Applying size segregation to relate the surrounding aerosol pollution to its source |
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| Authors: | Irena Grgi? Janja Tur?i? Axel Berner |
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| Institution: | (1) Laboratory for Analytical Chemistry, National Institute of Chemistry, Hajdrihova 19, P.O.B. 660, 1001 Ljubljana, Slovenia;(2) Environmental Agency of the Republic of Slovenia, Vojkova 1b, 1000 Ljubljana, Slovenia;(3) Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria |
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| Abstract: | Size segregated sampling of aerosol particles at the coal-fired power station Šoštanj, Slovenia was performed by a newly developed
system. In addition, simultaneous sampling of particles was performed at two locations, Velenje and Veliki vrh, chosen on
the basis of long term monitoring of SO2 in the influential area of power plant. The signature of the power plant (e.g. characteristic size distributions of some
typical trace elements) was identified. For elements, like As, Mo, Cd and Ga, which are typical for coal combustion, the highest
concentrations were observed in the size range between 1 and 4 μm. For Se and sometimes for Ga two modes were identified,
first between 0.1 and 0.5 μm and second between 1 and 4 μm. Ratios between the average concentrations of selected elements
in fine and coarse particles collected at Veliki vrh (the most influenced location) and Velenje (usually not influenced by
the thermo power station) were significantly higher than 1 in the case of Mo and Se for coarse and fine size range, while
for As the ratio was higher than 1 for the coarse fraction. Consequently, Mo, Se and As were found as the most important tracers
for the emissions from the investigated source. On the basis of the ratios between the concentrations of elements measured
in particles at low and high SO2 concentrations at Veliki vrh, Cd was shown to be a typical tracer as well. Our results definitely showed that size segregated
measurements of particles at the source and in the influenced area give more precise information on the influence of source
to the surrounding region. It was found that patterns of size distributions for typical trace elements observed at the source
are found also in the influenced area, i.e. Veliki vrh. |
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