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  • Küçük Resim
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    Atmospheric ambient trace element concentrations of PM10 at urban and sub-urban sites: source apportionment and health risk estimation
    (Springer, 2018) Bozkurt, Zehra; Gaga, Eftade O.; Taşpınar, Fatih; Arı, Akif; Pekey, Beyhan; Pekey, Hakan; Döğeroglu, Tuncay
    In this study, PM10 concentrations and elemental (Al, Fe, Sc, V, Cr, Mn, Co, Ni, Cu, Zn, As, Se, Mo, Ag, Cd, Sn, Sb, Ba, Pb, and Bi) contents of particles were determined in Duzce, Turkey. The particulate matter samplings were carried out in the winter and summer seasons simultaneously in both urban and sub-urban sampling sites. The average PM10 concentration measured in the winter season was 86.4 and 27.3 mu g/m(3), respectively, in the urban and sub-urban sampling sites, while it was measured as 53.2 and 34.7 mu g/m(3) in the summer season. According to the results, it was observed that the PM10 levels and the element concentrations reached higher levels, especially at the urban sampling site, in the winter season. The positive matrix factorization model (PMF) was applied to the data set for source apportionment. Analysis with the PMF model revealed six factors for both the urban (coal combustion, traffic, oil combustion, industry, biomass combustion, and soil) and sub-urban (industry, oil combustion, traffic, road dust, soil resuspension, domestic heating) sampling sites. Loadings of grouped elements on these factors showed that the major sources of the elements in the atmosphere of Duzce were traffic, fossil fuel combustion, and metal industry-related emissions.
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    Characterization and source estimates of primary and secondary carbonaceous aerosols at urban and suburban atmospheres of Duzce, Turkey
    (Springer Heidelberg, 2019) Kılavuz, Seda Aslan; Bozkurt, Zehra; Öztürk, Fatma
    Duzce is one of the cities located in the western Black Sea region of Turkey with a population of 377,610 in 2017 (TUIK, 2017). There is no satisfying scientific information available to address the contribution of primary and secondary sources of carbonaceous aerosols to the observed PM10 levels in the city. The main objective of the study is to determine the levels and sources of carbonaceous aerosols in PM10. For this purpose, PM10 samples were collected at urban and suburban locations in Duzce during winter and summer season in 2015. Average summer OC and EC concentrations in the urban area were 9.5 and 1.3gm(-3), respectively, while the corresponding concentrations were observed as 28.5 and 2.3gm(-3), respectively for winter season. Summer mean OC and EC levels at the suburban site were 5.46 and 0.37gm(-3), respectively, while those for winter were found as 6.68 and 0.61gm(-3).The contributions of OC and EC to measured PM10 levels were found in the range of 10% to 60% and 1% to 7%, respectively, at the urban station while the associated contributions were in the range of 10% to 50% and 0.6% to 6%, respectively, at the suburban station. The concentrations measured during winter months in both areas were found to be higher than those measured during summer months. The EC tracer method was used in order to estimate the SOC contribution. The contribution of SOC concentrations to the total PM10 mass was found to be higher during winter in the urban area and during summer in the suburban area.
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    Effect of poppy seed meal in broiler diets
    (2006) Bayram, İsmail; Midilli, Mustafa; Bozkurt, Zehra; Karadaş, Erkan; Köken,Tülay
    The present experiment was conducted to determine the effect of rations containing different levels of poppy seed meal (PSM) on BWG, FC, FCR, carcass yield, pathological changes and also some blood parameters in broiler. Totally 480 day old broiler chicks (Cobb) were divided into 6 groups and fed with containing a control (0% PSM) and 5 experimental diets containing different levels (5, 10, 15, 20 and 25%) PSM. Diet containing different levels of PSM significantly (P<0.001) increased in BWG and FC, but did not cause significant change in the FCR and carcass yield; and significantly (P<0.001) reduced the proportional organ weights. Although no significant differences were observed among the groups for cholesterol, trigliseride, AST and ALT levels were found the highest in the PSM (P<0.01). Some pathological lesions in organs of the birds fed different levels of PSM for 42 days were observed.