Evaluation of the ERC virtual impactor

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Abstract
Measurements have been made on a dichotomous virtual impactor developed by the Environmental Research Corporation. The object was to study the feasibility of employing the virtual impaction scheme in air samplers to collect size fractionated particle samples for subsequent x-ray fluorescence analysis. The size separation characteristics and losses as a function of particle size at specific locations within the apparatus were determined. It was found that except for the intrinsic losses near the size cut point, most of the losses can be significantiy reduced with improved design. The prospect of large scale deployment of virtual impactors for continuous air monitoring is favorable. (auth)

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