X-Ray Techniques for Aerosol Sulfur Baseline Assessment Along an Urban Freeway

Roland Akselsson, Ken A Hardy, Georges G Desaedeler, John W Winchester, Walter W Berg, Timothy B Vandeer Wood, J William Nelson, L L Spiller, W E Wilson

Research output: Contribution to journalArticlepeer-review


Atmospheric aerosol particles have been sampled near a Los Angeles freeway and analyzed by proton-induced X-ray emission, PIXE, as a sulfur baseline study in September 1974 before 1975-model automobiles, equipped with catalytic emission control devices, appeared in large numbers. The sampling plan was optimized according to the requirements of X-ray analysis techniques, fluctuations in air flow across the freeway, and the time and particle size resolution of the aerosol sampling equipment. During five selected two-hour intervals with cross wind conditions, particles were collected as a function of size by six cascade impactors operating simultaneously on three towers at 2 and 7 meters above road level 35 meters upwind and 35 meters downwind of the traffic lanes. Particles as a function of time were sampled continuously, for the 100-hour duration of the experiment, from the tree 7-meter heights using time series streaker filter samplers with two-hour time resolution. Precise analysis of S, Cl, K, Ca, Fe, Br, and Pb established relationships which permit estimates to be made of future increases in particulate sulfur as a consequence of increased sulfate emissions from catalytic automobiles
Original languageEnglish
Pages (from-to)415-425
JournalAdvances in X-Ray Analysis
Publication statusPublished - 1976

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Nuclear Physics (Faculty of Technology) (011013007), Ergonomics and Aerosol Technology (011025002)

Subject classification (UKÄ)

  • Production Engineering, Human Work Science and Ergonomics
  • Subatomic Physics


  • urban aerosol
  • PIXE
  • particle size fraction
  • elemental composition
  • time resolution


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