Speciation of Arsenic Oxides Using Laser Desorption/Ionization Time-of-Flight Mass Spectrometry

Todd M. Allen, Dawit Z. Bezabeh, Catherine H. Smith, Eileen M. McCauley, A. Daniel Jones, Daniel P Y Chang, Ian M. Kennedy, Peter B. Kelly

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Abstract

Positive and negative ion mass spectra of arsenic trioxide (As2O3) and arsenic pentaoxide (As2O5) have been obtained by single-step laser desorption/ionization time-of-flight mass spectrometry. Pulsed UV radiation at 266 nm was used for the simultaneous desorption and ionization of the solid sample. High-mass cluster ions that are unique to the oxidation state of each oxide sample appear in the negative ion mass spectra. The As2O3 produces As3O5 -, while the As2O5 yields As3O8 -. The formation of unique negative cluster ions presents the capability for arsenic oxidation state speciation by laser desorption/ ionization mass spectrometry. The ability of time-of-flight mass spectrometry to examine the relative amounts of each arsenic oxide present in a series of mixtures is discussed. Application of our speciation technique to a model incinerator sample is demonstrated.

Original languageEnglish (US)
Pages (from-to)4052-4059
Number of pages8
JournalAnalytical Chemistry
Volume68
Issue number22
Publication statusPublished - Nov 15 1996

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ASJC Scopus subject areas

  • Analytical Chemistry

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Allen, T. M., Bezabeh, D. Z., Smith, C. H., McCauley, E. M., Jones, A. D., Chang, D. P. Y., ... Kelly, P. B. (1996). Speciation of Arsenic Oxides Using Laser Desorption/Ionization Time-of-Flight Mass Spectrometry. Analytical Chemistry, 68(22), 4052-4059.