COMPARATIVE-ANALYSIS OF AEROSOLS ELEMENTAL DISTRIBUTION IN SOME ROMANIAN REGIONS

The study's main aim is obtaining aerosols particulate elemental distr ibution and mapping it for some Romanian regions, in order to obtain p reliminary information regarding the concentrations of aerosol particl es and networking strategy versus local conditions. For this we used t he mobile sampling strategy, but taking care on all local specific con ditions and weather. In the summer of 1993, in July we took about 8 sa mples on a rather large territory of SE Romania which were analysed an d mapped. The regions which showed an interesting behaviour or doubts such as Bucharest and Dobrogea were zoomed in near the same period of 1994, for comparing the new details with the global aspect previously obtained. An attempt was made to infer the minimum necessary number of stations in a future monitoring network. A mobile sampler was used, h aving tow polycarbonate filter posts of 8 and 0.4 mu m. PIXE elemental analysis was performed on a 2.5 MV Van de Graaff accelerator, by usin g a proton beam. More than 15 elements were measured. Suggestive 2D an d 3D representations were drawn, as well as histogram charts for the c oncentrations' distribution in the specific regions at the specified t imes. In spite of the poor samples from the qualitative point of view the experiment surprised us by the good coincidence (good agreement) w ith realities in terrain known by other means long time ago, and highl ighted the power of PIXE methods in terms of money and time. Conclusio ns over the link between industry, traffic, vegetation, wether, surfac e waters, soil composition, power plant exhaust and so on, on the one hand, and surface concentration distribution, on the other, were drawn . But the method's weak points were also highlighted; these are weathe r dependencies (especially air masses movement and precipitation), loc al relief, microclimate and vegetation, and of course localisation of the sampling point versus the pollution sources and their regime. The paper contains a synthesis of the whole of the maps and graphs we made , intended in its turn to demonstrate the necessity of a national inte grated network for monitoring aerosols.