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Sampling methods used for the collection of particle-phase organic and elemental carbon during ACE-Asia

Mader, B. T. and Schauer, J. J. and Seinfeld, J. H. and Flagan, R. C. and Yu, J. Z. and Yang, H. and Lim, Ho-Jin and Turpin, B. J. and DeMinter, J. T. and Heidemann, G. and Bae, M. S. and Quinn, P. and Bates, T. and Eatough, D. J. and Huebert, B. J. and Bertram, T. and Howell, S. (2003) Sampling methods used for the collection of particle-phase organic and elemental carbon during ACE-Asia. Atmospheric Environment, 37 (11). pp. 1435-1449. ISSN 1352-2310. doi:10.1016/S1352-2310(02)01061-0.

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The semi-volatile nature of carbonaceous aerosols complicates their collection, and for this reason special air sampling configurations must be utilized. ACE-Asia provided a unique opportunity to compare different sampling techniques for collecting carbonaceous aerosols. In this paper detailed comparisons between filter-based carbonaceous aerosol sampling methods are made. The majority of organic carbon (OC) present on a backup quartz fiber filter (QFF) in an undenuded-filter sampler resulted from the adsorption of native gaseous OC rather than OC evaporated from collected particles. The level of OC on a backup QFF placed behind a QFF was lower than the level present on a backup QFF placed behind a Teflon membrane filter (TMF) indicating that gas/filter equilibrium may not be achieved in some QFF front and backup filter pairs. Gas adsorption artifacts can result in a 20–100% overestimation of the ambient particle-phase OC concentration. The gas collection efficiency of XAD-coated and carbon-impregnated filter-lined denuders were not always 100%, but, nonetheless, such denuders minimize gas adsorption artifacts. The median fraction of particle-phase OC that is estimated to evaporate from particles collected by denuder-filter samplers ranged from 0 to 0.2; this value depends on the sampler configuration, chemical composition of the OC, and sampling conditions. After properly correcting for sampling artifacts, the measured OC concentration may differ by 10% between undenuded- and denuder-filter samplers. Uncorrected, such differences can be as large as a factor two, illustrating the importance of sampling configurations in which gas adsorption or evaporation artifacts are reduced or can be corrected.

Item Type:Article
Related URLs:
URLURL TypeDescription
Schauer, J. J.0000-0002-5405-1511
Seinfeld, J. H.0000-0003-1344-4068
Flagan, R. C.0000-0001-5690-770X
Lim, Ho-Jin0000-0002-3211-8084
Turpin, B. J.0000-0003-4513-4187
Huebert, B. J.0000-0001-7711-0468
Bertram, T.0000-0002-3026-7588
Additional Information:The Caltech group was supported by Office of Naval Research Grant N00014-96-0119 and National Science Foundation Grant ATM-0001934. The PMEL measurements were funded by the Aerosol Project of the NOAA Climate and Global Change Program.
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-96-0119
National Oceanic and Atmospheric Administration (NOAA)UNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:MADate03.738
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7853
Deposited By: Stephanie Chang
Deposited On:14 Feb 2023 23:39
Last Modified:15 Feb 2023 22:27

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