Chromium speciation in aerosols by rapid single-particle mass spectrometry

Kenneth R. Neubauer, Murray V. Johnston, Anthony S. Wexler

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

On-line speciation of chromium in aerosol particles by rapid single-particle mass spectrometry is discussed. Aerosols are sampled directly into the mass spectrometer where individual particles are detected by light scattering from a continuous laser beam. The scatter pulse from each particle triggers an excimer laser which ablates the particle in flight. Ions produced from the ablation event are analyzed by time-of-flight mass spectrometry. The negative ion spectra of particles containing chromium are dominated by chromium oxide clusters. The energy distribution of these ions suggests that they are produced by complex bond formation and dissociation processes in the ablation plume. Since these processes are strongly affected by the particle composition, the distribution of cluster ions can give a unique signature of the chromium species that are present, including a qualitative assessment of the relative amounts of Cr(III) and Cr(VI). However, these processes are also influenced by experimental variables such as particle size, water content, laser irradiance, and the identities of impurity and/or counterions, which must be controlled or accounted for in an analysis.

Original languageEnglish (US)
Pages (from-to)77-87
Number of pages11
JournalInternational Journal of Mass Spectrometry and Ion Processes
Volume151
Issue number2-3
DOIs
StatePublished - Dec 15 1995
Externally publishedYes

Fingerprint

particle mass
Chromium
Aerosols
Particles (particulate matter)
Mass spectrometry
chromium
aerosols
mass spectroscopy
Ions
Ablation
Excimer lasers
Mass spectrometers
Light scattering
Water content
Laser beams
Laser pulses
Negative ions
ablation
Particle size
Impurities

Keywords

  • Chromium speciation
  • Laser desorption/ionization
  • Microparticle analysis

ASJC Scopus subject areas

  • Spectroscopy

Cite this

Chromium speciation in aerosols by rapid single-particle mass spectrometry. / Neubauer, Kenneth R.; Johnston, Murray V.; Wexler, Anthony S.

In: International Journal of Mass Spectrometry and Ion Processes, Vol. 151, No. 2-3, 15.12.1995, p. 77-87.

Research output: Contribution to journalArticle

Neubauer, Kenneth R. ; Johnston, Murray V. ; Wexler, Anthony S. / Chromium speciation in aerosols by rapid single-particle mass spectrometry. In: International Journal of Mass Spectrometry and Ion Processes. 1995 ; Vol. 151, No. 2-3. pp. 77-87.
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AB - On-line speciation of chromium in aerosol particles by rapid single-particle mass spectrometry is discussed. Aerosols are sampled directly into the mass spectrometer where individual particles are detected by light scattering from a continuous laser beam. The scatter pulse from each particle triggers an excimer laser which ablates the particle in flight. Ions produced from the ablation event are analyzed by time-of-flight mass spectrometry. The negative ion spectra of particles containing chromium are dominated by chromium oxide clusters. The energy distribution of these ions suggests that they are produced by complex bond formation and dissociation processes in the ablation plume. Since these processes are strongly affected by the particle composition, the distribution of cluster ions can give a unique signature of the chromium species that are present, including a qualitative assessment of the relative amounts of Cr(III) and Cr(VI). However, these processes are also influenced by experimental variables such as particle size, water content, laser irradiance, and the identities of impurity and/or counterions, which must be controlled or accounted for in an analysis.

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