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Design and Validation of a Passive Deposition Sampler

by
Stephanie Ann Einstein
B.S. University of Delaware - 2006



Thesis Advisor: Paul Lioy, Ph.D.
Graduate Program in Exposure Assessment Science

EOHSI Conference Room C
170 Frelinghuysen Road
Piscataway, NJ

Monday, May 16, 2011
9:30 a.m.


Abstract

A new, passive, air sampler, called the Einstein-Lioy Deposition Sampler (ELDS) has been developed to fill a gap in passive sampling for near-field air-pollution problems. This sampler can be configured in several ways: with a protective hood outdoors, without the hood indoors or outdoors, and as a dust plate. In addition, there is XRF-ready option, which allows for direct sampling onto a filter mounted on an XRF cartridge. This thesis discusses the development and validation of a sampler for air-pollution studies. A wind tunnel was designed and constructed to test the sampler configurations against a test dust with a known particle size distribution. The sampler configurations were also tested against each other. Analysis was completed using optical microscopy and software that allows for particle counting in images. The Hooded and Non-Hooded sampler versions were compared to one another to determine if the hood would affect any size selection on the ELDS base. The results showed that the Hooded and Non-Hooded versions collected particle size distributions were statistically the same, though both differed from the test dust. It is possible that the test dust distribution changed within the tunnel or particles with very small diameters may not have settled within the wind tunnel distance. This is further supported by the particle size distribution found on an active sampler, co-located to the ELDS, that operated within the wind tunnel. Because the two main versions of the sampler are statistically the same, the ELDS can be used indoors and outdoors in a variety of configurations to suit the user`s needs.


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