Options
1991
Book
Titel
Physikalische und chemische Charakterisierung des Waldaerosols
Titel Supplements
Abschlußbericht zum Forschungsvorhaben.
Abstract
As part of recent research on the new type of forest decline physical and chemical investigations to characterize the forest atmosphere were performed in a heavily damaged spruce stand. By means of analytical transmission electron microscopy (ATEM) and energy dispersive X-ray fluorescence spectroscopy (EDXA) the shape and element composition of the aerosol particles were determined. By means of cascade impactors the aerosol were separated into six particle size fractions for each of which inorganic cations and anions were determined. The investigations were focused on the analysis of organic compounds: - Gaseous and particle bound hydrocarbons were qualitatively identified with GC/MS. The quantitative determination was performed by means of gas chromatography with FID- and ECD-detection. - For the analysis of particle bound organic compounds a new thermodesorption procedure was developed. - An automatically working analysis system for analysis of peroxyacetyl nitrate (PAN) was installe d at the measuring site and continous measurements of PAN were performed. Neither the analysis of the gaseous compounds nor the analyses of the particle bound substances seemed to clearly indicate degradation cycles of biogenic substances. A phytotoxic effect of the photo-oxidants seemed not to be probable.