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| Maenhaut, W.; Raemdonck, H.; Selen, A.; Van Grieken, R.; Winchester, J.W.. |
| By using a polyester sailboat as sampling platform, a series of duplicate aerosol samples was collected by cascade impactors on a trip from Panama to Tahiti in 1979. Elemental analysis mainly by particle-produced X-ray emission (PIXE) indicated, in the samples collected between Panama and the Galapagos Islands, the presence of a substantial crustal component (0.4 µg/m³), fine Cu (0.4 ng/m³ and Zn (0.6 ng/m³), and excess fine S and K (100 and 2.4 ng/m³, respectively in addition to the major sea salt elements. The crustal component and fine Cu and Zn are suggested to result from natural continental sources (i.e., eolian dust transport from the American continents and perhaps geothermal emissions). Samples collected west of the Galapagos Islands in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aerosols IS; Equatorial Pacific. |
| Ano: 1983 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3398 |
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| Johansson, T.B.; Van Grieken, R.E.; Winchester, J.W.. |
| Biased data set averaging has been used to examine aerosol elemental composition data for air mass directional effects. Samples collected in north Florida during spring and summer 1973 were influenced by local and remote continental sources and additionally by maritime sources when air flow was southerly. Judgments of air movements during the collection of 32 5-stage cascade impactor samples were made by examination of daily surface weather maps, 3-hourly surface winds in Tallahassee, and semi-diurnal balloon soundings to 1,524 meters. Averages of elemental abundances as a function of particle size, determined by proton-induced X-ray emission, PIXE, were computed for a 14-sample set biased towards continental air flow, excluding 12 additional samples where... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1974 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3508 |
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| Van Grieken, R.E.; Johansson, T.B.; Winchester, J.W.. |
| Laboratory experiments were performed using radioactive tracers of <sup>65</sup>Zn, <sup>75</sup>Se, <sup>22</sup>Na, <sup>137</sup>Cs and <sup>152</sup>Eu added to natural sea water to determine differences in elemental composition between sea water and aerosol droplets as a function of particle size. The experiments were conducted using a flow of air as a stream of bubbles rising and bursting at the surface of a vessel containing sea water with added radioactive tracers at pH 8. The resultant aerosol cloud was drawn through a cascade impactor which separated particle size fractions for analysis. In a typical experiment 30 ml of sea water, collected in polyethylene no more than a few hours before... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1974 |
URL: http://www.vliz.be/imisdocs/publications/262479.pdf |
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