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Träfflista för sökning "WFRF:(Akselsson Roland) srt2:(1975-1979)"

Sökning: WFRF:(Akselsson Roland) > (1975-1979)

  • Resultat 21-30 av 58
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21.
  • 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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22.
  • Bohgard, Mats, et al. (författare)
  • An Analytical Procedure for Determining Chromium in Samples of Airborne Dust
  • 1979
  • Ingår i: Annals of Occupational Hygiene. - : Oxford University Press (OUP). - 1475-3162. ; 22:3, s. 241-251
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract in UndeterminedA method is described for assessing occupational exposures to chromium aerosols; it involves four procedures. The first, proton induced X-ray emission (PIXE), measures the total chromium,. The second, electron spectroscopy for chemical analysis (ESCA), measures the oxidation state of the particle surfaces, and the third, which uses sym-diphenylcarbazide (DPC), measures the proportion of water-soluble chromium VI. The fourth, transmission electron microscopy (TEM), provides information about the size and shape of the particles and guides the interpretation of the ESCA-data.The multielemental nature of PIXE-analysis is advantageous in eliminating the possibility of interference in the DPC-method and in eliminating chromium compounds from the tentative list of existing health hazards in the smoke. These methods were applied to the analysis of samples of fume produced in welding, and information was obtained for the amounts of soluble and insoluble chromium (III and VI) in samples of different aerosols.
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25.
  • Bohgard, Mats, et al. (författare)
  • ESCA analyser av krom i svetsrök
  • 1976
  • Ingår i: Svenska Läkaresällskapets riksstämma 1976. ; , s. 69-69
  • Konferensbidrag (refereegranskat)
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28.
  • Carlsson, Lars-Eric, et al. (författare)
  • Karakterisering av svetsrök
  • 1977
  • Ingår i: Svenska Läkaresällskapets Riksstämma 1977, Omgivningshygien 11. ; , s. 443-443
  • Konferensbidrag (refereegranskat)
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30.
  • Desaedeleer, Georges G, et al. (författare)
  • Monitoring Aerosol Elemental Composition in Particle Size Fractions for Predicting Human Respiratory Uptake
  • 1977
  • Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - 0167-5087. ; 142:1-2, s. 97-99
  • Tidskriftsartikel (refereegranskat)abstract
    • Proton induced X-ray emission analysis is useful in measuring changes in particle size distribution of trace elements on exposure of aerosol to the human lung environment and deposition in the air-ways. PIXE analysis is also useful in detecting variations in particle size distributions of elements as they occur in the atmosphere. For the case of lead aerosol along a highway, it is shown that the extent and site of respiratory deposition of particles depend on their size, and the size distribution may vary under urban atmospheric conditions sufficiently to affect respiratory deposition efficiency.
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  • Resultat 21-30 av 58

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