Journal of Community Medicine & Health Education
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A combination of direct-reading instrumentation and filter-based mass measurement strategies were used for improved
exposure characterization of airborne particles including nanoparticles (NPs) in the workplace. The integrated instrument
suite consisted of a portable scanning mobility particle sizer (SMPS), a portable condensation particle sizer (CPC), an
aerodynamic particle sizer (APS), a diffusion charger (DC), and aerosol mass monitors (Dust Trak), for in situ monitoring
and characterization of particle number, mass and active surface area concentrations and size distributions. A micro-orifice
uniform deposit impactor (nano MOUDI) in combination with Health Canada�s patented Archimedes M3� buoyancy-corrected
gravimetric analysis facility and an inductively coupled plasma-mass spectrometry (ICP-MS) were used for filter-based size
fractionation, gravimetric analysis and determination of metal distribution. One of the most challenging tasks for accurate NP
risk assessment and management was distinguishing background from process-related NP emissions, due to the wide temporal
and spatial variability of background NPs.
Dr. Jianjun Niu is a senior research chemist at the Environmental Health Science and Research Bureau of Health Canada. He received his Ph.D from Changchun Institute of Applied Chemistry, Chinese Academy of Science and his postdoctoral research experience at both Max-Plunk Institute for Polymer Research, Germany and University of Ottawa, Canada. His current research mainly focuses on human exposures to particulate matter (PM) and metals in urban air and in household dust (HD), nanoparticles (NPs) characterization and exposure assessment, and metal bioaccessibility and speciation in PM, NPs and HD. He has published more than 80 papers in peer-reviewed journals and conference proceedings.
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