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Annals of Occupational Hygiene Advance Access published online on March 11, 2009
Annals of Occupational Hygiene, doi:10.1093/annhyg/mep008
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© The Author 2009. Published by Oxford University Press on behalf of the British Occupational Hygiene Society

A New Semivolatile Aerosol Dichotomous Sampler

Seung Won Kim* and Peter C. Raynor

Division of Environmental Health Sciences, School of Public Health, University of Minnesota, Minneapolis, MN, USA

* Author to whom correspondence should be addressed. Tel: +1-612-418-2314; fax: +1-612-626-0650; e-mail: kim.seungwon{at}gmail.com

This study reports the results of a numerical investigation and an experimental study on a round nozzle virtual impactor (VI) operated in two different modes. The newly proposed sampler, the semivolatile aerosol dichotomous sampler (SADS), was studied to overcome some of the problems of existing personal sampling methods such as evaporative loss during filter sampling. The main difference between VIs and the SADS was the inverted flow ratio between the major flow and the minor flow. Sampling in the SADS settings gives a lower cutsize in both numerical simulations and experimental results. Whereas the 50% separation efficiency for a VI occurred in numerical simulations when the square root of Stokes number equaled 0.97, the 50% efficiency for the same sampler run in the SADS settings occurred when the square root of the Stokes number was 0.27. The back pressure on each flow direction was studied and greater pressure drop was observed through the vapor flow in SADS settings. Sampling using a SADS was more effective than traditional filter methods because of its smaller cutsize, instant separation of vapor from particles and reduced particle losses.

dichotomous sampling • semivolatile aerosol • virtual impactor

Received July 22, 2008; in final form January 7, 2009


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