PMID- 25410705
OWN - NLM
STAT- MEDLINE
DCOM- 20150512
LR  - 20141224
IS  - 2050-7895 (Electronic)
IS  - 2050-7887 (Linking)
VI  - 17
IP  - 1
DP  - 2015 Jan
TI  - Spatial and temporal variability of incidental nanoparticles in indoor 
      workplaces: impact on the characterization of point source exposures.
PG  - 98-109
LID - 10.1039/c4em00478g [doi]
AB  - This study deployed a suite of direct-reading instruments in six locations inside 
      one building to characterize variability of the background aerosol, including 
      incidental nanoparticles (NP), over a six month period. The instrument suite 
      consisted of a portable Condensation Particle Counter (CPC) and a Scanning 
      Mobility Particle Sizer (SMPS) for assessing particle number concentrations and 
      size distributions in the nano-scale range; an Aerodynamic Particle Sizer (APS) 
      for assessing micron-scale particle number concentrations and size distributions; 
      plus a desktop Aerosol Monitor (DustTrak DRX) and a Diffusion Charger (DC2000CE) 
      for assessing total particle mass and surface area concentrations respectively. 
      In terms of number concentration, NPs (<100 nm) were the dominant particles 
      observed in the background aerosol, contributing up to 53-93% of the total 
      particle number concentrations. The particle size distributions were bimodal with 
      maxima around 19-79 nm and 50-136 nm, respectively, depending on workplace 
      locations. The average detected background particle number, surface area and 
      total mass concentrations were below 7.1 x 10(3) # cm(-3), 22.9 mum(2) cm(-3) and 
      33.5 mug m(-3), respectively in spring samples and below 1.8 x 10(3) # cm(-3), 
      10.1 mum(2) cm(-3) and 12.0 mug m(-3), respectively in winter samples. A point 
      source study using an older model laser printer as the emission source indicated 
      that NPs emitted from the investigated printer were distinguishable from 
      background. However, more recent low emitting printers are likely to be 
      indistinguishable from background, and chemical characterization (e.g. VOCs, 
      metals) would be required to help identify emission sources.
FAU - Niu, Jianjun
AU  - Niu J
AD  - Environmental Health Science and Research Bureau, HECSB, Health Canada, Ottawa, 
      Ontario K1A 0K9, Canada. Pat.Rasmussen@hc-sc.gc.ca.
FAU - Rasmussen, Pat E
AU  - Rasmussen PE
FAU - Magee, Robert
AU  - Magee R
FAU - Nilsson, Gregory
AU  - Nilsson G
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20141120
PL  - England
TA  - Environ Sci Process Impacts
JT  - Environmental science. Processes & impacts
JID - 101601576
RN  - 0 (Aerosols)
RN  - 0 (Air Pollutants, Occupational)
SB  - IM
MH  - Aerosols/analysis
MH  - Air Pollutants, Occupational/*analysis
MH  - Air Pollution, Indoor/*analysis/statistics & numerical data
MH  - Environmental Monitoring
MH  - Inhalation Exposure/statistics & numerical data
MH  - Models, Chemical
MH  - Nanoparticles/*analysis
MH  - Occupational Exposure/analysis/statistics & numerical data
MH  - Particle Size
MH  - *Workplace
EDAT- 2014/11/21 06:00
MHDA- 2015/05/13 06:00
CRDT- 2014/11/21 06:00
PHST- 2014/11/21 06:00 [entrez]
PHST- 2014/11/21 06:00 [pubmed]
PHST- 2015/05/13 06:00 [medline]
AID - 10.1039/c4em00478g [doi]
PST - ppublish
SO  - Environ Sci Process Impacts. 2015 Jan;17(1):98-109. doi: 10.1039/c4em00478g. Epub 
      2014 Nov 20.