Abstract
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.
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