Sofuoğlu, Aysun
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Sofuoğlu, A.
Sofuoglu, A
Sofuoglu, A.
Sofuoglu,A.
Sofuoğlu, A
Sofuoglu, Aysun
Sofuoglu, A
Sofuoglu, A.
Sofuoglu,A.
Sofuoğlu, A
Sofuoglu, Aysun
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aysunsofuoglu@iyte.edu.tr
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03.02. Department of Chemical Engineering
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Current Staff
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Sustainable Development Goals
1NO POVERTY
0
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2ZERO HUNGER
3
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3GOOD HEALTH AND WELL-BEING
6
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4QUALITY EDUCATION
1
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
21
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7AFFORDABLE AND CLEAN ENERGY
10
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8DECENT WORK AND ECONOMIC GROWTH
7
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
16
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
3
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
20
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13CLIMATE ACTION
22
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14LIFE BELOW WATER
13
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15LIFE ON LAND
3
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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17PARTNERSHIPS FOR THE GOALS
0
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Documents
50
Citations
2396
h-index
25
Documents
35
Citations
1361
Scholarly Output
64
Articles
46
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93487/33589
Supervised MSc Theses
11
Supervised PhD Theses
4
WoS Citation Count
1890
Scopus Citation Count
1946
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0
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12
WoS Citations per Publication
29.53
Scopus Citations per Publication
30.41
Open Access Source
53
Supervised Theses
15
| Journal | Count |
|---|---|
| Atmospheric Environment | 9 |
| Environmental Science and Pollution Research | 4 |
| Chemosphere | 3 |
| Environmental Science and Technology | 3 |
| Science of the Total Environment | 3 |
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64 results
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Doctoral Thesis Estimation of Exposure To Persistent Organic Pollutants and Associated Health Risks(01. Izmir Institute of Technology, 2024) Genişoğlu, Mesut; Genişoğlu, Mesut; Sofuoğlu, Aysun; Sofuoğlu, Sait Cemil; Sofuoğlu, Sait Cemil; Sofuoğlu, AysunKalıcı Organik Kirleticiler (POPs), çevresel bozunmaya karşı dirençli, uzun mesafeler boyunca taşınabilen ve organik maddelere olan yüksek afiniteleri nedeniyle çevresel ortamlarda ve gıda zincirinde biriken, küresel olarak yaygın maddeler oldukları için insan sağlığı açısından önemli riskler oluşturur. Pertikül ve hava, toprak ve hava, sedimen ve su arasında dağıldıkları için tarım ürünlerinde, etlerde ve deniz ve tatlı su ürünlerinde bulunurlar. Bu da yutma, soluma ve deri teması yoluyla maruziyete ve sağlık risklerine yol açar. Sonuç olarak, mümkün olduğunca çok sayıda POP grubunu araştırmak için kapsamlı bir tarama çalışması tasarlanmıştır. İzmir'de rastgele seçilen ev ve okullardan, iç ve dış mekan havasıyla beraber çökelmiş toz ve yemek örnekleri toplanmıştır. Ayrıca, kafe/bar/restoranlardan iç mekan çökelmiş toz örnekleri toplanmıştır. Örnekler hazırlık, ekstraksiyon ve temizleme işleminden geçirildikten sonra, PAH'lar, PCB'ler, PBDE'ler, NBFR'ler ve OPFR'lerin hedef bileşikleri GC/MS cihazıyla analiz edilmiştir. Ölçülen konsantrasyonlar ve toplanan maruziyetle ilgili anket bilgileri, USEPA maruziyet-risk modellerine girdi değişkenleri olarak kullanılarak yutma ve soluma maruziyetlerini (kronik günlük alım) Monte Carlo yöntemi kullanılarak ilgili sağlık riskleri simüle edilmiştir. Örnekleme yerleri, kentleşmenin etkisini araştırmak için kırsal, banliyö, kentsel alanlar ve bir sanayi bölgesinin rüzgaraltı yerleri arasında mekansal olarak dağıtılmıştır. Bu tez çalışması kapsamında, küresel literatüre girmiş çalışmalar arasında çevresel ve gıda örneklerinde analiz edilen bu kadar yüksek sayıda hedef POP bileşiği düzeyleri konusunda bilgi veren en kapsamlı veriseti oluşturulmuştur.Article Citation - WoS: 15Citation - Scopus: 19Immobilization of Esterase From Bacillus Subtilis on Halloysite Nanotubes and Applications on Dibutyl Phthalate Degradation(Elsevier, 2023) Rosales, Emilio; Pazos, Marta; Sanroman, Maria Angeles; Balcı, Esin; Sofuoğlu, AysunDibutyl phthalate (DBP) is one of the listed phthalic acid esters (PAEs) known as the priority toxicants which exhibit carcinogenic and teratogenic properties and is responsible for endocrine disruption. Therefore, its removal has become a matter to tackle with. In this work, the feasibility of DBP degradation by esterase and lipase enzymes obtained from various microorganisms and the immobilization of the most effective in a clayey material were investigated. Esterase from Bacillus subtilis exhibited the highest degradation efficiency reaching a complete degradation. Its immobilization onto halloysite nanotubes (HNTs) by adsorption method was studied by response surface methodology using a central composite design face-centered. The four selected factors that affect the HNT-enzyme composite generation were: pH, adsorption time, enzyme/HNT (E/H) ratio, and adsorption temperature, and the optimal conditions were determined (pH 7, time 360 min, E/H ratio 0.2, temperature 30oC). Consequently, the activity did not significantly decrease by immobilization, and the adsorption efficiency and relative activity were determined to be 73.15% and 82.7%, respectively. Besides, the immobilization enhanced thermal and storage stability. As for enzyme reusability, after 7 continuous cycles, the composite maintained almost 75% of its initial activity. Both the free enzyme (1 mg/mL) and the composite degraded 100 mg/L DBP with 100% efficiency and several byproducts were detected. Moreover, the composite could be reused for 7 cycles keeping a remarkable catalytic activity. Overall, this study indicated that the HNT-enzyme composite may be used as an effective candidate for remediation of the environmental media contaminated with DBP and other PAEs.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Article Citation - WoS: 5Citation - Scopus: 7Bleach-Containing Automatic Toilet-Bowl Cleaners as Sources of Vocs, Associated Indoor Air Concentrations and Carcinogenic Risk(Turkish National Committee for Air Pollution Research (TUNCAP), 2020) Ayrı, İlknur; Genişoğlu, Mesut; Gaygısız, Handan; Sofuoğlu, Aysun; Sofuoğlu, Sait CemilHousehold cleaning products are sources of volatile organic compounds (VOCs). Bleach containing products are a special case because reactions occur between chloride and their organic content such as surfactants, perfumes, etc., generating VOCs. This study aimed to determine concentration of 13 VOCs in bleach-containing automatic toilet cleaners, to estimate their indoor air concentrations and associated exposure and health risk levels. Experiments with products purchased from supermarkets were conducted in 20-mL headspace vials by placing 1 g of sample with and without water. Solid-phase micro extraction with a DVB/CAR/PDMS fiber assembly was used for adsorption of VOCs from the headspace, and analyzed using a GC-MS. The median carbon tetrachloride and chloroform concentrations of the studied products ranged from 5.03 × 10?3 to 2.37 × 10?2 ?g/g and 2.53 × 10?2 to 2.37 ?g/g, respectively. The modeled 95th percentile indoor air concentrations in a 1.6 m3 bathroom with no ventilation were estimated to be 1 and 20 ?g/m3 for carbon tetrachloride and chloroform, respectively. The 95th percentile carcinogenic risk associated even with the use of the highest content product, 3.72 × 10?7 and 8.62 × 10?7 for carbon tetrachloride and chloroform respectively, were below the acceptable risk. In conclusion, automatic toilet-bowl cleaners were found to be sources of VOCs, but their emission potentials are not high to cause considerable indoor air concentrations over their suggested product lifetime. In turn, carcinogenic risks associated with inhalation exposure are below the de Minimis risk level of 10?6. © 2020Master Thesis Air Monitoring of Polychlorinated Bibhenyls in Ambient Air of Suburban Area in Izmir, Turkey(Izmir Institute of Technology, 2004) Bozacıoğlu, Sevde Seza; Sofuoğlu, Aysun; Sofuoğlu, AysunPolychlorinated biphenyls (PCBs) are human made toxic chemicals which were first synthesized in 1920s. Because of their inverse effects on environment and human health the usage and production of PCBs were banned in 1970s in United States and all over the Europe. PCBs are prone to long- range atmospheric transport and this makes them ubiquitous in the environment. Due to the importance of long-range transport of PCBs, their concentrations have been measured in many different countries. In order to determine the atmospheric concentration levels of total (gas+particle) PCBs (.PCB) and 41 PCB congeners in İzmir, two sampling programs were designed. 20 successive day and nighttime (called short-term), and 40 a year around representing particle and gas phase samples (called long-term) were collected from May 2003 to March 2004. Effects of temperature, wind speed and direction, and seasonal change on atmospheric concentrations of PCBs were investigated. In the short-term period, average .PCB(41) concentration was 520 pg m-3, while congener base total (gas+particle) polychlorinated biphenyl concentrations ranged from 0.37 . 0.65 pg m-3 (PCB 158) to 305.07 . 86.01 pg m-3 (PCB 33). Similarly, in the long-term analysis average .PCB(41) concentration was found as 419 pg m-3, while the minimum and maximum concentrations of congener base total (gas+particle) PCB concentrations ranged from 0.11 . 10.58 pg m-3 (PCB 70) to 919.69 . 281.18 pg m-3 (PCB 208). Short-term average total concentration was higher than a year average total concentration. The reason could be the revolatilization of these compounds from the contaminated surfaces due to the increase in temperature in early summer/late spring.Generally, the levels of PCB were within the ranges previously measured at different sites. The temperature dependence of gas-phase atmospheric concentrations of PCBs was investigated by using Clausius-Clapeyron relationship. The results were statistically significant for 12 PCB congeners (PCB 74, 70, 101, 99, 87, 82/151, 153, 138, 158, and 128). In addition to temperature, the effect of wind speed and direction was investigated using multiple linear regression analysis. Results of the multiple regression analysis indicated that wind speed was a statistically significant factor for PCB 18 and PCB 17, which have low molecular weights and tendency to be in gas phase. In the long-term data analysis with respect to Clausius-Clapeyron relationship 13 congeners (PCB 18, 17, 31, 28, 33, 74, 70, 95, 99, 153, 138, 187, and 209) were statistically significant with temperature. Introduction of wind speed and wind direction to the Clausius-Clapeyron equation did not resulted in a better correlation. The statistically significant correlated congeners were attributed as they were originated from short-range transport. The other congeners with lower R2 values and poor correlations exhibited that their sources were originated from long-range transport. The only positive slope was obtained for PCB 209 and this could be attributed to the influence of its ongoing source. Since the usage and production of PCBs were banned, the source may be the exchange processes from buildings, indoor air, soils, etc., to overlying atmosphere.Article Citation - WoS: 15Citation - Scopus: 19Brominated Flame Retardants in a Computer Technical Service: Indoor Air Gas Phase, Submicron (pm1) and Coarse (pm10) Particles, Associated Inhalation Exposure, and Settled Dust(Elsevier Ltd., 2019) Genişoğlu, Mesut; Sofuoğlu, Aysun; Kurt Karakuş, Perihan Binnur; Birgül, Aşkın; Sofuoğlu, Sait CemilBrominated flame retardants (BFRs) are found in multi-media indoors, therefore, may pose serious risks to human health. This study investigated the occurrence of BFRs in particulate matter (PM1 and PM10) and gas phase by active and passive sampling, and settled dust to estimate potential exposure in a computer technical service. Polybrominated diphenyl ethers (PBDEs) and their alternatives (novel BFRs, NBFRs) were studied. PM and gas phase were collected on glass fiber filters and polyurethane foam plugs, respectively, and analyzed with a GC/MS after extraction, clean-up, and concentration. Inhalation exposure of the staff was estimated based on the measured concentrations using Monte Carlo simulation. BDE-209 was the dominating PBDE congener in all media while bis(2-ethylhexyl)-3,4,5,6-tetrabromophthalate and 1,2-bis(2,4,6-tribromophenoxy)ethane were those of NBFRs. Submicron particulate matter (PM1) BFR levels constituted about one half of the PM10-associated concentrations, while average PM10 mass concentration (69.9 μg m−3) was nine times that of PM1 (7.73 μg m−3). Calculated log10 dust-gas and PM-gas partitioning coefficients ranged from −5.03 to −2.10, −2.21 to −0.55, and −2.26 to −1.04 for settled dust, PM10, and PM1, respectively. The indoor/outdoor concentration ratios were >1 for all compounds indicating the strength of indoor sources in the service. The estimated potential inhalation exposures, for future chronic-toxic and carcinogenic risk assessments, indicated that the levels of gas-phase and PM1-associated exposures were similar at approximately one half of PM10-associated levels. Results of this study indicate that the occurrence of BFRs in all studied media should be taken into consideration for occupational health mitigation efforts.Article Determination of Henry's Law Constants of Organochlorine Pesticides in Deionized and Saline Water as a Function of Temperature(Elsevier Ltd., 2006) Çetin, Banu; Özer, Serdar; Sofuoğlu, Aysun; Odabaşı, MustafaThe publisher regrets that the second paragraph on p. 4545 was printed incorrectly. It now appears correctly, below. The presence of salts in aqueous solution affects the solubility of organic molecules, through the salting-out effect (Demou and Donaldson, 2002). The salting-out is defined as the decrease in aqueous solubility and increase in the activity coefficient observed for neutral non-polar compounds by dissolved inorganic salts. Ions in solution tightly bind several water molecules into hydration shells. This process (electrostriction), results in a reduction of the volume of the aqueous solution. A smaller aqueous volume results in less available water for cavity formation, and therefore less organic molecules are accommodated; their solubility decreases as a consequence (Schwarzenbach et al., 2002; Demou and Donaldson, 2002). The empirical relation for the effect of ionic strength on Henry’s law constant is described by Setschenow equation (Demou and Donaldson, 2002):Article Citation - WoS: 163An Assessment of Indoor Air Concentrations and Health Risks of Volatile Organic Compounds in Three Primary Schools(Elsevier Ltd., 2011) Sofuoğlu, Sait Cemil; Aslan, Güler; İnal, Fikret; Sofuoğlu, AysunConcentrations of volatile organic compounds (VOCs), including formaldehyde, in classrooms, kindergartens, and outdoor playgrounds of three primary schools were measured in spring, winter, and fall terms in Izmir, Turkey. A health-risk assessment was conducted for odor detection, sensory irritation, chronic toxic effects, and cancer. Active sampling was applied for VOCs and formaldehyde on Tenax TA and DNPH tubes, respectively. VOCs were analyzed in a thermal desorption-GC-MS system. Formaldehyde analysis was performed using an HPLC instrument. Benzene, toluene, and formaldehyde were the most abundant compounds with 95th percentile indoor air concentrations of 29, 87, and 106μg/m3, respectively. Naphthalene and xylenes followed them with an order of magnitude lower concentrations. Two isomers of dichlorobenzene (1,3 and 1,4) were the other notable compounds. The concentrations were utilized to classify the indoor air pollutants with respect to potential health effects. In addition, carcinogenic and chronic toxic risks were estimated using Monte-Carlo simulation. Formaldehyde appears to be the most concerning pollutant with high chronic toxic and carcinogenic risk levels according to the health assessment followed by naphthalene, benzene, and toluene due to their chronic effects.Master Thesis Inhalation Exposure To Polychlorinated Biphenyls in Izmir(Izmir Institute of Technology, 2022) Edebali, Özge; Sofuoğlu, Sait Cemil; Sofuoğlu, AysunPolychlorinated biphenyls (PCBs) are chemicals that are classified as hazardous air pollutants with carcinogenic and chronic-toxic effects on human health. People may be exposed to these chemicals indoors and outdoors via inhalation of indoor and outdoor air. Their production and use were banned worldwide with the Stockholm Convention. Since the Turkish government became an official signatory to the Stockholm Convention in year of 2010, the determination of persistent organic pollutants (POPs) in environmental compartments in Türkiye has gained importance. PCBs are still present in the environment because they are found in materials such as those used in heat transfer, electrical, and hydraulic systems manufactured before the ban due to their persistence to degradation in environment. Industrial processes have an important effect on their environmental concentrations due to unintentional emissions. Therefore, they are still present in air and investigations show that industrial and urban areas have higher levels. The aim of this study was to measure concentrations of PCB compounds in indoor-outdoor air samples collected at homes and schools, and to estimate exposure and associated carcinogenic health risks. Samples were collected at randomly selected sites in urban, semi-urban, and rural areas with polyurethane foam – passive samplers. Samples were analyzed by using gas chromatography–mass spectrometry after Soxhlet extraction. The estimated carcinogenic risks even at the 95th percentile were calculated below the acceptable risk level (10-6), indicating that the population carcinogenic risk associated with inhalation of gas-phase PCBs is not considerable. However, aggregate risks that could be estimated by addition of other plausible exposure pathways would drive the levels above the acceptable level.Article Citation - WoS: 65Citation - Scopus: 77Air and Seawater Pollution and Air–sea Gas Exchange of Persistent Toxic Substances in the Aegean Sea: Spatial Trends of Pahs, Pcbs, Ocps and Pbdes(Springer Verlag, 2015) Lammel, Gerhard; Audy, Ondrej; Besis, Athanasios; Efstathiou, Christos; Eleftheriadis, Kostas; Kohoutek, Jiri; Kukucka, Petr; Mulder, Marie D.; Pribylova, Petra; Prokes, Roman; Rusina, Tatsiana P.; Samara, Constantini; Sofuoğlu, Aysun; Sofuoğlu, Sait Cemil; Taşdemir, Yücel; Vassilatou, Vassiliki; Voutsa, Dimitra; Vrana, BranislavNear-ground air (26 substances) and surface seawater (55 substances) concentrations of persistent toxic substances (PTS) were determined in July 2012 in a coordinated and coherent way around the Aegean Sea based on passive air (10 sites in 5 areas) and water (4 sites in 2 areas) sampling. The direction of air–sea exchange was determined for 18 PTS. Identical samplers were deployed at all sites and were analysed at one laboratory. hexachlorobenzene (HCB), hexachlorocyclohexanes (HCHs) as well as dichlorodiphenyltrichloroethane (DDT) and its degradation products are evenly distributed in the air of the whole region. Air concentrations of p,p′-dichlorodiphenyldichloroethylene (p,p′-DDE) and o,p′-DDT and seawater concentrations of p,p′-DDE and p,p′-DDD were elevated in Thermaikos Gulf, northwestern Aegean Sea. The polychlorinated biphenyl (PCB) congener pattern in air is identical throughout the region, while polybrominated diphenylether (PBDE)patterns are obviously dissimilar between Greece and Turkey. Various pollutants, polycyclic aromatic hydrocarbons (PAHs), PCBs, DDE, and penta- and hexachlorobenzene are found close to phase equilibrium or net-volatilisational (upward flux), similarly at a remote site (on Crete) and in the more polluted Thermaikos Gulf. The results suggest that effective passive air sampling volumes may not be representative across sites when PAHs significantly partitioning to the particulate phase are included.Article Citation - WoS: 36Citation - Scopus: 42Speciated Arsenic Concentrations, Exposure, and Associated Health Risks for Rice and Bulgur(Elsevier Ltd., 2014) Sofuoğlu, Sait Cemil; Güzelkaya, Hilal; Akgül, Özlem; Kavcar, Pınar; Kurucaovalı, Filiz; Sofuoğlu, AysunArsenic species were determined in rice and bulgur samples that were collected from 50 participants who also supplied exposure related information through a questionnaire survey. Speciation analysis was conducted using an HPLC-ICP-MS system. Ingestion exposure to arsenic and associated health risks were assessed by combining the concentration and questionnaire data both for individual participants and the subject population. Inorganic arsenic dominated both in rice and bulgur but concentrations were about an order of magnitude higher in rice (160. ±. 38. ng/g) than in bulgur. Because participants also consumed more rice than bulgur, exposures were significantly higher for rice resulting in carcinogenic risks above acceptable level for 53% and 93% of the participants when the in-effect and the proposed potencies were used, respectively, compared to 0% and 5% for bulgur. An inorganic arsenic standard for rice would be useful to lower the risks while public awareness about the relation between excessive rice consumption and health risks is built, and bulgur consumption is promoted.