Spatial and temporal variability of incidental ...

2 downloads 0 Views 913KB Size Report
Oct 26, 2014 - point source study using an older model laser printer as the emission source indicated that ... sions,4 which includes ultra ne particles (UFPs) that originate .... been previously characterized35 as high emitting printers, HP.
Environmental Science

Processes & Impacts PAPER

Cite this: Environ. Sci.: Processes Impacts, 2015, 17, 98

Spatial and temporal variability of incidental nanoparticles in indoor workplaces: impact on the characterization of point source exposures Jianjun Niu,a Pat E. Rasmussen,*ab Robert Mageec and Gregory Nilssonc 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 nanoscale 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 Diļ¬€usion Charger (DC2000CE) for assessing total particle mass and surface area concentrations respectively. In terms of number concentration, NPs (