Yazar "Kavak O." 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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    Geochemical methods to investigate the hydrocarbon seepage samples in Adiyaman a southeastern province of Turkey
    (University of Tehran, 2015) Önen K.; Yilmaz M.A.; Dicle Y.; Kavak O.; Temel H.
    The southeastern part of Turkey is quite rich, fertile and mature in terms of hydrocarbon seepages. While the use of the related sources meet the energy demand, it damages the environment and human health. In this study, several geochemical methods were applied to analyze the hydrocarbon sepage samples obtained from seven towns in the province of Adiyaman where is very close to the oil production areas and located in the Southeastern part of Turkey. First of all, Total Organic Carbon (TOC), Rock Evil Paralysis, Gas Chromatography (GC) and Gas Chromatography Mass Spectrometry analyses (GC – MS) were performed for the samples in question. In the light of these results, oil/bitumen mechanisms, source rock correlations, formation and migration mechanisms of the related geological environments were found. Then, Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) analysis of Fe, Al, Mn, Mn, Zn, B, Pb, Ni, Cu metals were performed. Chemical and mineralogical features of the samples were investigated by IR and combined with ESR spectra. The samples display typical ESR spectra of Mn+2 ions hyperfine sextet whose last line was used to check the stones homogenity with respect to manganase content. In this study, heavy metal pollution and hydrocarbon compounds were determined to damage the environment and several suggestions were made to overcome the pollution and to enhance the productivity. © 2015, University of Tehran. All Rights Reserved.
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    Geological and architectural investigation of reused rock columns in the great mosque in diyarbakir old city (Turkey)
    (Henan University, 2011) Kavak O.; Dalkiliç N.; Toprak V.
    Cylindrical rock columns in the Great Mosque in Diyarbakir Old City are investigated for their lithology and architecture. The columns belong to four different rock types, namely pre-Tertiary meta-ophiolites, Eocene limestones, Miocene limestones and Plio-Quaternary basalts. The columns from the first three lithologies are reused during the construction and/or renovation of the Great Mosque. Thin sections prepared from 18 columns of this building confirm they are derived from the rocks exposed in the region. The reuse of the columns is approved by inconsistent column lengths, multi-segment column shafts, lithologically mixed columns and presence of thin wedges at the bottom of column bases. These columns are not used to support the main body but rather either for partial support or only for decorative reasons. © 2011 MAA Printed in Greece. All rights reserved.
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    Insights into aromatic organosulphur compounds in solid bitumen and heavy oils from southeast Turkey
    (European Association of Geoscientists and Engineers, EAGE, 2019) Hosseini S.H.; Poetz S.; Horsfield B.; Wilkes H.; Kavak O.; Yalçın M.N.
    [No abstract available]
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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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    Organic geochemical and petrographic properties of gölbaşı harmanlı (Adıyaman) coals
    (TMMOB - Jeoloji Muhendisleri Odasi, 2011) Kavak O.; Toprak S.
    This study was carried out in Gölbaşi{dotless}-Harmanli{dotless} (Adi{dotless}yaman) region where coal basin exists. Chemical, petrographical and organic geochemical analyses of the Tertiary aged coals were taken into consideration. Coal quality investigation along with proximate (moisture, volatile matter, fixed carbon, ash) and elemental analyses (C, H, O, S, N) were performed. The huminite reflectances of organically abundant matter and coal levels were found to be between 0.28% and 0.516% which refer to low maturity levels. This parameter is compatible with fluorescence colors, calorific value (average original 2736 - dry 3727 Kcal/kg) and average Tmax (422 °C). Organic matters of the investigated coals exhibit a low grade transformation, due to a low lithostatic pressure on them. In GC analyses, n-alkanes with low carbon numbers as n-C17, n-C27, n-C30 and n-C3 and CS2 as well as benzen were detected. Triterpanoid component was determined with GC-MS data and tends to imply high ground continental vegetation, but gammacera values to hypersaline depositional conditions. Gölbaşi{dotless} coals show sub-bituminous and lignite coalification ranks. Rock Eval analysis results show TYPE II/III and III kerogen, with average Tmax value is 422 °C, and corresponding to the immature and premature rank for hydrocarbon generation. The coals are characterised with their abundance of huminite maceral group with small amount of inertinite and liptinite macerals. Mineral matters of the Gölbaşi{dotless} coals are calcite, clays, and sulfur bearing minerals.
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    Organic geochemical properties of adiyaman golbasi (south east of Turkey) coals
    (2011) Kavak O.; Toprak S.
    This study was carried out in Golbasi (Adi{dotless}yaman) region (SE of TURKEY), which owns rare coal formations in the region. Chemical, petrographic analysis and organic geochemical evaluations of the Tertiary aged coals were taken into consideration. Coal quality investigation along with proximate (moisture, volatile matter, fixed carbon, ash) and elemental analyses (C, H, O, S, N) were performed and revealed. The huminite reflectance of organically abundant matter and coal levels were found to be between 0.30 and 0.52% which refer to lower maturity levels. This parameter is compatible with fluorescence colors, calorific value (average original 2736 - dry 3727 Kcal/kg) and average Tmax (422 °C). Organic matters of the investigated coals exhibit a low grade transformation, due to a low lithostatic pressure on them. Golbasi coals show low grade maturity and own sub-bituminous and lignite coalification ranks. Rock Eval analysis results show that TYPE II/III and III kerogen, with average Tmax values is 422 °C and corresponding to the immature and premature rank for hydrocarbon generation. The coals are characterized with their abundance of huminite maceral group and gelinite maceral, with small amount of inertinite and liptinite macerals. The coals were deposited in a lake environment and were supposed to form as a hypautochtonous way. Mineral matters of the Golbasi coals are clay, calcite and sulfur minerals. © SGEM2011 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM.
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    Organic geochemical properties of bingol Karliova (East of Turkey) coals
    (2012) Kavak O.; Toprak S.
    This study was carried out in Halifan (Bingol) region (East of TURKEY), which owns a unique coal formation in the region. Chemical, petrographic analysis and organic geochemical evaluations of the Tertiary aged coals were taken into consideration. Coal quality investigation along with proximate (moisture, volatile matter, fixed carbon, ash) and elemental analyses (C, H, O, S, N) were performed and revealed. The huminite reflectances of organically abundant matter and coal levels were found to be between 0.368 and 0.573% which refer to lower maturity levels. This parameter is compatible with fluorescence colors, calorific (average 2736 (original) - 3727 (dry) Kcal/kg) and average Tmax (417°C) values. Organic matters of the investigated coals exhibit predominantly medium grade transformation, due to the extensively effective main faults in the region. Halifan coals show low-medium grade maturity and own subbituminous and lignite coalification ranks. Rock Eval analysis results show that TYPE II/III and III kerogen, with average Tmax values is 417°C and corresponding to the immature and premature rank for hydrocarbon generation. The coals are characterised with their abundance of huminite maceral group and gelinite maceral, with small amount of inertinite and liptinite macerals. The coals were deposited in a lake environment. Mineral matters of the Bingol Karliova coals are clays, quartz and feldspar minerals. © SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM.
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    The second paleozoic coal of Turkey, Diyarbakir-Hazro coals and their properties
    (2012) Kavak O.; Toprak S.
    This study was carried out in Hazro-Diyarbakir region (SW of Turkey), which owns a very unique coal formation. Aside from Zonguldak region (NW of Turkey), Paleozoic coal formations are very rare in Turkey. Hazro region comprises the oldest units of the region which was outcropped due to a considerably spectacular form of an anticline. Diyarbaki{dotless}r-Hazro occurrences are outcropped within the Hazro anticline. The anticline was emerged through a vast Tertiary Basin in the area. Gomaniibrik Formation, of Upper Permian age, is the main formation of the region. The formation which contains of shale, sandstone succession and is of lacustrine type formation comprises of two important coal levels. Chemical and petrographic analyses of the coals were taken into consideration. Coal quality investigation along with proximate (moisture, volatile matter, fixed carbon, ash) analyses were performed and revealed. The coals herein, as a result of conducted detail prospects and drills, comprises of 0.2 - 1.9 meter thickness, 1.2% moisture, 30% ash, 5100 Kcal/kg calorific value and 2.3 million total reserve. The vitrinite (huminite) is the most common maceral and its reflectances (Rmax) were found to be between 0.46 and 1.14% which refer to medium maturity levels. The coals seem to show sub-bituminous to bituminous coal ranks. The mineral matters of the Hazro coals are mostly clays, calcite and pyrite. © SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM.
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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.