Yazar "Aydin F." seçeneğine göre listele

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    Chromium and thallium in turkish asphaltite sample
    (International Multidisciplinary Scientific Geoconference, 2017) Kavak O.; Aydin F.; Fidan C.; Aydin I.
    Asphaltite derives from petroleum origin solid fossil fuel [1]. It contains valuable elements such as chromium, thallium molybdenum, uranium etc. Chromium and thallium are very important elements both environmental and health. Chromium has an important role in the metabolism. It keeps the blood sugar level in balance. It balances the level of cholesterol. Thallium and its compounds are toxic for humans even at low doses. Poisoning causes death or permanent nervous system disorders. The development of precise and easy determination method for the metals in fuel is essential solving problems due to existence of metals in fuel [2-3]. The aim of this research is to investigate the elemental and proximate analysis of asphaltite samples. In addition, the Chromium, Thallium elements were analyzed by ICP-OES in the asphaltite from Harbul (Sirnak), SE Anatolia-Turkey. Because, Harbul has 25.765.000 tons asfaltite reserves, approximately. It is very important, too. In addition, it can be seen that the proposed ICP-OES procedure is the most simple and reliable analytical method for the elemental analysis of asphaltite due to its high selectivity and low interference problems. © SGEM2017. All Rights Reserved.
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    The clinical and pathological features of patients with gastric cancer in Turkey: A Turkish Oncology Group Study
    (2006) Yalçin B.; Zengin N.; Aydin F.; Ilhan M.; Işikdoğan A.; Demir G.; Aykan F.
    Although the incidence of gastric cancer has declined dramatically in western countries; it is, after the breast cancer in women and lung cancer in men, the second most common cancer in Turkey with a high mortality. Surgery is the mainstay in the management of gastric cancer, and unresectable disease has poor prognosis. The aim of this study was to evaluate the clinicopathological and epidemiological features of patients with gastric cancer in Turkey. A questionnaire was used to collect information on clinicopathological and socioeconomic features of all patients with newly diagnosed gastric cancer in contributing 16 different centers in Turkey in the year 2004. The findings were analyzed by the geographic regions in patients live. Nine-hundred seventy-one patients with newly diagnosed gastric cancer in 2004 were included in the study. Mean age of the patients was 57±12.9 (mean±SD) years. Male-female ratio was 2/1. The rate of cancer resectability was lower in Eastern Turkey (ET) than Western Turkey (WT) (31.6% vs. 63.4%, p=0.0001). Also, socioeconomic status of the patients was lowest in ET (53.6% vs. 32.3%, p=0.0001). H. pylori gastritis and intestinal metaplasia were more common in ET when compared to WT (75.0% vs. 40.5%; p=0.003, and 68.4% vs. 18.1%; p=0.0001, respectively). Lower resectability rate of disease in ET should be appreciated. Further epidemiological study of gastric cancer is warranted in Turkey.
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    Content and mobility behavior of iron and manganese in asphaltite burning residue using ICP-OES
    (Perkin - Elmer Corp., 2014) Aydin I.; Gunduz B.; Aydin F.; Akba O.; Saydut A.; Hamamci C.
    The determination of inorganic pollutants leaching from solid waste, such as coal, asphaltite, oil shale, and ash, is an important topic for industrial applications and solid waste management. This study presents the concentration and fractionation of iron (Fe) and manganese (Mn) in asphaltite burning residue (ABR) and their determination by inductively coupled plasma optical emission spectrometry (ICP-OES). A modified Tessier sequential extraction method was used for the fractionation of Fe and Mn in four forms (exchangeable, carbonates, bound to organic and sulfide, and residual content). Investigations on the Fe and Mn chemical fractions and their environmental mobility in ash solution systems were carried out. It was found that Mn in ABR (from Harbul-Silopi, Turkey) occurs in the following fractions: exchangeable (13.56%), associated with carbonates (28.94%), associated with organic matter and sulfides (17.48%), and residual content (40.08%). Fe occurs in the following fractions: exchangeable (11.11%), carbonates (27.68%), organic matter and sulfides (23.39%), and residual content (37.82%). Among these fractions, the exchangeable and carbonate-bound fractions are unstable and prone to leach out, while the organic matter-bound fractions and the residual fractions are considered to be relatively stable and of low bioavailability. Thw mobility fractions of Fe contain 38.79% and of Mn contain 42.50% of their total concentration in ABR under normal environmental conditions.
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    Determination of stability constants and thermodynamic parameters of some metal complexes with 2-hydroxynaphthalin-1-carbaldehydene 1-naphtylamin
    (2005) Ziyadanoğullari B.; Aydin F.; Şahin E.; Aydin I.; Temel H.
    The thermodynamic parameters of complexes of Cu(II), Ni(II) and Zn(II) cations with hydroxynaphthalin-1-carbaldehydene-1-naphtylamin were determined in 60% (v/v) DMF-water, various ionic strengths (0.07,0.13, 0.2 M NaNO 3) and at different temperatures (25, 30, 35,40 ± 0.1°C) using a spectrophotometric method. The sodium nitrate solution was used to maintain the ionic strengths. The stability constants show an inverse relationship with ionic strengths. The thermodynamic parameters (60% (v/v) DMF-water 60% (v/v) DMF- water (?G0, ?H0, ?S0) based on these formation constants were determined. The acid dissociation constant of ligand was investigated in 60 % (v/v) DMF-water has also been calculated at different temperatures.
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    Effect of homogeneous alkaline catalyst type on biodiesel production from soybean
    (National Institute of Science Communication and Information Resources (NISCAIR), 2016) Saydut A.; Kafadar A.B.; Aydin F.; Erdogan S.; Kaya C.; Hamamci C.
    Transesterification or alcoholysis is the most commonly applied method for biodiesel production. A catalyst is needed to improve the transesterification reaction and yield. The present study used soybean oil as the raw oil to mix with methanol and four strong alkali catalysts (NaOH, KOH, CH3ONa & CH3OK) to undergo a transesterification reaction. Transesterification was carried out using 100% excess alcohol, i.e., molar ratio of alcohol to soybean oil was 6:1, and catalyst concentration of 1% at 60°C. Alkali metal alkoxides were found to be more effective transesterification catalysts compared to hydroxides. Sodium methoxide was the most efficient catalyst, although KOH and NaOH could also be used because they are cheaper and are used widely in large scale processing.
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    Effects of sewage sludge used as fertilizer on heavy metal contents of bird's-foot trefoil (LOTUS CORNICULATUS L.) and soil
    (Chemical Publishing Co., 2012) Saruhan V.; Gul I.; Kusvuran A.; Aydin F.
    This study was carried out to determine the effects of the sludge which was provided from a wastewater refinement facility of Municipality of Diyarbakir on bird's-foot trefoil plant production and its soil properties. For this purpose, the increasing level of sewage sludge has been applied to the soil samples which are taken from the plant rotation field of Dicle University campus area in Turkey and this sludge was left. At the end of study, the chemical properties of the soil have been determined and the results have been compared statistically. In this study three times reiterated randomized blocks design type has been established in the pod to determine the effects of the sludge to the plants and also the mineral content (Hg, Cr, Zn and Ni) of bird's-foot trefoil plant. The sludge that was applied to the soil with increasing amounts, raised the heavy metal content of bird's-foot trefoil plant, but this raising did not line-out for allowable limit.
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    Nickel speciation in asphaltite bottom ash
    (International Multidisciplinary Scientific Geoconference, 2017) Aydin F.; Kavak O.; Fidan C.; Aydin I.
    Asphaltites derive from petroleum origin. The combustion of asphaltites produces fly and bottom ashes that are characterized by a high content of valuable elements such as vanadium, nickel, molybdenum, uranium, thorium, sulfur and unburnt carbon [1]. This study presents the concentration and speciation of nickel in bottom ash of Milli (Sirnak), SE Anatolia in Turkey. Determination of total nickel in asphaltite bottom ash was performed in two stage microwave-acid digestion followed by inductively coupled plasma optical emission spectrometer (ICP-OES). The revised BCR (Commission of the European Communities Bureau of Reference) scheme applied is a four-step sequential extraction procedure. That was proposed to harmonize and validate the methods used in fractionation studies in soils. A four step sequential extraction process to speciation of nickel from asphaltite bottom ash was investigated [2]. Relative abundances of the remaining fractions follow the order: residual >Organic matter and sulfides> exchangeable with water and acid> Iron and manganese oxides soluble. Nickel speciation scheme allows quantitative knowledge of nickel distribution in asphaltite bottom ash and their toxicity, mobility, leachability, bioaccumulation and bioavailability. © SGEM2017. All Rights Reserved.
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    Study of zinc distribution by sequential extraction procedure
    (International Multidisciplinary Scientific Geoconference, 2017) Kavak O.; Aydin I.; Fidan C.; Erek F.; Aydin F.
    Coal bottom ash (CBA) contains many elements that exist in different forms, which may change throughout the coal combustion process. This study presents the concentration and speciation of zinc in bottom ash of coal. Determination of total zinc was performed by two-stage microwave-acid digestion followed by ICP-OES. A sequential extraction process to speciation of zinc from coal bottom ash was investigated [1]. The definition of species is based on several different levels of atomic and molecular structure where chemical forms of the same element are manifest. It can be considered differences at the levels of (i) isotopic composition, (ii) electronic or oxidation state, (iii) inorganic and organic compounds and their complexes, (iv) organometallic species, and (v) macromolecular compounds and complexes. The conventional method of Rauret et al. with modification was used for the sequential extraction [2]. Zinc is an important element for both the living and the environment. In the vital activities of the cell, it plays a role in the functioning of hormones and enzymes. Inhalation is harmful to health. The toxicity effect of zinc is anionic part of its for environmental. This study presents a modified BCR sequential extraction method for the fractionation of zinc (Zn) in CBA into four forms (exchangeable, reducible, oxidizable, and residual) and determination by inductively coupled plasma optical emission spectrometry (ICP-OES). The sample was taken from Karatepe (Sirnak) Turkey. The advantages of the technique include a high degree of automation, good reproducibility, and short analysis time, which makes it the method of choice for the fractionation of Zn. © SGEM2017. All Rights Reserved.