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

Published online by Cambridge University Press:  06 March 2019

K. R. Akselsson ,
K.A. Hardy ,
G.G. Desaedeleer ,
J.W. Winchester ,
W.W. Berg ,
T.B. Vander Wood  and
J.W. Nelson
K. R. Akselsson
Affiliation:
Department of Oceanography Florida State University, Tallahassee, FL 32306 Lund Institute of Technology, S-223 62 Lund, Sweden
K.A. Hardy
Affiliation:
Department of Physical Science, Florida International University, Miami, FL 33144
G.G. Desaedeleer
Affiliation:
Department of Oceanography Florida State University, Tallahassee, FL 32306
J.W. Winchester
Affiliation:
Department of Oceanography Florida State University, Tallahassee, FL 32306
W.W. Berg
Affiliation:
Department of Oceanography Florida State University, Tallahassee, FL 32306
T.B. Vander Wood
Affiliation:
Department of Oceanography Florida State University, Tallahassee, FL 32306
J.W. Nelson
Affiliation:
Department of Oceanography and Physics Florida State University, Tallahassee, FL 32306
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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 auto mobiles, equipped with catalytic emission control devices, appeared in large numbers. The sampling plan was optimized a c cording to the requirements of X-ray analysis techniques, fluctuations in air flow across the freeway, and the time and particlesise 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 impactorsope rating 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 three 7-meter heights using time series streaker filter samplers with two-hour time resolution. Precise analyses 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.

Type
X-Ray Spectrometry in Environmental Analysis
Information
Advances in X-Ray Analysis , Volume 19: Twenty-Fourth Annual Conference on Applications of X-ray Analysis, August 6-8, 1975 , 1975 , pp. 415 - 425
Copyright
Copyright © International Centre for Diffraction Data 1975

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