Research Projects

Project at a Glance

Project Status: complete

Title: Design, construction and test results of a small centrifuge aerosol spectrometer for fine particulate.

Principal Investigator / Author(s): Anderson, Paul L

Contractor: Kaiser Aluminum & Chemical Corp. Center for Technology

Contract Number: 2-290


Research Program Area: Atmospheric Processes

Topic Areas: Monitoring


Abstract:

A centrifuge ambient aerosol sampling device for very small particles has been designed, built ad tested. The unit is compact, hand carriable, and built into a suitcase sized enclosure. The sampling head consists of a spirally shaped processer annulus machined into an aluminum cylinder about 3-1/4" in diameter. A centrifugal force precleaner provides a clean process carrier gas through which the particles of the sample aerosol are spectrally separated. The sized particles may be deposited on to any thin substrate such as mylar, paper or metal foil. The deposited particles occur as a spectral distribution of sizes along the length of the collector strip. One calibration ranges from 0.16 to 1.6 m; a second tentative calibration ranges from 0.9 to ~8 m. A 5 % calibration precision was attained. The analytical sampling rate is 1 ml/sec. The collected particulate is remarkably amenable to scanning electron microscopic analysis. Attempts to do direct chemical analyses on the particulate by an energy dispersive x-ray method has been unsuccessful, probably because of insufficient sensitivity of the x-ray instrument.


 

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