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Related Experiment Video

Updated: Jun 24, 2026

Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA

Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA

Published on: May 2, 2018

A new semivolatile aerosol dichotomous sampler.

Seung Won Kim¹, Peter C Raynor

¹Division of Environmental Health Sciences, School of Public Health, University of Minnesota, Minneapolis, MN, USA. kim.seungwon@gmail.com

The Annals of Occupational Hygiene

|March 13, 2009

Summary

The semivolatile aerosol dichotomous sampler (SADS) offers improved aerosol sampling by achieving a lower cutsize and reducing particle loss compared to traditional virtual impactors. This novel method enhances sampling efficiency for volatile compounds.

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Published on: February 22, 2019

Area of Science:

Environmental Science
Analytical Chemistry
Mechanical Engineering

Background:

Traditional personal sampling methods for aerosols face challenges like evaporative loss of semivolatile compounds.
Virtual impactors (VIs) are used for aerosol size segregation, but may not fully address evaporative losses.

Purpose of the Study:

To investigate the performance of a newly proposed semivolatile aerosol dichotomous sampler (SADS).
To compare the SADS performance against traditional virtual impactor (VI) operation modes.
To evaluate the SADS for overcoming evaporative loss issues in aerosol sampling.

Main Methods:

Conducted numerical simulations and experimental studies on a round nozzle virtual impactor.
Operated the sampler in two distinct modes: standard VI and SADS settings.
Analyzed back pressure and particle separation efficiency based on the Stokes number.

Main Results:

The SADS configuration achieved a significantly lower cutsize compared to the VI mode.
The 50% separation efficiency occurred at a lower Stokes number (0.27) in SADS mode versus VI mode (0.97).
A greater pressure drop was observed in the vapor flow within the SADS settings.

Conclusions:

The SADS demonstrates superior performance over traditional filter methods due to its smaller cutsize and instant vapor-particle separation.
The SADS effectively reduces particle losses during sampling.
The SADS is a promising alternative for sampling semivolatile aerosols, mitigating evaporative losses.