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Résultats exploitables
Within the present project, a completely new tool for chemical modelling was developed. The simulation program CHEMATA uses experimentally obtained kinetic and mechanistic data of tropospheric VOC oxidation as well as structure-activity relationships for the construction of a chemical mechanism, for the description of smog chamber experiments. The advantage of this new modelling tool compared to currently established mechanisms for tropospheric chemistry is that the program is individually configured for the problem to be solved. Therefore, only the necessary reaction steps are included, which significantly increases the performance of the model.
The technique for the sensitive detection of H02, ER02, NO3 and NO2 concentration-time profiles is the trapping of the trace species by matrix isolation (M1) and analysis of the samples by electron spin resonance (ESR). Ambient air enters the sampling device through a nozzle. The radicals are trapped on a cold finger in a polycrystalline ice matrix at 77K. The matrix is formed by adding heavy water vapOLir to the air jet during sample collection through a stainless steel frit mounted coaxial behind the nozzle. The pressure in the vacuum chamber is kept below 0.1 mbar by a cryopump. The sampling interval is between 15 and 30 min and the sampling efficiency is => 95%. The cryosampler is designed to collect 16 samples on 16 gold-plated copper fingers during the measuring period.
Specification and quantification of the radicals is achieved by ESR spectroscopy. In order to reach an optimum signal to noise ratio the number of scans for each individual sample was 100. The spectra are analyzed with a numerical procedure. The detection limit is 3 ppt for H02, R02 and NO2 and 2 ppt for N03. The accuracy of the method estimated from absolute calibration is 5 + -%.
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