer. This glow discharge is simple to operate, sustainable in a helium environment at atmospheric pressure at the 40–100 mA level with burning voltages of 0.9–1.2 kV, and capable of generating singly charged atomic ions observable by mass spectrometry. Because of its high first ionization potential (24.6 eV), the presence of He+ in background mass spectra suggests that a significant amount of energy is available for the ionization of gaseous analyte species. In addition, noise power spectra obtained from helium ions in an analyte-free discharge indicate that discrete-frequency noise sources are not present in the atmospheric-pressure glow discharge; only 1/f noise and white noise are found. When this detection system is coupled with hydride generation, the analytical performance of the hydride generation–atmospheric-pressure glow discharge system is comparable with that typically obtained with an inductively coupled plasma ionization source. Although the precision and sensitivity of this system are slightly poorer, the discharge spectrum is free from polyatomic background ions that could otherwise yield problematic isobaric interferences. In addition, a reduction in the overall continuum background enables limits of detection for three routinely-investigated hydride species (arsenic, selenium, and mercury) down to 10 ppt to be realized.

Graphical abstract: Development of a direct current He atmospheric-pressure glow discharge as an ionization source for elemental mass spectrometry via hydride generation

Back to tab navigation

Article information


Submitted
01 Jun 2006
Accepted
03 Jul 2006
First published
17 Jul 2006

J. Anal. At. Spectrom., 2006,21, 750-756
Article type
Paper

Development of a direct current He atmospheric-pressure glow discharge as an ionization source for elemental mass spectrometry via hydride generation

W. C. Wetzel, F. J. Andrade, J. A. C. Broekaert and G. M. Hieftje, J. Anal. At. Spectrom., 2006, 21, 750
DOI: 10.1039/B607781A

Social activity

Search articles by author

Spotlight

Advertisements