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Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA
Published on: May 2, 2018
Aerosol sampling by annular aspiration slots.
Peter Görner1, Olivier Witschger, Florence Roger
1INRS-Institut National de Recherche et de Sécurité, BP 27, F-54501, Vandoeuvre lès Nancy, France.
Journal of Environmental Monitoring : JEM
|November 28, 2008
Summary
Optimized annular aspiration slots effectively sample airborne particles, showing minimal efficiency loss with increasing particle size. This research led to a prototype personal aerosol sampler for occupational health assessments.
Area of Science:
- Environmental Science
- Occupational Health and Safety
- Aerosol Science and Technology
Background:
- Accurate sampling of airborne particles is crucial for environmental monitoring and occupational health.
- Existing sampling methods may be sensitive to external wind conditions, affecting efficiency.
- Optimization of sampling head geometry and aerodynamic conditions is needed to improve particle capture.
Purpose of the Study:
- To investigate the performance of annular aspiration slots for sampling airborne particles.
- To optimize geometric and aerodynamic parameters for enhanced sampling efficiency.
- To develop and validate models for predicting sampling efficiency under various conditions.
Main Methods:
- Laboratory experiments were conducted using a wind tunnel to measure sampling efficiency.
- Efficiency was assessed as a function of particle aerodynamic diameter and external wind speed.
- Two semi-empirical models for sampling efficiency in moving and calm air were derived and experimentally validated.
Main Results:
- Optimized annular slot parameters resulted in sampling efficiency that decreased minimally with increasing particle size.
- Omnidirectional annular sampling heads demonstrated reduced sensitivity to external wind.
- Inner particle losses within the sampling heads were minimized.
Conclusions:
- Annular aspiration slots offer a promising approach for efficient airborne particle sampling.
- The developed models accurately predict sampling efficiency, facilitating sampler design.
- A prototype personal aerosol sampler, based on these findings, meets requirements for inhalable aerosol sampling in occupational safety and health.
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