Characterization of a Nano-Aerosol Using a Portable Scanning Mobility Particle Sizer and Electron Microscopy

Details

• Personal Author:
  Hammad Y ; Marty A
• Description:
  Objective: Portable scanning mobility particle sizers (SMPS) offer convenient means to collect information about nano-sized aerosols because they provide real-time distributions. Electron microscopy (EM) applied to a filter sample has been considered the traditional method for the sizing and counting of small particles. However, the later method is time consuming. The objectives of this research are to generate a stable and reproducible sodium chloride aerosol and to compare the size distributions obtained from SMPS and EM. Methods: A sodium chloride aerosol was generated and introduced into a sample chamber. The size of the generated particles ranged from 20 to 250 nm. The consistency of the aerosol concentration was monitored using a particle counter. A portable SMPS was used to determine the size distributions of the generated aerosols. Polycarbonate membrane filters were used to collect the aerosols for subsequent EM analysis. The particle size distributions were determined from photographs of the membrane filters. SMPS and membrane samples were collected simultaneously. Results: Background counts were less than 0.3 particles/cc. Conditions during data collection showed that target particle size, particle concentration, and relative humidity were well controlled. SMPS data yielded log-normal size distributions with a geometric means between 65 to 80 nm. EM analysis of the particles collected yielded log-normal size distributions with a geometric means between 40 to 42 nm. Conclusion: A well characterized aerosol could be generated and reproduced. Physical counting methods using EM were cumbersome and different than those obtained from SPMS. The differences in the results could be attributed to the sensitivities of the methods used in this study. [Description provided by NIOSH]
• Subjects:
  Aerosols Chlorine Humidity Occupational Health Particulate Matter Safety
• Keywords:
  Aerosol Author Keywords: Nanoparticle Chlorides Distribution Electron Microscopy Filters Microscopy Nanoparticles Nanotechnology Particle Counters Particle Size Particle Sizers Particulates Sampling Scanning Techniques SMPS Sodium

  More +
• Publisher:
  University of South Florida (USF)
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Abstract or Summary
• Place as Subject:
  Florida ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  13
• NIOSHTIC Number:
  nn:20064201
• Citation:
  Sunshine ERC Research Poster Session/USF Health Research Day, February 20-22, 2014, Tampa, Florida. Tampa, FL: University of South Florida (USF), 2014 Feb; :13
• Contact Point Address:
  Adam Marty, USF Sunshine ERC Industrial Hygiene Program
• Federal Fiscal Year:
  2014
• Performing Organization:
  Sunshine Education and Research Center, University of South Florida
• Peer Reviewed:
  False
• Start Date:
  20050701
• Source Full Name:
  Sunshine ERC Research Poster Session/USF Health Research Day, February 20-22, 2014, Tampa, Florida
• End Date:
  20290630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:0ea072f38346217a5627e3022404cc5926ee8f8cd561eeaee2e1caaef9d0b2b6e7aa4da12bf2cb51abeb0f628023c0092846eec6a48f13aa78bfb711ab73f8b5
• Download URL:
  https://stacks.cdc.gov/view/cdc/222706/cdc_222706_DS1.pdf
• File Type:
  [PDF - 180.25 KB ]