the tof-acsm: a portable aerosol chemical speciation monitor with tofms detection
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ID: 193259
2013
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Abstract
We present a new instrument for monitoring aerosol composition, the
time-of-flight aerosol chemical speciation monitor
(ToF-ACSM), combining precision state-of-the-art
time-of-flight mass spectrometry with stability, reliability, and
easy handling, which are necessities for long-term monitoring
operations on the scale of months to years. Based on Aerodyne
aerosol mass spectrometer (AMS) technology, the ToF-ACSM provides
continuous online measurements of chemical composition and mass of
non-refractory submicron aerosol particles. In contrast to the
larger AMS, the compact-sized and lower-priced ToF-ACSM does not
feature particle sizing, similar to the widely-used quadrupole-ACSM
(Q-ACSM). Compared to the Q-ACSM, the ToF-ACSM features a better
mass resolution of M/ΔM = 600 and better detection
limits on the order of < 30 ng m−3 for a time
resolution of 30 min. With simple upgrades these limits can be
brought down by another factor of ~ 8. This allows for
operation at higher time resolutions and in low concentration
environments. The associated software packages (single packages for
integrated operation and calibration and analysis) provide a high
degree of automation and remote access, minimising the need for
trained personnel on site. Intercomparisons with Q-ACSM, C-ToF-AMS,
nephelometer and scanning mobility particle sizer (SMPS)
measurements, performed during a first long-term deployment (> 10
months) on the Jungfraujoch mountain ridge (3580 m a.s.l.) in the
Swiss Alps, agree quantitatively. Additionally, the mass resolution
of the ToF-ACSM is sufficient for basic mass defect resolved peak
fitting of the recorded spectra, providing a data stream not
accessible to the Q-ACSM. This allows for quantification of certain
hydrocarbon and oxygenated fragments (e.g. C3H7+ and
C2H3O+, both occurring at m/Q = 43 Th), as well as
improving inorganic/organic separation.
| Reference Key |
frhlich2013atmosphericthe
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|---|---|
| Authors | ;R. Fröhlich;M. J. Cubison;J. G. Slowik;N. Bukowiecki;A. S. H. Prévôt;U. Baltensperger;J. Schneider;J. R. Kimmel;M. Gonin;U. Rohner;D. R. Worsnop;J. T. Jayne |
| Journal | bioorganic & medicinal chemistry |
| Year | 2013 |
| DOI |
10.5194/amt-6-3225-2013
|
| URL | |
| Keywords |
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