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United States Department of Agriculture

Agricultural Research Service

Title: Evaluation of An Atmospheric Dust Collector for the Measurement of Organic Contaminant Depositon

Authors
item Poster, D - NIST/DOC
item Gluckman, Brian - USDA/ARS
item Quinn, T - NIST/DOC
item Rice, Clifford

Submitted to: Society of Environmental Toxicology and Chemistry Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 12, 1998
Publication Date: N/A

Technical Abstract: The efficiency of an atmospheric dust collector to measure depositional fluxes of organic contaminants was evaluated using a co-located nine stage micro-orifice particle impactor and highly-resolved meteorological data. Size-distributions of atmospheric particles bearing various PAHs in a suburban airshed and detailed meteorological data are used to model dry depostion velocities and fluxes of particle-associated PAHs as a function of particle size. These data are compared to daily deposition measurements obtained using an atmospheric dust collector described as a semi-passive, open-air sampler. A key aspect of this work is the use of detailed meteorological data to incorporate episodic deposition-inducing conditions that affect local particle depositional fulxes of trace constituents over very short time scales. An apparent limit of the comparison is the micro-orifice's particle-size cut-off for large particles (ca.19 um). Observed differences in dry deposition between that estimated from the micro-orifice particle impactor data and that measured with the dust collector are attributed to the collection of large particles and gases by the dust collector.

Last Modified: 10/1/2014