Demirtepe, Hale
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Demirtepe, H
Demirtepe, H.
Demirtepe, H.
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Email Address
haledemirtepe@iyte.edu.tr
Main Affiliation
03.07. Department of Environmental Engineering
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Current Staff
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Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
1
Research Products
3GOOD HEALTH AND WELL-BEING
5
Research Products
4QUALITY EDUCATION
0
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
2
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7AFFORDABLE AND CLEAN ENERGY
1
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8DECENT WORK AND ECONOMIC GROWTH
0
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
3
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
1
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
4
Research Products
13CLIMATE ACTION
0
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14LIFE BELOW WATER
3
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15LIFE ON LAND
2
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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17PARTNERSHIPS FOR THE GOALS
0
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Documents
13
Citations
266
h-index
9
Documents
11
Citations
220
Scholarly Output
10
Articles
4
Views / Downloads
3435/1881
Supervised MSc Theses
4
Supervised PhD Theses
0
WoS Citation Count
28
Scopus Citation Count
30
Patents
0
Projects
3
WoS Citations per Publication
2.80
Scopus Citations per Publication
3.00
Open Access Source
1
Supervised Theses
4
| Journal | Count |
|---|---|
| Environmental Pollution | 1 |
| Environmental Science: Processes & Impacts | 1 |
| Handbook of Research on Emerging Developments and Environmental Impacts of Ecological Chemistry | 1 |
| Journal of Advanced Research in Natural and Applied Sciences | 1 |
| Science of the Total Environment | 1 |
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10 results
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Now showing 1 - 10 of 10
Article Citation - WoS: 2Citation - Scopus: 2Surface Sediments as a Sink and Risk Source for Legacy Pops During Waste Management Practices(Elsevier Sci Ltd, 2025) Demirtepe, HalePersistent organic pollutants (POPs) such as polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are globally recognized contaminants due to their persistence, bioaccumulative properties, and toxicity. Despite regulatory efforts, these compounds continue to enter the environment through improper waste management practices, including shipbreaking activities. This study investigates the PCB and PBDE contamination of marine sediments along a 30 km coastline in Aliaga, T & uuml;rkiye, involving one of the world's largest shipbreaking yards. Sixteen surface sediment samples were analyzed for 46 PCB and 23 PBDE congeners. The results revealed Sigma 46PCBs ranging from 5.17 to 4750 ng/g and Sigma 23PBDEs from non-detectable to 5053 ng/g. Shipbreaking activities exhibited the highest concentrations, while the sediments sampled close to beaches had the lowest POP contamination. Source apportionment using principal component analysis (PCA) identified distinct contamination patterns, associating higher-chlorinated PCBs with shipbreaking and lower-chlorinated PCBs and PBDEs with land-based industrial emissions and urban runoff. Ecological risk evaluation showed that most sediment samples exceeded sediment quality guidelines, with some PCB and PBDE congeners posing moderate to high risks to benthic ecosystems. Particularly, PCBs 28 and 52 exhibited low to high risk for almost all sediment samples. This study emphasizes the urgent need for improved waste management practices, particularly for POP-containing materials, to mitigate ecological risks. Shipbreaking yards are identified as hotspots for legacy POP contamination, necessitating international collaboration and stricter enforcement of environmental regulations as shipbreaking operations encompass cross-country transfer of wastes. Findings highlight the critical importance of remediation strategies to protect marine environments.Master Thesis Remediation of Heavy Metals in Top Soils of Aliağa Region(2023) Baştuğ, Muhammed; Demirtepe, Hale; Ökten, Hatice EserPhytoremediation using energy crops provides the opportunity to achieve soil remediation and bio-based energy production simultaneously. However, there is limited information in the literature comparing the potential of different energy plants to remove multiple heavy metals. In this study, safflower (Carthamus tinctorius), canola (Brassica napus), and common reed plants (Phragmites australis), known as energy crops in the literature, were used to investigate their potential for removing multiple heavy metals in the surface soil of Izmir Aliağa region, the surface soil of Kozak Plateau and a mixture soil. The heavy metal removal efficiencies of plants, heavy metal accumulation in the roots and aboveground parts, bioconcentration factors (BCF), translocation factors (TF), biomass production, and soil properties on heavy metal uptake were investigated. As a result, plants generally produced more biomass in the soil with the highest heavy metal concentration and highest organic matter. More accumulation was observed in the roots of all three plants in the study. When BCF and TF were examined, it was revealed that plants mostly showed phytostabilizer properties for the heavy metals studied. Except for Pb, heavy metal concentrations in soil were reduced as a result of phytoremediation. Additionally, when the three plants were compared, safflower was proposed to be the most suitable plant for phytoremediation due to its high potential for multiple heavy metal remediation and high tolerance to drought. To conclude, phytoremediation using energy crops proved to be a sustainable technique by providing concurrent heavy metal removal and energy production.Book Part Impacts of Remediation of Halogenated Organic Compounds in Soils and Sediments(IGI Global, 2019) Demirtepe,H.Halogenated hydrophobic organic compounds (HOCs) have been used in various industrial applications and are present in many commercial products. Due to their emissions during manufacturing and discharges as wastes, halogenated HOCs such as polychlorinated biphenyls and polybrominated diphenyl ethers are ubiquitously found in the environment and create contaminated sites. To remove the contamination from these sites, various remediation techniques have been useful. The purpose of this chapter is to investigate the impacts of traditional and emerging remediation techniques on ecosystem. One of the traditional remediation techniques is dredging and the mostly studied emerging remediation techniques are bioaugmentation and biostimulation. The efficiency of these techniques is also evaluated regarding reduction in contaminant mass. Overall, this chapter presents the efficiency and possible impacts of dredging, bioaugmentation and biostimulation of soils and sediments, and the implications include the evaluation of most feasible remediation techniques by using life cycle assessment. © 2020 by IGI Global. All rights reserved.Article Citation - WoS: 1Citation - Scopus: 1Understanding the Role of a Specific Microenvironment in Personal Exposure To Semi-Volatile Organic Compounds Using Silicone Wristbands(Royal Soc Chemistry, 2025) Akmermer, Zulfikar; Demirtepe, HaleAssessment of personal exposure to semi-volatile organic compounds was facilitated using silicone wristbands (SWBs), an easy-to-use sampler that reflects total inhalation and dermal exposure from all the microenvironments and the activities in which the user was involved. Hence, SWBs help understand exposure from various routes, activities, and microenvironments. Offices are critical microenvironments where workers spend one-third of their daily time on weekdays; hence exposure from offices should be more extensively studied. This study aimed to investigate the personal exposure of university personnel and elaborate on the contribution of the exposure due to the office air to their overall exposure using SWBs. One SWB was worn by the participant, and another was hung in their office. After seven days of sampling on the wrist, exposure to polycyclic aromatic hydrocarbons (PAHs) was found to be related to combustion activities at home or from open fire, whereas exposure to organophosphate esters and phthalates was suggested to originate from building materials, such as flooring materials and paints, and consumer products, e.g. mattresses and furniture. PAHs in the participants' offices were influenced by the transport of outdoor air and phthalates from the ceiling material. Then, we estimated the equivalent air concentrations using the SWBs sampled from the offices and previously developed sampling rates and partition coefficients. The estimated office air exposure contributions to total inhalation and dermal exposure were 83%, 51%, and 39% for fluorene, tri(n-butyl) phosphate, and tris(2-chloro isopropyl) phosphate, respectively. These findings were consistent with the statistical analysis of personal data. To conclude, this study highlighted the importance of specific microenvironments in our exposure to particular SVOCs, offering strategies for indoor air quality management and human health risk assessment.Master Thesis Investigation of a Novel Personal Sampler Material for the Identification of Human Exposure To Semivolatile Organic Compounds(2024) Akmermer, Zülfikar; Demirtepe, Hale; Sofuoğlu, Sait CemilSVOCs are widespread indoors, where they occur at high levels. Humans spend most of their time indoors and are regularly exposed to these compounds. Various methods exist to assess human exposure to SVOCs. However, a novel personal sampler material, i.e. silicone wristband, has been used for the last decade. Due to its commencing use, the uptake capacity of silicone wristbands for SVOCs still needs to be discovered. This study aims to investigate the SVOC uptake rate and equilibrium partitioning coefficients of silicone wristbands. To achieve this aim, an analysis method for determining SVOCs in silicone wristbands was developed and validated with wristbands worn by academic personnel of IZTECH. The results showed that among polycyclic aromatic hydrocarbons (PAHs) acenaphthylene, among organophosphate esters (OPEs), tris (2-butoxyethyl) phosphate and among phthalate esters, di(2- ethylhexl) phthalate were found as the dominant SVOCs in silicone wristbands. Then, the uptake capacity of silicone wristbands for PAHs was investigated by deploying them in a school environment for 36 days, together with polyurethane foam passive air samplers. The uptake rates varied three orders of magnitude for compounds reaching equilibrium, i.e. acenaphthene, acenaphthylene, fluorene, phenanthrene, and anthracene (0.010 – 25.93 m3/day), while for fluoranthene, chrysene, and pyrene uptake rates were close to each other (0.17 – 0.50 m3/day). Furthermore, silicone wristband-air partitioning coefficients were in the range of 5.93 to 7.43 for acenaphthene, acenaphthylene, fluorene, phenanthrene, and anthracene. Lastly, daily and chronic toxic exposures and lifetime cancer risk for school children were assessed using PUF-PAS concentrations, and no significant risk was identified.Master Thesis Bioremediation of Marine Sediments Contaminated by a Mixture of Persistent Organic Pollutants(01. Izmir Institute of Technology, 2025) Kurtoğlu, Miray; Demirtepe, Hale; Ökten, Hatice EserPoliklorlu bifeniller (PCBs) ve polibromlu difenil eterler (PBDEs) gibi kalıcı organik kirleticiler, çevrede karışım halinde bulunarak ekosistem ve insan sağlığı için önemli riskler oluşturur. Bu küresel sorunun çözümü bu kirleticilerin çevresel ortamlardan uzaklaştırılması, yani iyileştirilmesidir. Bu çalışma, endüstriyel faaliyetlerin yoğun olduğu Aliağa, İzmir, Türkiye'deki gemi söküm sahalarından alınan kirlenmiş sedimanlar kullanılarak, biyoogmentasyon (BO) ve biyostimulasyon (BS) gibi biyoiyileştirme stratejilerinin etkinliğini sediman mikrokozmları ile incelemiştir. Mikrobiyal analizler, sedimanlarda Chloroflexi filumu ile ilişkili mikroorganizmaların çokluğunu (%37,6) ortaya koymuştur ve bu mikroorganizmalar zenginleştirilerek BO uygulaması için kullanılmıştır, BS uygulamasında ise doğal mikrobiyal aktiviteyi teşvik etmek amacıyla ortama mikrobesinler sağlanmıştır. BO ve BS, toplam PCB'ler için sırasıyla %14 ve %19, PBDE'ler için ise %33 ve %24 olarak giderim verimlilikleri sağlamış; bu değerler, doğal giderim (PCB'ler için %12 ve PBDE'ler için %8) setine kıyasla daha iyi performans gösterdiği için harici katkıların önemini kanıtlamıştır. PCB'ler için bozunma hızları BO'da (0,00124 klor/bifenil/gün-Cl/bp/gün) BS'den (0,00085 Cl/bp/gün) daha yüksek iken, PBDE'lerin bozunma hızı BS'de (0,00945 brom/difenil eter/gün-Br/dp/gün) BO'ya (0,00741 Br/dp/gün) kıyasla daha hızlı olmuştur. BO ve BS stratejileri toplam PCB ve PBDE konsantrasyonlarını azaltmış olsa da, zamanla daha düşük halojenli bileşiklerin oluşumu ekotoksikolojik riski işaret etmiştir. PCB-52 sürekli olarak yüksek risk sergilerken, BDE-28 BS'de yüksek risk kategorisine çıkmış ve BDE-153 tüm uygulamalarda yüksek ve orta risk seviyeleri arasında değişiklik göstermiştir. Bu bulgular, in situ biyoiyileştirme uygulamalarından önce laboratuvar ölçekli çalışmaların yapılmasının, giderim verimliliği ve potansiyel riskleri değerlendirme açısından önemini ve gerekliliğini vurgulamaktadır.Book Part Impacts of Remediation of Halogenated Organic Compounds in Soils and Sediments(IGI Global, 2022) Demirtepe, HaleHalogenated hydrophobic organic compounds (HOCs) have been used in various industrial applications and are present in many commercial products. Due to their emissions during manufacturing and discharges as wastes, halogenated HOCs such as polychlorinated biphenyls and polybrominated diphenyl ethers are ubiquitously found in the environment and create contaminated sites. To remove the contamination from these sites, various remediation techniques have been useful. The purpose of this chapter is to investigate the impacts of traditional and emerging remediation techniques on ecosystem. One of the traditional remediation techniques is dredging and the mostly studied emerging remediation techniques are bioaugmentation and biostimulation. The efficiency of these techniques is also evaluated regarding reduction in contaminant mass. Overall, this chapter presents the efficiency and possible impacts of dredging, bioaugmentation and biostimulation of soils and sediments, and the implications include the evaluation of most feasible remediation techniques by using life cycle assessment.Article Soil Contamination by Metals/Metalloids Around an Industrial Region and Associated Human Health Risk Assessment(2024) Demirtepe, HaleIndustrial, agricultural, transportation, and waste management activities cause soil contamination by metals/metalloids. Soil contamination is an essential global concern since it poses a significant risk to human health. Particularly in areas near heavy industry, people are more prone to exposure. This study aims to determine current metal/metalloid contamination levels in soil from Aliağa industrial region and assess associated health risks. Five surface soil samples were collected from the region, representing residential, agricultural areas, and downwind of possible sources. Pollution indices were calculated to determine the metal(loid)s with anthropogenic inputs, and a human health risk assessment was conducted. As a result, significant to extreme enrichment of arsenic (As), moderate to significant enrichment of zinc (Zn) and manganese (Mn), and very high enrichment of lead (Pb) and cadmium (Cd) were observed in soil samples. Possible sources of contamination were iron and steel facilities with electric arc furnaces and oil combustion. Non-carcinogenic risk assessment revealed acceptable risks of exposure to Aliağa soils, while exposure scenarios had a great impact on estimated risks. Arsenic, chromium (Cr), and Pb appeared to be significant contributors to non-carcinogenic risk. Carcinogenic risks associated with exposure to As, Pb, Cr, cobalt (Co), and Cd in soils were evaluated to be at an acceptable level. This study only considered soil exposure pathways; hence, a comprehensive risk assessment is deemed necessary not to underestimate the risk of living around an industrial region. Nevertheless, the study provided crucial information for the current hot spots for metal(loid)s in the region and human exposure level.Article Citation - WoS: 25Citation - Scopus: 27Targeted and Suspect Screening of Plasticizers in House Dust To Assess Cumulative Human Exposure Risk(Elsevier, 2021) Demirtepe, Hale; Melymuk, Lisa; Codling, Garry; Murinova, Lubica Palkovicova; Richterova, Denisa; Rasplova, Vladimira; Trnovec, TomasIndoor dust is an important exposure route to anthropogenic chemicals used in consumer products. Plasticizers are common product additives and can easily leach out of the product and partition to dust. Investigations of plasticizers typically focus on a subset of phthalate esters (PEs), but there are many more PEs in use, and alternative plasticizers (APs) are seeing greater use after recognition of adverse health effects of PEs. In this study we use full scan high resolution mass spectrometry for targeted and suspect screening of PEs and APs in house dust and to assess the potential risk of human exposure. House dust samples from Eastern Slovakia were investigated and concentrations of Sigma 12PEs and Sigma(5)APs ranged 12-2765 mu g/g and 45-13,260 mu g/g, respectively. APs were at similar levels to PEs, indicating common usage of these compounds in products in homes. Evaluation of individual compound toxicity combined with human intake via dust ingestion suggested PEs are of lower priority compared to semivolatile organic compounds such as polychlorinated biphenyls due to their lower toxicity. However, cumulative risk assessment (CRA) is a more appropriate evaluation of risk, considering the presences of many PEs in dust and their similar toxic mode of action. CRA based on median toxicity reference values (TRVs) suggested acceptable risks for dust ingestion, however, the wide range of literature-derived TRVs is a large uncertainty, especially for the APs. Use of newer TRVs suggest risk from dust ingestion alone, i.e. not even considering diet, inhalation, and dermal contact. Additionally, screening of full-scan instrumental spectra identified a further 40 suspect PE compounds, suggesting the CRA based on the 12 target PEs underestimates the risk. (C) 2021 Elsevier B.V. All rights reserved.Master Thesis Bioremediation of Sediments Contaminated by Persistent Organic Pollutants: an In-Silico Approach(01. Izmir Institute of Technology, 2024) Yıldırım, Batuhan; Demirtepe, Hale; Ökten, Hatice EserBromlu alev geciktiriciler arasında en yaygın kullanılanlardan biri olan polibromlu difenil eterler (PBDE), çevre ve insan sağlığı üzerinde ciddi riskler oluşturan kalıcı organik kirleticiler olarak bilinmektedir. Bu nedenle, bozunma süreçleri ile çevresel ortamlardan giderilmeleri gerekmektedir. Fakat, karmaşık çevresel ortamlarda bozunmanın ilerleyişini takip etmek zordur. Bu sebeple, PBDE'lerin bozunma süreçlerini anlamak ve etkili iyileştirme yöntemleri geliştirmek için modelleme çalışmaları gereklidir. Bu çalışma, PBDE'lerin sedimanlardaki anaerobik dehalojenasyonunu modellemek ve iyileştirme senaryoları altında bozunma yollarını ve bozunma hızlarını analiz etmeyi amaçlamaktadır. Bu amaçla, doğal giderim, biyostimulasyon ve biyoogmentasyon senaryolarını taklit eden bir mikrokozm çalışmasının deneysel verileri kullanılmıştır. Daha önce geliştirilmiş olan anaerobik dehalojenasyon modeli (ADM), geliştirilip entegre edilerek 'ADM-IE' adı verilen yeni bir model oluşturulmuştur. ADM-IE, PBDE bozunması için tüm olası dehalojenasyon yollarını listeleme, bu yolların reaksiyon miktarlarını belirleme, ölçülen bileşikler için bozunma hız sabitlerini hesaplama ve ölçülmeyen bileşikler için makine öğrenimi algoritmalarıyla hız sabitlerini tahmin etme yeteneklerine sahiptir. Sonuç olarak, modelin yüksek konsantrasyonlu bileşikler için daha başarılı tahminler yaptığını, ancak düşük konsantrasyonlu bileşikler için tahmin doğruluğunun daha düşük olduğunu gösterilmiştir. Brom atomlarının pozisyonlarının dehalojenasyon yollarında kritik bir rol oynadığı belirlenmiştir. İyileştirme senaryoları arasında, biyoogmentasyon genellikle en yüksek bozunma hızlarını sağlarken, bazı durumlarda biyostimulasyon daha yüksek hızlar göstermiştir. Bununla birlikte, belirli reaksiyonlar toksik ürünlerin oluşumunu desteklemiştir, bu da biyostimulasyon uygulamasında dikkatli olunması gerektiğini vurgulamıştır. Model, iyileştirme stratejilerinin optimize edilmesi ve daha az zararlı ürünlerin elde edilmesi için bir analiz çerçevesi sunmaktadır.