Kimya Mühendisliği Bölümü Koleksiyonu

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https://hdl.handle.net/20.500.13055/46

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Preparation and characterization of an acrylated-coumarin-containing photo-crosslinked thiol-ene network: Investigation of the free-volume, thermal, UV, and photoluminescence properties
(Wiley, 2025) Uyumaz, Fatmanur; Artuç, Gamze Özgül; Pehlivan, Gamze; Akdoğan, Ayça; Yahşi, Uğur; Tav, Cumali; Bulut, Mustafa; Kahraman, Memet Vezir
Coumarin, a versatile compound, has attracted great interest in polymer science due to its unique properties and diverse applications. The use of coumarins in polymer research opens avenues for the development of materials with improved functionalities. In this study, an acrylated coumarin (a-coumarin) compound containing polymeric films was obtained via UV curing through a thiol-ene click reaction with a free radical mechanism. The obtained a-coumarin-containing polymeric films were subjected to functional characterization using FTIR and NMR analyses and thermal characterization via DSC and TGA. UV–vis and PL analyses were performed to determine the optical properties. Using positron anni hilation lifetime spectroscopy (PALS), the free volume and proportional free volume fraction of the films were analyzed both below and above the glass transi tion temperature (Tg). The Tg values obtained from PALS were several degrees lower than those obtained via DSC. A-coumarin additives inhibit segmental mobility, hence reducing the proportional free volume fraction and increasing the Tg. This study is the first in the literature to investigate the free volume properties of coumarin-containing polymeric films. The study reveals the impact of a-coumarin on thermal, optical, and free volume properties, paving the way for the design of advanced functional materials.
Photocatalytic performance of ag-humic acid magnetic nanoparticles for degradation of methylene blue in aqueous medium
(Istanbul University Faculty of Aquatic Sciences, 2024) Özdemir Olgun, Fatoş Ayça; Kaba, İbrahim
The discharge of organic dyes from industrial plants processing pharmaceuticals, textile fabrics, leather, and petrochemicals is a great concern in terms of water contamination. Even in small amounts less than 1 mgL-1 , dyes have serious effects on the water quality of the aquatic environment. In this study, methylene blue was chosen as a model to represent the azo-dye class that is non-biodegradable, toxic and mutagenic. Photocatalytic degradation is a sustainable and eco-friendly remediation process to eliminate the undesired effects of dye contamination. The morphology of the catalyst highly influences the properties and the efficiency of the catalytic reaction. A novel composite magnetic nanoparticle was synthesized in core-shell structure and characterized with the aid of Scanning Electron Microscope (SEM) images combined with an elemental distribution image (EDX mapping), Zeta Potential, Dynamic Light Scattering (DLS) analyses and Raman Spectrometer. The electronic properties of the fabricated material were enlightened by Mott Schottky measurements. In optical studies, direct band-gap energies were calculated with the aid of Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-DRS). The effective photocatalytic degradation of methylene blue in aqueous medium was maintained with optimum parameters defined within the study. The results support the applicability of the proposed novel magnetic nanoparticle as a catalyst for the degradation of methylene blue in aquatic environment.
Trace determination of cobalt in heather leaf tea by matrix matching calibration assisted flame atomic absorption spectrometry following a dispersive liquid–liquid microextraction utilizing a Schiff base ligand
(Elsevier, 2025) Atakol, Arda; Zeydanlı, Damla; Göver, Tuğçe; Atakol, Melike; Serbest, Hakan; Karakebap, Kübra; Büyük, Muhammed Ali; Atakol, Orhan; Bakırdere, Sezgin
In this study, an analytical method that involves dispersive liquid–liquid microextraction for extraction and enrichment of Co was developed for its determination in heather leaf tea infusions. N,N’-bis(2-hydrox yacetophenylidene)-1,3-propanediamine was utilized to form the complex extracted in chloroform with meth anol as a dispersive solvent. The experimental parameters were optimized to allow for an enhancement of detection power by 35.6-folds compared to direct FAAS measurements while lowering the limit of detection to 0.0154 mg/L and the limit of quantification to 0.0513 mg/L and providing a linear range of 0.050–0.75 mg/L. Spiked recovery experiments were conducted on two brands of heather leaf tea where a matrix matching strategy was employed for further reduction of interferences. The recovery results obtained in the range of 78.7–128.4 % supported the accuracy of the proposed method that promises an economical and easy-to-apply process for the trace determination of cobalt in herbal tea matrices.
Trace copper determination in mate tea and tap water using FAAS and spray-assisted liquid phase microextraction
(Elsevier, 2025) Karakebap, Kübra; Serbest, Hakan; Turak, Fatma; Bakırdere, Sezgin
In the present study, a rapid, efficient and environmentally friendly analytical approach was proposed for the determination of trace copper by flame atomic absorption spectrometry (FAAS) after spray-assisted fine droplet formation based liquid phase microextraction (SFDF-LPME), which eliminates the use of dispersing solvents. With the help of a simple nozzle apparatus, an efficient distribution of the extraction solvent into the sample was achieved. The developed SFDF-LPME-FAAS method achieved a limit of detection (LOD) of 1.6 µg L− 1 and a limit of quantification (LOQ) of 5.2 µg L− 1 under optimal conditions. A wide linear range was recorded with a regression coefficient (R2 ) of 0.9987 between 5.0 and 100 µg L− 1 . The improvement in sensitivity was found to be 57.4-fold by comparing the slopes of the calibration plot equation of FAAS and SFDF-LPME-FAAS systems. The feasibility of the SFDF-LPME-FAAS method was evaluated by recovery studies using mate tea extracts and tap water samples. The good recovery results obtained for tap water samples and mate tea extracts in the range of 81.1 % - 113.8 % and 85.5 % - 120.8 %, respectively, showed that the method is applicable to similar matrices.
Toward green and sustainable zinc-ion batteries: The potential of natural solvent-based electrolytes
(Wiley, 2025) Yaman Uzunoğlu, Gülşah; Yüksel, Recep
Zinc-ion batteries (ZIBs) are emerged as a promising alternative for sustainable energy storage, offering advantages such as safety, low cost, and environmental friendliness. However, conventional aqueous electrolytes in ZIBs face significant challenges, including hydrogen evolution reaction (HER) and zinc dendrite formation, compromising their cycling stability and safety. These limitations necessitate innovative electrolyte solutions to enhance ZIB performance while maintaining sustainability. This review explores the potential of natural solvent-based electrolytes derived from renewable and biodegradable resources. Natural deep eutectic solvents (DES), bio-ionic liquids, and biomass-derived organic compounds present unique advantages, including a wider electrochemical stability window, reduced HER activity, and controlled zinc deposition. Examples include DESs based on choline chloride (ChCl), glycerol-based systems, and biomass-derived solvents such as γ-valerolactone (GVL) and aloe vera, demonstrating improved cycling stability and dendrite suppression. Despite their promise, challenges such as high viscosity, cost, and scalability remain critical barriers to commercialization. This review underscores the need for further research to optimize natural solvent formulations, enhance Zn anode compatibility, and integrate these systems into practical applications. By addressing these challenges, natural solvent-based electrolytes can pave the way for safer, high-performance, and environmentally sustainable ZIBs, particularly large-scale energy storage systems.
DPPH antioxidant assays, molecular docking studies and ADMET predictions of some 4-chloromethyl substituted coumarin compounds
(Adıyaman Üniversitesi, 2024) Özgül Artuç, Gamze
Coumarins and their derivatives, which are secondary metobalites of many plants, are heterocyclic bioactive compounds with various biological properties. Due to these properties, the synthesis of various derivatives and the investigation of their properties are of great interest. 4- (chloromethyl)-7-hydroxy-5-methyl coumarin (1), 4-(chloromethyl)-7-hydroxy-8-methyl coumarin (2), and 4-(chloromethyl)-7-hydroxy coumarin (3) synthesized by Pechmann condensation reaction and characterized by FT-IR, NMR spectral data and elemental analysis data. The antioxidant capacities of the compounds were investigated by difhenyl-2- picrylhydrazyl (DPPH) radical scavenger assay using the UV-Vis spectrophotometric method. The interactions of the compounds with ROS-producing cytochrome P-450, xanthine oxidase, lipooxygenase, monoamine oxidase, and nicotinamide adenine dinucleotide phosphate oxidase enzymes were investigated by molecular docking. All compounds interacted well in the active binding site of most of the enzymes (about 6-8 kcal/mol). The pharmacokinetic and toxicokinetic properties of the compounds, indicating their potential as drug candidates, were analyzed by ADMET predictions. All the results obtained showed that the compounds have properties that could be drug candidates.
Green synthesis of zinc oxide nanoparticles including Rosehip (Rosa canina L.) seed extract: Evaluation of its characterization and bioactivity properties
(Wiley, 2024) Bozkurt, Rabia Nur; Şahin, Selin
The use of bioactive compounds in plants as reducing, stabilizing, and capping agents in nanoparticle manufacturing is an exceptionally eco-friendly approach. This work used rosehip seed extract, acquired by automatic solvent extraction, in the microwave-assisted green production of zinc oxide nanoparticles (ZnO NPs). The total phenolic content (TPC), total flavonoid content (TFC), and antioxidant activity of the extracted materials and nanoparticles were assessed using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) assays. The ideal synthesis parameters were established as 25 mL of extract, pH 12, 360 W of microwave power, and a metal salt concentration of 0.05 M for a duration of 7 minutes. The characterization of the ZnO NPs synthesized under these conditions was performed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX), dynamic light scattering (DLS), zeta potential measurements, and UV-Vis spectrophotometry. High-purity, nano-sized, antioxidant ZnO NPs were manufactured using an ecologically friendly, sustainable, and ecological technique.
Microwave-assisted synthesis of antimony oxide nanoparticles for the determination of trace cadmium in mulberry leaf tea matrices by flame atomic absorption spectrophotometry
(Springer, 2024) İnce, Merve Nur; Serbest, Hakan; Bakırdere, Sezgin
In this study, a rapid, sensitive and accurate analytical method was optimized for the determination of trace levels of cadmium (Cd) by fame atomic absorption spectrophotometry (FAAS) after antimony oxide nanoparticles (AO NPs)-based dispersive solid-phase extraction (DSPE). The AO-NPs were synthesized with a specifc microwave tem perature program, and they exhibited high purity and good surface morphology, making them appropriate sorbent material for the preconcentration/separation of a heavy metal. All experimental parameters afecting the extraction efciency were optimized univariately. Under the optimum operational conditions (35 mL sample volume, 0.75 mL of pH 8.0 bufer, 15 mg of sorbent, 5 s vortex and 100 µL of 1.0 M of HNO3), the limit of detection (LOD) and the limit of quantitation (LOQ) values were determined as 0.27 and 0.89 µg L−1, respectively. Thanks to the developed method, a 164.8-fold improvement in the sensitivity of the conventional FAAS system was achieved. Reusability tests showed that the AO-NPs can be employed 5 times. The feasibility of the method was confrmed by recovery tests with mul berry leaf tea matrices, and good recovery results between 77.6 and 115.8% were obtained using the matrix matching calibration method.
Evaluation of the extraction methods prior to ICP-MS determination of metal levels in kinetic (magic) sand samples used for children’s play
(Taylor & Francis, 2024) Özdemir Olgun, Fatoş Ayça
Kinetic (magic) sand is widely used in preschool activities in order toimprove the children’s creative abilities. Despite its popularity, thisstudy will be the first in literature to assess the heavy metal contentof kinetic sand samples. Focusing on the determination of metalcontent (Hg, Cd, Sb, Sn, Al, Ni, Co, Cu, Pb) of 10 different brands ofkinetic sand samples sold in Turkish markets, the significance ofsample preparation step was further discussed with the applicationof wet digestion and microwave digestion methods, prior to analy-sis by ICP-MS. Based on the acute toxicity classes defined byEuropean Union (EU) As, Cd, Hg belongs to Class 1; Ni, CrVI, Pbbelongs to Class 2, whereas Zn and Cu belongs to Class 3. Amongthe potential toxic elements studied, the Al content of samplesattracts attention with its high level exceeding the limits ofdirectives.
Development an effective adsorptive treatment strategy for the removal of cadmium from textile wastewater by CuBi2O4@Fe3O4 nanocomposites
(Taylor & Francis, 2025) Büyük, Muhammed Ali; Serbest, Hakan; Dalgıç Bozyiğit, Gamze; Bakırdere, Sezgin
In this study, copper-bismuth oxide/iron oxide (CuBi2O4@Fe3O4) nanocomposites were pre-pared by microwave-assisted synthesis and used as adsorbents for the adsorptive removalof cadmium from textile wastewater. The pH/volume of buffer solution, mixing type/periodand adsorbent dosage were optimized univariately to enhance the removal efficiency of theadsorbent and determined as 1.5 mL of pH 8.0 buffer solution, vortexing for 60s, and 30 mgof CuBi2O4@Fe3O4 nanocomposite material. Following the determination of the optimumparameters, equilibrium adsorption studies were performed at five different initial concentra-tions of cadmium within the range of 0.50 − 10 mg L−1 in textile wastewater. A matrix-matching calibration strategy was utilized for the accurate and precise quantification of cad-mium in the wastewater matrix with a R2 value of 0.9961. The percent removal efficiencieswere calculated within the range of 77.2 − 81.5% for the adsorptive removal of cadmiumions from textile wastewater in the equilibrium adsorption experiments. Furthermore, theLangmuir, Freundlich, and Sips adsorption isotherm models were employed for modelingthe equilibrium data, and the results showed that all the models fitted well with the experi-mental data with R2 values higher than 0.99. The simple and efficient batch adsorption pro-cess developed was successfully utilized to remove cadmium ions from textile wastewater.
Development of analytical strategy for the determination of cadmium by flame atomic absorption spectrometry after dithizone/deep eutectic solvent probe based liquid phase microextraction
(Taylor & Francis, 2024) Akbıyık, Hilal; Serbest, Hakan; Kılınç, Yağmur; Oflu, Sude; Gürsoy, Selim; Özdoğan, Nizamettin; Çetin, Gülten; Bakırdere, Sezgin
Liquid phase microextraction (LPME) with a dithizone/deep eutecticsolvent (DTZ-DES)-based probe was employed for the determinationof trace cadmium by flame atomic absorption spectrometry (FAAS).All extraction parameters were univariately optimized to achieve thehighest efficiency and the limits of detection and quantification were3.5 and 11.8 ng mL−1. Good linearity was obtained from 10 to200 ng mL−1 with a regression coefficient (R2) of 0.9979. The sensitiv-ity of FAAS system was improved 26.9-fold by the microextractionprocedure. The accuracy and applicability of the method were inves-tigated with recovery experiments carried out using corn silk teaextracts. The recovery values with matrix matching calibration werefrom 81.3 to 114.3%, demonstrating that this environmentallyfriendly method is applicable for determination of cadmium in teasamples with good accuracy.
Efficient removal of estrone and 17β‑estradiol from aqueous medium using UV irradiation‑assisted fenton process
(Springer Link, 2024) Dikmen, Yaren; Şaylan, Meltem; Oflu, Sude; Fırat Ayyıldız, Merve; Serbest, Hakan; Dalgıç Bozyiğit, Gamze; Bakırdere, Sezgin
The endocrine-disrupting compounds (EDCs) have high-risk implications for public health and the environment due to their potential to interfere with endocrine system functions. This study is based on an evaluation of the applying the UV-assisted Fenton process for the removal and degradation of 17β-estradiol and estrone in aqueous medium. The simple and affordable UV irradiation system was developed and applied to accelerate the Fenton reaction. High performance liquid chromatography (HPLC) was employed for the quantitative measurements of estrogenic hormones at 230 nm, which is highly sensitive and capable of accurately measuring hormones within 15 min. The LOD/LOQ values of HPLC system were recorded to be 0.03/0.11 mg/kg and 0.05 /0.15 mg/kg for estrone and 17β-estradiol, respectively. Fe3O4 magnetic nanoparticles and iron (II) sulfate solution were evaluated as appropriate iron sources under fixed UV irradiation to assess the Fenton process. The main parameters, namely hydrogen peroxide (H2O2) amount, iron (II) sulfate amount, pH, and UV irradiation period, were optimized univariately for determining the optimum conditions. The optimum conditions were recorded to be: 0.70 mL of pH 3.0 buffer solution, 1.25 mL of H2O2, 0.80 mL of 100 mg/L Fe2+ solution, and an irradiation time of 60 min. The removal experiments were also carried out on domestic wastewater to validate the system’s applicability. The percent removal efficiencies of both estrogenic hormones were calculated at higher than 99%. These results showed that high efficiency was achieved within the detection limits of the HPLC system. This proves the possibility of complete degradation of the analytes and their efficiency and practicality for pollution control and water quality improvement in future studies.
Neopren/kloropren kauçuk formülasyonu, fiziksel, mekanik ve reolojik özelliklerinin incelenmesi
(İstanbul Ticaret Üniversitesi, 2024) Topraksever, Nükte; Mehmet, Osman
Bu çalışmada geliştirilen aleve dayanıklı neopren/kloropren konveyör bant formülasyonunun fiziksel, mekanik ve reolojik özellikleri incelenmiştir. Öncelikle reolojik özelliklerden vulkanizayon eğrisi reometre ile elde edilmiş, vulkanize olan kompozitler fiziksel ve mekanik testler için hazır hale getirilmiştir. Belirlenen standartlara göre alınan konveyör bant numunelerine yoğunluk, sertlik, kopma uzaması ve çekme mukavemeti ve aşındırma testleri yapılmıştır. Test sonuçlarına göre, çekme dayanımı; 219,9 N/mm2, kopma noktasındaki yük; 290,33 N, kopma noktasındaki uzama yüzdesi; %520,37, sertlik; 59,740,90, aşınma; 78,562,49 mm3 ve yoğunluk; 1,1080,051 g/cm3’tür. Yapılan testler Türk Standartları Enstitüsünün yer altı madenlerinde kullanılabilecek tekstil karkaslı kauçuk veya plastik kaplı konveyör bantlar için sunduğu standartlara uyumlu olarak bulunmuştur.
Adsorptive removal of phosphate from aqueous solutions using FeCl3-immobilized melamine-formaldehyde-urea resin
(Wiley Online Library, 2024) Özdemir Olgun, Fatoş Ayça; Çetin, Pınar
he surplus phosphorus in aquatic environments trigger eutrophication, an irre versible pollution stage marked by the rapid growth of algae and water plants, a decline in dissolved oxygen levels, and the emergence of dead zones. To address this critical issue, this study focuses on the removal of phosphorus in form of phosphate from aqueous solutions. The research involves the synthesis and characterization of FeCl3-immobilized melamine-formaldehyde-urea resin, an innovative adsorbent, its characterization through Fourier transform infrared spectroscopy, and the evaluation of its adsorption capacity based on Langmuir and Freundlich equilibrium models. The experimental adsorption data fits well with pseudo-second order kinetic model. Optimal adsorption parameters are carried with batch adsorption technique for 60 min using 0.5 g of adsorbent at pH = 2, achieving 15.55 mg g 1 adsorption capacity, and conducting experiments with tap-water samples to replicate real-world scenarios. The research findings have the potential to advance sustainable wastewater treatment technologies and contribute to the mitigation of nutrient pollution in aquatic ecosystems, addres sing a pressing environmental concern.
Unravelling the potential of magnetic nanoparticles: a comprehensive review of design and applications in analytical chemistry
(Royal Society of Chemistry, 2024) Çiçek Ozkul, Serra Lale; Kaba, Ibrahim; Özdemir Olgun, Fatoş Ayça
The study of nanoparticles has emerged as a prominent research field, offering a wide range of applications across various disciplines. With their unique physical and chemical properties within the size range of 1–100 nm, nanoparticles have garnered significant attention. Among them, magnetic nanoparticles (MNPs) exemplify promising super-magnetic characteristics, especially in the 10–20 nm size range, making them ideal for swift responses to applied magnetic fields. In this comprehensive review, we focus on MNPs suitable for analytical purposes. We investigate and classify them based on their analytical applications, synthesis routes, and overall utility, providing a detailed literature summary. By exploring a diverse range of MNPs, this review offers valuable insights into their potential application in various analytical scenarios.
Accurate and sensitive determination of mefenpyr-diethyl in barley, oat and corn silk matrices by gas chromatography – flame ionization detector (GC–FID)
(Zonguldak Bülent Ecevit University, 2024) Serbest, Hakan
Pesticides are frequently utilized in the cultivation of agricultural products for human consumption to prevent / minimize the detrimental effects caused by pests and to keep the yield at the desired levels at harvest time. Besides the benefits of pesticides, unconscious use of pesticides causes the occurrence of different diseases. Monitoring the levels of pesticide residues is of vital importance for the environment, human, and other living organisms. In the present study, an analytical method was reported for the determination of mefenpyr-diethyl (MFD) as a member of the herbicide group by gas chromatography flame ionization detector (GC-FID) system with high accuracy and sensitivity. An in-column temperature program was established to effectively separate the analyte, and MFD was determined at a retention time of 5.2 min. The limit of detection (LOD), the limit of quantitation (LOQ), and the linear working range were found to be 0.01 mg/L, 0.04 mg/L, and 0.07-29.7 mg/L, respectively. The applicability of the determination method was investigated by recovery studies with barley, oat, and corn silk matrices. No analytical signal was recorded for MFD in blank samples of all three species. Recovery results close to 100% showed that MFD could be determined with high accuracy in barley, oat, and corn silk matrices.
Nanocomposite and nanohybrid gel polymer electrolytes for safe and high performing lithium metal batteries
(İksad Publishing House, 2023) Yaman Uzunoğlu, Gülşah; Gümüş, Ayşegül; Gümüş, Selçuk
Lithium-ion batteries (LIBs) have gained widespread popularity in the fields of portable electronics, electric vehicles, and grid storage due to their remarkable characteristics. These include their exceptional energy density, power density, and extended cycle life. The high energy density of LIBs allows them to store a significant amount of energy in a compact size, making them ideal for portable electronic devices. Additionally, their high power density enables them to deliver a substantial amount of power quickly, which is crucial for applications such as electric vehicles. Moreover, LIBs exhibit a long cycle life, meaning they can undergo numerous charge and discharge cycles without significant degradation in performance. This longevity makes them reliable and cost-effective for grid storage systems. Overall, the exceptional features of LIBs have propelled their extensive use in various industries, revolutionizing the way we power our devices and vehicles. The discovery of intercalation electrodes by Whittingham in the 1970s laid the foundation for LIB development. In the subsequent decades, Goodenough and his colleagues played a pivotal role by developing crucial cathode materials such as layered, spinel, and polyanion. Additionally, Yoshino's pioneering work involved the creation of the first safe LIB prototype, which employed LiCoO2 as the positive electrolde and carbon/graphite as the negative electrode. Since then, remarkable advancements have been achieved in increasing energy density, power density, cycle life, cost-effectiveness, and safety of lithium-ion batteries (Liu, 2021).
Kantitatif tayinde yeşil yöntem: ATR-FTIR; farmasötik preparatta parasetamol tayini
(İstanbul Ticaret Üniversitesi, 2023) Topraksever, Nükte; Özgül Artuç, Gamze
Bu çalışmada azaltılmış toplam yansıma Fourier dönüşümlü kızıl ötesi (ATR-FTIR) spektroskopisi kullanılarak farmasötik preparatta parasetamol tayin edilmiştir. Parasetamol standart konsantrasyonları NaCl ile seyreltilerek % 20 ile % 100 (a/a) arasında hazırlanmıştır. Parasetamol standardının FTIR spektrumu alınarak karakteristik C=O pikinin değişen yüzde geçirgenliği kullanılarak kalibrasyon eğrisi çizilmiştir. Regresyon katsayısı (R2) 0.9993 ile iyi bir doğrusallık göstermiştir. Parasetamol içeren ticari farmasötik preparattaki miktar tayini yapılmıştır. Farmasötik preparattaki parasetamol miktar tayininin geri kazanımı  % 100’dür. Farmasötik preparata uygulanan ATR-FTIR yöntemi parasetamolün rutin tayini için uygundur.
Development of an analytical strategy for the determination of trace lead in hibiscus tea extract by double slotted quartz tube assisted flame atomic absorption spectrometry after manganese ferrite based dispersive solid phase extraction
(Elsevier, 2023) Karaman, Devrim Nur; Serbest, Hakan; Bahçivan, Aleyna; Polat Korkunç, Ümmügülsüm; Bakırdere, Sezgin
In this study, a manganese ferrite (MnFe2O4) based dispersive solid phase extraction method (MF-DSPE) was proposed for the determination of lead (Pb) ions in hibiscus tea by double slotted quartz tube flame atomic absorption spectrometry (SQT-FAAS). The MnFe2O4 nanoparticles used as sorbent were produced in high yields using a green and friendly microwave synthesis procedure. The limit of detection (LOD) was found to be 14.2 µg/L under the optimal conditions. Recovery experiments were performed to assess the applicability of the developed method using hibiscus tea as test sample matrix. High recovery results were obtained by applying the matrix matching calibration method. Thanks to the developed MF-DSPE-SQT-FAAS method, the detection sensitivity for lead was improved by about 108-folds according to the comparison of the slopes of the calibration plots of the FAAS and MF-DSPE-SQT-FAAS systems.
Trace cadmium determination in lake water matrix by flame atomic absorption spectrometry after manganese ferrite magnetic nanoparticles-based dispersive solid phase extraction
(Wiley, 2023) Karaman, Devrim Nur; Serbest, Hakan; Kılınç, Yağmur; Demirel, Rabia; Bakırdere, Sezgin
In this study, manganese ferrite magnetic nanoparticles-based dispersive solid phase extraction (MF-MNP-DSPE) was developed for cadmium determination at trace level by flame atomic absorption spectrometry (FAAS). Manganese ferrite-based magnetic nanoparticles were synthesized to be used as solid phase extraction sorbent. All the analytical conditions were optimized by univariate optimization approach to achieve high enrichment factors. Under the optimum conditions, limit of detection (LOD) and quantification (LOQ) values of the developed method were recorded as 1.3 and 4.3 µg L−1, respectively. Approximately 135-fold improvement in the detection power by the MF-MNP-DSPE-FAAS system was recorded over the traditional FAAS system based on LOD comparison. Recovery experiments were performed to test the applicability/accuracy of the developed method with lake water spiked at different concentrations. Percent recovery values were obtained between 87% and 112% by employing the matrix matching calibration strategy and this showed that the developed method is applicable for the determination of cadmium in lake water samples with high accuracy and precision.

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