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    Comparison of relative INAA and k0-INAA using proficiency test materials at ITU TRIGA Mark II research reactor
    (Springer, 2018) Esen, Ayse Nur; Haciyakupoglu, Sevilay; Erenturk, Sema
    Proficiency testing is an important way of evaluating the analytical method used in the laboratory. In recent years, neutron activation analysis studies performed in ITU TRIGA Mark II reactor comprised five proficiency tests organized by Wageningen evaluating programs for analytical laboratories. In this study, the results obtained by relative INAA and k (0)-INAA method for 16 elements in soil and plant samples are presented. Since both methods have some advantages compared to each other, the possible approach for the laboratory should be to combine relative INAA and k (0)-INAA results.
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    Determining distribution of heavy metal pollution in terms of ecological risk levels in soil of industrially intensive areas around Istanbul
    (Taylor & Francis Ltd, 2015) Haciyakupoglu, Sevilay; Esen, Ayse N.; Erenturk, Sema; Okka, Muhittin; Genceli, Mehmet; Mercimek, Mehmet; Genceli, Esra
    The aims of the present study were to measure the concentrations of As, Cr, Co, Fe, and Zn in soils from two heavily industrialized areas and to assess the degree of heavy metal pollution by using the indices enrichment factor and the geo-accumulation index, as well as assessing the potential ecological risk. The concentrations of the selected elements in the environmental samples were determined by the neutron activation analysis. The pollutant concentrations in the studied areas showed that the soils were characterized by a high pollution from As and Cr due to the industrial facilities in the area. The concentrations in the Tuzla industrial area were 79-1215 mg/kg of Cr, 17-84 mg/kg of As, 22,000-54,000 mg/kg of Fe, 101-258 mg/kg of Zn, and 8-23 mg/kg of Co. The results for the Cerkezkoy industrial area were found to be 46-196 mg/kg of Cr, 6-24 mg/kg of As, 17,000-25,000 mg/kg of Fe, 67-136 mg/kg of Zn, and 7-10 mg/kg of Co. The contamination in the soils from heavy metals was assessed based on enrichment factor, geo-accumulation factors, and ecological risk indices. The results were compared with the data from other industrial areas in Turkey. It was found that the metals As and Cr showed higher concentrations in Tuzla than in other examined industrial areas. The results for Cerkezkoy industrial area indicate that the area is not as contaminated as the other industrial areas in Turkey.
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    Experimental parameters optimization of instrumental neutron activation analysis in order to determine selected elements in some industrial soils in Turkey
    (Pergamon-Elsevier Science Ltd, 2014) Haciyakupoglu, Sevilay; Esen, Ayse Nur; Erenturk, Sema
    The purpose of this study is optimization of the experimental parameters for analysis of soil matrix by instrumental neutron activation analysis and quantitative determination of barium, cerium, lanthanum, rubidium, scandium and thorium in soil samples collected from industrialized urban areas near Istanbul. Samples were irradiated in TRIGA MARK II Research Reactor of Istanbul Technical University. Two types of reference materials were used to check the accuracy of the applied method. The achieved results were found to be in compliance with certified values of the reference materials. The calculated En numbers for mentioned elements were found to be less than 1. The presented data of element concentrations in soil samples will help to trace the pollution as an impact of urbanization and industrialization, as well as providing database for future studies. (C) 2014 Elsevier Ltd. All rights reserved.
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    Feasibility study of k 0-INAA at the ITU TRIGA Mark II research reactor, Turkey
    (Springer, 2016) Esen, Ayse Nur; Haciyakupoglu, Sevilay; Erenturk, Sema; Kubesova, Marie; Kucera, Jan
    This work is focused on testing the implementation of k (0)-INAA using Kayzero for Windows and k0-IAEA software packages at the ITU TRIGA Mark II research reactor. The neutron spectrum parameters were determined using the bare triple-monitor method with Au and Zr monitors. The k (0)-INAA performance was tested by analysis of NIST SRMs 2711 Montana Soil and 1547 Peach Leaves. The performance assessment based on the E (n) criterion showed that the concentrations of a number of elements in both NIST SRMs determined by both software packages are in agreement with NIST values.
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    Kinetic modeling of selenium (IV) adsorption for remediation of contaminated aquatic systems based on meso-scale experiments
    (Desalination Publ, 2015) Haciyakupoglu, Sevilay; Orucoglu, Esra; Esen, Ayse N.; Yusan, Sabriye; Erenturk, Sema
    The present study involves selenium (IV) adsorption onto organic pillared bentonite using batch experiments and kinetic modeling, at two different temperatures. selenium (IV) remediation in an aqueous environment, such as contaminated drinking water, groundwater, and industrial wastewater, is the aim of this study. The experimental data were tested with both surface reaction-based and diffusion-based kinetic models to clarify the controlling mechanism of the adsorption process from both microscopic and macroscopic point of view. Among all the investigated models, the most appropriate was the pseudo-second-order surface reaction-based kinetics model. The obtained results proved that the adsorption process at a selenium dioxide concentration of 300mgL(-1) is controlled by the diffusion rate of penetrated selenium (IV) into the reacted layer.