Characterization of an aerosol microconcentrator for analysis using microscale optical spectroscopies

Details

• Personal Author:
  Birch, M. Eileen ; Dionysiou DD ; Kulkarni P ; Liang H ; Zavvos K ; Zheng L
• Description:
  Efficient microconcentration of aerosols to a substrate is essential for effectively coupling the collected particles to microscale optical spectroscopies such as laser-induced or spark microplasma, or micro-Raman or infrared spectroscopies. In this study, we present detailed characterization of a corona-based aerosol microconcentration technique developed previously (Diwakar & Kulkarni, 2012). The method involves two coaxial electrodes separated by a few millimeters, one held at a high electrical potential and the other grounded. The particles are collected on the collection (i.e., ground) electrode from a coaxial aerosol flow in a one-step charge-and-collect scheme using corona discharge and electrical precipitation between the two electrodes. Performance of the corona microconcentration method was determined experimentally by measuring collection efficiency, wall losses, and particle deposition density. An intrinsic spectroscopic sensitivity was experimentally determined for the aerosol microconcentrator. Using this sensitivity, we show that corona-based microconcentration is much superior to alternative methods, including filtration, focused impaction using aerodynamic lens, and spot collection using condensational growth. The method offers unique advantages for compact, hand-held aerosol analytical instrumentation. [Description provided by NIOSH]
• Subjects:
  Aerosols Electricity Occupational Health Particulate Matter Safety Spectrum Analysis
• Keywords:
  Author Keywords: Microconcentration Electrical Equipment Electrical Fields Electrical Grounding Measurement Sensitivity Optical Spectroscopy Particulates Portable Analytical Instrumentation Spectrographic Analysis
• ISSN:
  0021-8502
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  66-78
• Volume:
  104
• NIOSHTIC Number:
  nn:20049032
• Citation:
  J Aerosol Sci 2017 Feb; 104:66-78
• Contact Point Address:
  Pramod Kulkarni, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Cincinnati, OH 45226
• Email:
  PSKulkarni@cdc.go
• Federal Fiscal Year:
  2017
• NORA Priority Area:
  Manufacturing
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Aerosol Science
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:863a54e9944dbb0cf3b296c5186479c9bc5bf387fb1db9c7492509bb80772158d0e6d761d0425ee1067a17b50f317df4e69e3935fcc1bfbbd9d5d6695979e362
• Download URL:
  https://stacks.cdc.gov/view/cdc/203622/cdc_203622_DS1.pdf
• File Type:
  [PDF - 1.44 MB ]