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    Slavica Rajsic

    The aim of this study was to assess PM10 pollution level and estimate required source emission reduction in Belgrade area, the second largest urban center in the Balkans. Daily mass concentrations and trace metal content (As, Cd, Cr, Mn,... more
    The aim of this study was to assess PM10 pollution level and estimate required source emission reduction in Belgrade area, the second largest urban center in the Balkans. Daily mass concentrations and trace metal content (As, Cd, Cr, Mn, Ni, Pb) of PM10 were evaluated for three air quality monitoring sites of different types: urban-traffic (Slavija), suburban (Lazarevac) and rural (Grabovac) under the industrial influence, during the period of 2012-13. Noncompliance with current Air Quality Standards (AQS) was noticeable: annual means were higher than AQS at Slavija and Lazarevac, and daily frequency threshold was exceeded at all three locations. Annual means of As at Lazarevac were about four times higher than the target concentration, which could be attributed to the proximity of coal-fired power plants, and dust resuspension from coal basin and nearby ash landfills. Additionally, levels of Ni and Cr were significantly higher than in other European cities. Carcinogenic health risk of inhabitants' exposure to trace metals was assessed as well. Cumulative cancer risk exceeded the upper limit of acceptable US EPA range at two sites, with Cr and As as the major contributors. To estimate source emission reduction, required to meet AQS, lognormal, Weibull and Pearson 5 probability distribution, functions (PDF) were used to fit daily PM10 concentrations. Based on the rollback equation and best fitting PDF, estimated reduction was within the range of 28-98%. Finally, the required reduction obtained using two-parameter exponential distribution suggested that risks associated to accidental releases of pollutants should be of greater concern.
    Suspended atmospheric particulate matter, PM10 and PM2.5 (aerodynamic diameter less than 10 mum and 2.5 mum) are today a key issue in contemporary air pollution research. Daily aerosol samples were collected at three representative places... more
    Suspended atmospheric particulate matter, PM10 and PM2.5 (aerodynamic diameter less than 10 mum and 2.5 mum) are today a key issue in contemporary air pollution research. Daily aerosol samples were collected at three representative places in the central region of Belgrade in the period of 2002-2005. The results lead to assessment of air quality in urban area of Belgrade.
    Research Interests:
    A pilot study was performed to assess the concentration level of ambient suspended particulate matter PM10 and PM2.5 in the Belgrade urban area. This study has shown theoretical and experimental evidence of pollutants for characteristic... more
    A pilot study was performed to assess the concentration level of ambient suspended particulate matter PM10 and PM2.5 in the Belgrade urban area. This study has shown theoretical and experimental evidence of pollutants for characteristic measurements when maximum PM concentrations occurred. For this study, 60-h air-back trajectories are calculated. When the air masses were coming from the SW direction, the contribution from the complex of coal-fired power plants was evident.
    Research Interests:
    The main purpose of this study was to assess the exceedance frequency of the EU (50 μg m−3) and US EPA (150 μg m−3) daily PM10 limit values, as well as the emission source reduction required to comply with air quality standards. The... more
    The main purpose of this study was to assess the exceedance frequency of the EU (50 μg m−3) and US EPA (150 μg m−3) daily PM10 limit values, as well as the emission source reduction required to comply with air quality standards. The analysis was based on a 10-year (2003–2013) data set obtained for the Belgrade (Serbia) urban area, which is seriously affected by pollution. General probability (Pearson 5, lognormal and Weibull) and extreme value (two-parameter exponential and Gumbel’s) distributions were used to fit data and to estimate the number of exceedances. With the use of best fitting general probability distribution and rollback equation, the required reduction was determined to be in the range of 12 to 98 % for some years, although for others the total reduction of moderate sources would be insufficient to meet air quality regulations. The required emission reduction of strong sources for the whole monitoring period was estimated by means of extreme value distributions at abo...
    The concentrations of VOCs (obtained by PTR-MS), ethylbenzene, xylene, NOx, NO, NO2, SO2, CO and meteorological parameters were measured at Belgrade (Serbia) urban site during winter 2014. US EPA Unmix receptor model was applied on... more
    The concentrations of VOCs (obtained by PTR-MS), ethylbenzene, xylene, NOx, NO, NO2, SO2, CO and meteorological parameters were measured at Belgrade (Serbia) urban site during winter 2014. US EPA Unmix receptor model was applied on obtained dataset resolving six emission sources and their contributions to urban air pollution. The dynamics of traffic source contribution and its variation with meteorological parameters were analyzed. The results showed that the urban site is strongly influenced by traffic-related emissions with average contribution of 26%.
    During a two-month campaign in winter 2014, the concentrations of VOCs were measured by Proton Transfer Reaction Mass Spectrometer (PTR-MS) together with other air pollutants (NOx, NO, NO2, SO2 and CO) and meteorological parameters in... more
    During a two-month campaign in winter 2014, the concentrations of VOCs were measured by Proton Transfer Reaction Mass Spectrometer (PTR-MS) together with other air pollutants (NOx, NO, NO2, SO2 and CO) and meteorological parameters in Belgrade (Serbia) urban area. US EPA Unmix receptor model was applied resolving six source profiles. The profile with the third largest an average contribution of 12.8% was attributed to chemical industry. The spatio-temporal variations of source contributions and the impact of meteorological parameters were analyzed by Openair software. As shown, the air pollution from petrochemical complex located in Pančevo has a noticeable impact on air quality of Belgrade urban area.
    Active biomonitoring of air quality in Belgrade, Serbia, was performed using the moss Sphagnum girgensohnii. Moss bags were exposed in parallel with and without irrigation respectively for four consecutive 3-month periods at three urban... more
    Active biomonitoring of air quality in Belgrade, Serbia, was performed using the moss Sphagnum girgensohnii. Moss bags were exposed in parallel with and without irrigation respectively for four consecutive 3-month periods at three urban sites. Twenty-nine elements were determined in the exposed moss samples by ENAA and three (Cu, Cd, and Pb) by AAS. The relative accumulation factor (RAF) was
    ABSTRACT In this study, the concentrations of volatile organic compounds were measured by the use of proton transfer reaction mass spectrometry, together with NO x , NO, NO2, SO2, CO and PM10 and meteorological parameters in an urban area... more
    ABSTRACT In this study, the concentrations of volatile organic compounds were measured by the use of proton transfer reaction mass spectrometry, together with NO x , NO, NO2, SO2, CO and PM10 and meteorological parameters in an urban area of Belgrade during winter 2014. The multivariate receptor model US EPA Unmix was applied to the obtained dataset resolving six source profiles, which can be attributed to traffic-related emissions, gasoline evaporation/oil refineries, petrochemical industry/biogenic emissions, aged plumes, solid-fuel burning and local laboratories. Besides the vehicle exhaust, accounting for 27.6 % of the total mixing ratios, industrial emissions, which are present in three out of six resolved profiles, exert a significant impact on air quality in the urban area. The major contribution of regional and long-range transport was determined for source profiles associated with petrochemical industry/biogenic emissions (40 %) and gasoline evaporation/oil refineries (29 %) using trajectory sector analysis. The concentration-weighted trajectory model was applied with the aim of resolving the spatial distribution of potential distant sources, and the results indicated that emission sources from neighbouring countries, as well as from Slovakia, Greece, Poland and Scandinavian countries, significantly contribute to the observed concentrations.
    In order to assess the level of mass concentrations of ambient suspended particles PM10 and PM2.5, a pilot study was performed in the urban area of Belgrade, in winter and summer period from June 2002 to June 2003. The PM10 mass... more
    In order to assess the level of mass concentrations of ambient suspended particles PM10 and PM2.5, a pilot study was performed in the urban area of Belgrade, in winter and summer period from June 2002 to June 2003. The PM10 mass concentrations in Belgrade urban area were high (average value being 72 µg m-3) in comparison to other European cities
    An extensive study on urban aerosols with the aim to determine the sources and provide a physico-chemical description of PM, present in the urban air of Belgrade, was performed. Air aerosol samples for PM10and PM2.5and trace metals were... more
    An extensive study on urban aerosols with the aim to determine the sources and provide a physico-chemical description of PM, present in the urban air of Belgrade, was performed. Air aerosol samples for PM10and PM2.5and trace metals were collected during June 2002 to July 2005 at representative locations in urban Belgrade area. Mass concentrations of PM10and PM2.5were determined gravimetrically, concentrations
    Sixty‐six 24‐hour precipitation samples were collected in Antwerp, Belgium and analyzed for pH and major ions. The samples were strongly acidic with a volume weighted average pH of 4.07. The results of stoichiometric ratios and regressive... more
    Sixty‐six 24‐hour precipitation samples were collected in Antwerp, Belgium and analyzed for pH and major ions. The samples were strongly acidic with a volume weighted average pH of 4.07. The results of stoichiometric ratios and regressive analysis indicate that the free acidity is mostly due to sulfuric and nitric acid. The observed neutralization of strong acids can mainly be attributed to ammonia. The chloride ion is one of the major ions in precipitation; it originates largely from marine aerosols and does not influence significantly the acidity.
    In 1996 and 1997 horse chestnut (Aesculus hippocastanum L.) and Turkish hazel (Corulys colurna L.) leaves were sampled at 2 m height in the Belgrade Botanic Garden, located in an urban area with heavy traffic. Using a scanning electron... more
    In 1996 and 1997 horse chestnut (Aesculus hippocastanum L.) and Turkish hazel (Corulys colurna L.) leaves were sampled at 2 m height in the Belgrade Botanic Garden, located in an urban area with heavy traffic. Using a scanning electron microscope with an energy dispersive X-ray spectroscopy (SEM-EDAX), the size, size distribution, morphology and chemical composition of individual particles were examined on the adaxial and abaxial surfaces of leaf discs of both species. The majority of particles observed on leaves belonged to a class of fine particles (D < 2 microm). Morphological and chemical composition indicated that the most abundant particles were soot and dust with minor constituents such as Pb, Zn, Ni, V, Cd, Ti, As and Cu. Using an electrochemical technique (DPASV), it was possible to measure trace metal concentrations (Pb, Cu, Zn) in a water-soluble fraction of deposits on each single leaf. Trace metal contents in the leaf deposits, increased during the vegetation period for both species and were considerably higher in A. hippocastanum due to different epidermal characteristics. The higher trace metal concentrations in deposits in 1997 reflected greater atmospheric pollution in the Belgrade urban area.