Dichotomous Samplers Modified for Use with Electron Microscopy

Large sulfate artifacts up to 2 μm in diameter were observed by scanning electron microscopy for the fine particle fraction collected in dichotomous samplers. The artifacts were attributed to small liquid particles that piled up on the filter, coalesced, and later dried as larger particles. Such art...

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Bibliographic Details
Published in:Aerosol science and technology 1990-01, Vol.13 (2), p.241-248
Main Authors: Mamane, Yaacov, Dzubay, Thomas G.
Format: Article
Language:English
Subjects:
Analysis methods
Applied sciences
Atmospheric pollution
Exact sciences and technology
Pollution
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Summary:Large sulfate artifacts up to 2 μm in diameter were observed by scanning electron microscopy for the fine particle fraction collected in dichotomous samplers. The artifacts were attributed to small liquid particles that piled up on the filter, coalesced, and later dried as larger particles. Such artifacts were eliminated when particles were collected in a modified dichotomous sampler in which 80% to 90% of the airflow was diverted from the fine fraction filter. This airflow diversion technique was used successfully with both virtual-impactor and tandem-filter types of dichotomous samplers.
ISSN:0278-6826
1521-7388
DOI:10.1080/02786829008959442