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| Xhoffer, C.. |
| Among the many techniques available at the Micro and Trace Analysis Center (MiTAC) for the observation and analysis of individual particles, electron probe X-ray microanalysis (EPXMA) in combination with multivariate classification techniques allows the most advanced characterization of individual particles in a fast and efficient way. All facilities of EPXMA were used for the source apportionment of more than 25,000 individual aerosol particles detected above the North Sea, the English Channel and the Celtic Sea. The North Sea aerosol is predominantly composed of sea salt, sulfur-rich particles, silicates and calcium sulfate particles. Their abundance is dependent on meteorological conditions and sample location. Differences were studied on the basis of... |
| Tipo: Info:eu-repo/semantics/doctoralThesis |
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| Ano: 1993 |
URL: http://www.vliz.be/imisdocs/publications/226567.pdf |
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| Xhoffer, C.; Wouters, G.; Van Grieken, R.. |
| Five pairs of North Sea bulk waters and their corresponding surface microlayer samples were investigated for their particulate matter content and chemically analyzed and characterized by electron probe X-ray microanalysis and laser microprobe mass analysis. Multivariate techniques as hierarchical and nonhierarchical clustering in association with principal component analysis was performed on a data set containing more than 3,000 individual particles. This classification procedure yielded eight different particle types. Differences in particle type abundances for the microlayer and bulk water were observed. They were apportioned to their most probable sources. The results were compared with atmospheric and riverine particle data. The domination of the major... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1992 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2909 |
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| Xhoffer, C.; Bernard, P.; Van Grieken, R.; Van der Auwera, L.. |
| More than 25,000 individual aerosol particles in 51 particulate matter samples, all taken from a research vessel over the North Sea and the English Channel, in a time range of 4 years, were analyzed by automated electron probe X-ray microanalysis (EPXMA). Multivariate methods were used to reduce the total data set. Single-particle analysis combined with hierarchical cluster analysis yields nine major particle types. The North Sea aerosol is predominantly composed of sea salt, sulfur-rich particles, silicates and calcium sulfate particles. Their abundance is dependent on meteorological conditions and sample location. Differences between all samples were studied on the basis of the abundance variations by using principal component analysis. Three factors... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1991 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2915 |
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