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RESEARCH
Staff
Overview
To establish understanding the chemistry of atmosphere the knowledge about concentration and emission of biogenic and anthropogenic trace gases is important besides the processes in condensed phases (droplets or particles). During different field experiments carbonyl compound emissions from biogenic sources (RAPS98, BEWA2000) and concentrations in rural and urban areas (BERLIOZ, AFS-Stadtaerosol, FEBUKO, ACCENT) as well as concentrations of small hydrocarbons (SANA, HOLME MOSS 99) were determined. Especially for the collection of carbonyl compounds an automated sampling unit and a special HPLC method for the quantification of 29 compounds were developed. A LABVIEW-controlled sampling unit (Figure 1 and 2) was developed and successfully applied.
Besides the extensive determination of organic gaseous trace compounds during nearly all field experiments the inorganic trace gases CO, SO2, O3, and NOx were determined with high time resolution. From these measurements information is available about the status of the environment and rapid changes of atmospheric air masses as well as they can be used for tracers.
The enhancement of the knowledge of atmospheric processes, e.g. homogeneous reaction with radicals like OH, NO3 and ozone, the heterogeneous processes on particle surfaces and in droplets is essentially besides the determination of primary emissions from anthropogenic sources.
The enhancement of the knowledge of atmospheric processes, e.g. homogeneous reaction with radicals like OH, NO3 and ozone, the heterogeneous processes on particle surfaces and in droplets is essentially besides the determination of primary emissions from anthropogenic sources.
Analytical Equipment:
- VOC-Air Analyzer (Chrompack) for NMHC (C2-C9)
- Autochrom-GC (Perkin Elmer) with ATD 400 and Turbomass/FID for volatile organic compounds
- HPLC with rapid-scan-UV/Vis- and fluorescence-detection (Thermoquest) for carbonyl compounds
and polycyclic hydrocarbons (PAH)
- Automatic gas analysers:
- NOx (TE 42C, MLU 200A, Monitor Labs 8841A and 9841A)
- O3 (TE 49C, Monitor Labs 8810 and 9810)
- CO (TE 48C TL, Monitor Labs 9830 and ansyco 11M)
- SO2 (TE 43C TL, Monitor Labs 9850 and ansyco AF 21M)
Fig. 1: Sampling unit for carbonyl
compounds including computer, valve
unit and vacuum pump (from above).
Fig. 2: Valve unit with sampling tubes array during sampling process.
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Field measurements, analytics & process studies
