Excursion guidance criteria to guide control of peak emission and exposure to airborne engineered particles

McGarry, Peter, Morawska, Lidia, Knibbs, Luke D. and Morris, Howard (2013) Excursion guidance criteria to guide control of peak emission and exposure to airborne engineered particles. Journal of Occupational & Environmental Hygiene, 10 11: 640-651. doi:10.1080/15459624.2013.831987


Author McGarry, Peter
Morawska, Lidia
Knibbs, Luke D.
Morris, Howard
Title Excursion guidance criteria to guide control of peak emission and exposure to airborne engineered particles
Journal name Journal of Occupational & Environmental Hygiene   Check publisher's open access policy
ISSN 1545-9624
1545-9632
Publication date 2013-11
Sub-type Article (original research)
DOI 10.1080/15459624.2013.831987
Open Access Status
Volume 10
Issue 11
Start page 640
End page 651
Total pages 12
Place of publication Philadelphia, PA, United States
Publisher Taylor & Francis
Collection year 2014
Language eng
Formatted abstract
The overall aim of our research was to characterize airborne particles from selected nanotechnology processes and to utilize the data to develop and test quantitative particle concentration-based criteria that can be used to trigger an assessment of particle emission controls.

We investigated particle number concentration (PNC), particle mass (PM) concentration, count median diameter (CMD), alveolar deposited surface area, elemental composition, and morphology from sampling of aerosols arising from six nanotechnology processes. These included fibrous and non-fibrous particles, including carbon nanotubes (CNTs).

We adopted standard occupational hygiene principles in relation to controlling peak emission and exposures, as outlined by both Safe Work Australia, and the American Conference of Governmental Industrial Hygienists (ACGIH®). The results from the study were used to analyses peak and 30-minute averaged particle number and mass concentration values measured during the operation of the nanotechnology processes.

Analysis of peak (highest value recorded) and 30-minute averaged particle number and mass concentration values revealed: Peak PNC20–1000 nm emitted from the nanotechnology processes were up to three orders of magnitude greater than the local background particle concentration (LBPC). Peak PNC300–3000 nm was up to an order of magnitude greater, and PM2.5 concentrations up to four orders of magnitude greater. For three of these nanotechnology processes, the 30-minute average particle number and mass concentrations were also significantly different from the LBPC (p-value < 0.001).

We propose emission or exposure controls may need to be implemented or modified, or further assessment of the controls be undertaken, if concentrations exceed three times the LBPC, which is also used as the local particle reference value, for more than a total of 30 minutes during a workday, and/or if a single short-term measurement exceeds five times the local particle reference value. The use of these quantitative criteria, which we are terming the universal excursion guidance criteria, will account for the typical variation in LBPC and inaccuracy of instruments, while precautionary enough to highlight peaks in particle concentration likely to be associated with particle emission from the nanotechnology process. Recommendations on when to utilize local excursion guidance criteria are also provided.
Keyword Excursion guidance criteria
Engineered nanoparticle
Nanotechnology
Particle measurement
Tiered assessment
Local background particle concentration
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Public Health Publications
 
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Created: Thu, 26 Sep 2013, 08:10:25 EST by Luke Knibbs on behalf of School of Public Health