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Unipolar charging based, hand-held mobility spectrometer for aerosol size distribution measurement.

Authors
Qi-C; Kulkarni-P
Source
J Aerosol Sci 2012 Jul; 49(1):32-47
NIOSHTIC No.
20040553
Abstract
A hand-held particle size spectrometer for monitoring workplace exposure to aerosols and nanoparticles with 13 channels in the15-630 nm has been described.The instrument uses electrical mobility-based size classification in which aerosol particles are electrically charged using a unipolar corona charger, followed by classification in a condenser-type disk classifier, and particle counting using a commercial handheld condensation particle counter (CPC; Model 3007,TSI Inc.,Shoreview, MN). An unipolar charger was designed to reduce multiple charging of particles which helped extend the measurable size range.The electrical classifier, which served as a low-pass mobility filter,was operated at 2:1sheath-to-aerosol flow ratio using a single pump inside the CPC. An inversion scheme was developed to obtain discrete size distributions from cumulative mobility distributions. The sizing accuracy was also experimentally investigated using DMA-classified, near-monodisperse particles and was found to be in the range 1.4-8.1% below 300 nm, and increased to 13.6% for 500 nm particle. Experimentally measured sizing uncertainties ranged from 78-114%.The counting uncertainties of the instrument were in the range 0.1-10.5% for typical concentration range for ambient and workplace aerosols. Size distributions of test unimodal and bimodal polydisperse aerosols measured using HPSS agreed reasonably well with that from the laboratory scanning mobility spectrometer. HPSS can be useful in many routine monitoring applications, though the measured uncertainties can be large for some applications.
Keywords
Spectrographic-analysis; Nanotechnology; Particulate-dust; Particulates; Exposure-levels; Exposure-limits; Work-environment; Aerosols; Monitoring-systems; Monitors; Author Keywords: Nanoparticle size distribution; Aerosol mobility spectrometer; Portable aerosol instrumentation; Nanoparticle exposure
Contact
Pramod Kulkarni, Center for Disease Control and Prevention, National Institute for Occupational Safety and Health, 4676 Columbia Pkwy, MS; R7, Cincinnati, OH 45226
CODEN
JALSB7
Publication Date
20120701
Document Type
Journal Article
Email Address
PSKulkarni@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B04132012
Issue of Publication
1
ISSN
0021-8502
NIOSH Division
DART
Priority Area
Manufacturing
Source Name
Journal of Aerosol Science
State
OH
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