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Particle Detection Efficiencies of Aerosol Time of Flight Mass Spectrometers under Ambient Sampling Conditions

Allen, Jonathan O. and Fergenson, David P. and Gard, Eric E. and Hughes, Lara S. and Morrical, Bradley D. and Kleeman, Michael J. and Gross, Deborah S. and Gälli, Markus E. and Prather, Kimberly A. and Cass, Glen R. (2000) Particle Detection Efficiencies of Aerosol Time of Flight Mass Spectrometers under Ambient Sampling Conditions. Environmental Science and Technology, 34 (1). pp. 211-217. ISSN 0013-936X. doi:10.1021/es9904179.

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Aerosol time-of-flight mass spectrometers (ATOFMS) measure the size and chemical composition of single aerosol particles. To date, these instruments have provided qualitative descriptions of aerosols, in part because the fraction of particles actually present in the atmosphere that is detected by these instruments has not been known. In this work, the particle detection efficiencies of three ATOFMS instruments are determined under ambient sampling conditions from the results of colocated sampling with more conventional reference samplers at three locations in southern California. ATOFMS particle detection efficiencies display a power law dependence on particle aerodynamic diameter (D_a) over a calibration range of 0.32 < D_a < 1.8 microns. Detection efficiencies are determined by comparison of ATOFMS data with inertial impactor data and are compared to detection efficiencies determined independently by the use of laser optical particle counters. Detection efficiencies are highest for the largest particles and decline by approximately 2 orders of magnitude for the smallest particles, depending on the ATOFMS design. Calibration functions are developed here and applied to scale ATOFMS data to yield continuous aerosol mass concentrations as a function of particle size over an extended period of time.

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Additional Information:© 2000 American Chemical Society. Received for review April 13, 1999. Revised manuscript received September 7, 1999. Accepted October 12, 1999. Financial support for this research was provided by the California Air Resources Board under agreement 95-305 (University of California, Riverside) and by the U.S. Environmental Protection Agency under EPA Grant R824970-01-0 (California Institute of Technology).
Funding AgencyGrant Number
California Air Resources Board95-305
Environmental Protection Agency (EPA)R824970-01-0
Issue or Number:1
Record Number:CaltechAUTHORS:20160608-103845908
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Official Citation:Particle Detection Efficiencies of Aerosol Time of Flight Mass Spectrometers under Ambient Sampling Conditions Jonathan O. Allen, David P. Fergenson, Eric E. Gard, Lara S. Hughes, Bradley D. Morrical, Michael J. Kleeman, Deborah S. Gross, Markus E. Gälli, Kimberly A. Prather, and Glen R. Cass Environmental Science & Technology 2000 34 (1), 211-217 DOI: 10.1021/es9904179
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67774
Deposited By: George Porter
Deposited On:08 Jun 2016 18:33
Last Modified:11 Nov 2021 03:54

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