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DICHOTOMOUS SAMPLERS MODIFIED FOR USE WITH ELECTRON MICROSCOPY
Citation:
Mamane, Y. AND T. Dzubay. DICHOTOMOUS SAMPLERS MODIFIED FOR USE WITH ELECTRON MICROSCOPY. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/183 (NTIS PB91116830).
Description:
Large sulfate artifacts up to 2 um in diameter were observed by scanning electron microscopy for the fine particle fraction collected in dichotomous samplers. he artifacts were attributed to small liquid particles that piled up on the filter, coalesced, and later dried as larger particles. uch 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. his airflow diversion technique was used successfully with both virtual-impactor and tandem-filter types of dichotomous samplers.
