Browsing by Author "Ivošević, T"

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    Characterization and source apportionment of fine particulate sources at Rijeka, Croatia from 2013 to 2015
    (Elsevier, 2015-03-15) Ivošević, T; Stelcer, E; Orlić, I; Radović, IB; Cohen, DD
    PM2.5 daily aerosol samples were collected in Rijeka, Croatia during period from 6th August 2013 to 29th January 2015. In total, 259 samples were collected on Teflon filters and analyzed by PIXE and PIGE techniques to give information on 21 elements from Na to Pb. Additionally, black carbon was determined with the Laser Integrated Plate Method. Results were statistically evaluated using Positive Matrix Factorization (PMF). Eight major pollution sources: auto, smoke, secondary sulfates, heavy oil combustion, sea spray, road dust, industry iron and soil dust were identified together with their relative contributions in total PM2.5 pollution. © 2015 Elsevier B.V.
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    Comparison between XRF and IBA techniques in analysis of fine aerosols collected in Rijeka, Croatia
    (Elsevier, 2014-10-15) Ivošević, T; Mandić, L; Orlić, I; Stelcer, E; Cohen, DD
    The new system for energy dispersive X-ray fluorescence (EDXRF) analysis has been installed at the Laboratory for Elemental Micro-Analysis (LEMA) at the University of Rijeka. Currently the key application of this new XRF system is in the field of environmental science, i.e. in the analysis of fine airborne particles. In this work, results of initial multi-elemental analysis of PM2.5 fraction is reported for the first time in the region of Rijeka, Croatia. Sampling was performed at the Rijeka City center, during a continuous 9-day period in February/March 2012. All samples were collected on stretched Teflon filters in 12 h periods. To check the reliability of the new XRF system, results of XRF analysis are compared with the results obtained by the well-established Ion Beam Analysis (IBA) laboratory at Australian Nuclear Science and Technology Organisation (ANSTO). The concentrations of H, Na, Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Br and Pb were determined. In addition, black carbon was determined by Laser Integrating Plate Method (LIPM). Very good agreement between XRF and IBA techniques is obtained for all elements detected by both techniques. Elemental concentrations were correlated with the traffic volume and wind speed and direction. The summary of our findings is presented and discussed in this paper. © 2014, Elsevier B.V.
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    Composition and source apportionment of fine particulate matter during extended calm periods in the city of Rijeka, Crotia
    (University of Jyväskylä, Finland, 2016-07-04) Ivošević, T; Cargonja, M; Bogdanović-Radović, I; Orlić, I; Stelcer, E
    In the city of Rijeka, Croatia, an extended, two-year aerosol pollution monitoring campaignwas recently completed. During that period, 345 samples of ne fraction of aerosols were collected on stretched Te on lters. All samples were analyzed by Ion Beam Analysis techniques (PIXE and PIGE) and concentrations of 22 elements were determined. Concentrations of black carbon were determined by Laser Integrated Plate Method. For the Bay of Kvarner, where city of Rijeka is located, common are long periods of calm weather. As a consequence, during these periods, air pollution is steadily increasing. To pin point and characterize local, mostly industrial, air pollution sources, we used only samples collected during the extended calm periods. Speed of 1.5 m/s was used as a cut-o wind speed. In this way, 188 samples were isolated and statistically evaluated by means of Positive Matrix Factorization. The results show that the major, local pollution sources are the following: secondary sulfates, heavy oil combustion, auto, smoke, road dust, industry iron and port activities. As expected, natural components of aerosol pollution such as soil and sea salt are dramatically reduced. Keywords: Fine particles, PM2.5, Ion beam analysis, LIPM, Positive Matrix Factorization, Air pollution sources © The Authors