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Träfflista för sökning "WFRF:(Hardy J) srt2:(1975-1979)"

Sökning: WFRF:(Hardy J) > (1975-1979)

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1.
  • Akselsson, Roland, et al. (författare)
  • X-Ray Techniques for Aerosol Sulfur Baseline Assessment Along an Urban Freeway
  • 1976
  • Ingår i: Advances in X-Ray Analysis. ; 19, s. 415-425
  • Tidskriftsartikel (refereegranskat)abstract
    • 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
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