OEH 5743 Industrial Hygiene & Environmental Measurements
Aerosol Personal Sampling in the occupational environment
The aerosol personal sampling section is divided into three lectures: background of aerosol science, personal samplers, size and number measurements:
Students will first get to understand the definition, basic terminology, physical and chemical properties of aerosol. The first lecture will also cover the concept and demonstration of common aerosol generation devices such as Collison nebulizer, vibrating orifice aerosol generator (VOAG), and small-scale powder dispenser (SSPD).
In the personal samplers lecture, students will be exposed to the principle of aerosol collection on medium such as filter, foam, and impactor plate, and the rationales behind the medium selection. The student will then learn the concept of inhalable and respirable fractions. A hand-on lab will cover the use of IOM inhalable sampler and cyclonic respirable sampler in a simulated welding environment.
The final lecture will be the size and number measurement of aerosol. Although not very common in industrial hygienist routine jobs, the size measurement will be useful if the student likely continues to pursue research career. Lecture will cover the electron microscopes, differential mobility analyzer (DMA), condensation particle counter (CPC), and aerodynamic particle sizer (APS). The lab demonstration includes the operation of a scanning mobility particle sizer (SMPS) and an ultraviolet aerodynamic particle sizer (UV-APS).
Ambient particulate matters (PM) measurement
M.S. student enrolled in this course (Karriem and Shaun) are operating the BGI PQ200 sampler to collect PM2.5 samples on the roof of College of Health Building. (May, 2014)
The ambient particulate matters measurement section is similar to the indoor aerosol sampling. Students start with the fundamental concepts of the air pollution and air quality monitoring. Various air quality monitoring techniques will be introduced during the class.
During the second lecture, the student will get to know the principle of size-selected PM samplings. The lab will include a 24-hrs PM2.5 sampling using a BGI PQ-200 sampler and 47 mm filters.
The final lecture will carry the post-sampling data interpretation. Chemical mass balance (CMB) and positive matrix factorization (PMF) models will be used to demonstrate the purpose of regular air quality monitoring.
Lecture slides (available through D2L system)
Aerosol Education Website
Description, performance and application of Collison Nebulizer
Workplace aerosol measurement
Definitions of respirable fraction
EPA Introduction to PM
Ambient PM sampling
EPA PMF 3.0 user guideline
BGI PQ200 manual
BGI PQ200 SOP
Overview of PM sampling FRAM and FEM