188 research outputs found
Determination of zirconium in water, dental materials and artificial saliva after surfactant assisted dispersive ionic liquid based microextraction
No full textIn this study, an extractive spectrophotometric method is proposed for the determination of trace amounts of zirconium. The method is based on the complex formation between zirconium and 2-(5-bromo-2-pyridylazo)-5-(diethylamino) phenol. Then, the formed complex is concentrated in an ionic liquid (1-hexyl-3-methylimidazolium hexafluorophosphate) phase. The parameters were optimized and analytical figures of merit were obtained. The tolerance limits for diverse ions were calculated. The enhancement factor (EF) and limit of detection (LOD) were found to be 156 and 0.012 mu g L-1, respectively. The relative standard deviation (RSD) was found to be lower than 6%. The proposed method has been successfully applied to water and environmental materials.Unit of the Scientific Research Project of Cumhuriyet University; Unit of the Scientific Research Project of Gaziosmanpasa University; Turkish Academy of SciencesThe authors are fully grateful for the financial support of the Unit of the Scientific Research Projects of Cumhuriyet University and Gaziosmanpasa University. Dr. Mustafa Tuzen thanks to Turkish Academy of Sciences for financial support. The authors also thank to Assoc. Prof. Dr. Derya Ozdemir Dogan for providing the dental filling materials
Determination of uranium in water samples with chromogenic reagent 4-(2-thiazolylazo) resorcinol after ionic liquid based dispersive liquid liquid microextraction
No full textA simple extraction and spectrophotometric determination of trace amount of uranium was described. The method is based on complex formation between uranium and 4-(2-thiazolylazo)resorcinol (TAR), a well known ligand, C9H7N3O2S, and preconcentration of formed complex into a room temperature ionic liquid (RTIL), 1-methyl-3-octylimidazolium hexafluorophosphate. Under optimum conditions, the method is linear in the range of 7.14-1429 A mu g L-1, and 3S (b)/m value was calculated as 0.26 A mu g L-1. The method was applied to uranium spiked water samples. To the best of knowledge, the use of TAR as chromogenic agent with 1-methyl-3-octylimidazolium hexafluorophosphate as extractive medium is the first for the versatile determination of uranium. The accuracy of the method was confirmed with certified reference material (TM 28.3 fortified water).Unit of the Scientific Research Projects of Cumhuriyet University; Gaziosmanpasa University; Turkish Academy of SciencesThe authors are fully grateful for the financial support of the Unit of the Scientific Research Projects of Cumhuriyet University and Gaziosmanpasa University. Dr. Mustafa Tuzen thanks to Turkish Academy of Sciences for financial support
Effective uranium biosorption by macrofungus (Russula sanguinea) from aqueous solution: equilibrium, thermodynamic and kinetic studies
No full textRussula sanguinea (R. sanguninea) macrofungus was employed as a novel cost-effective biosorbent for efficient removal of U(VI) ions from aqueous solution. FT-IR spectroscopy and SEM/EDS technique were used for morphological and chemical characterizations. The maximum adsorption capacity of the macrofungus was found as 174.3 mg/g at pH 5 and 20 A degrees C. The kinetic data best fit with the pseudo-second-order kinetic model (r (2) > 0.99 for the studied temperatures). The exothermic and spontaneous nature of the biosorption process was confirmed by the thermodynamic findings. The reusability test demonstrated that the macrofungus had a good sorption/desorption performance.Unit of the Scientific Research Projects of Cumhuriyet University; Gaziosmanpasa University; Karadeniz Technical University; King Fahd University of Petroleum and Minerals; Turkish Academy of SciencesThe authors are fully grateful for the financial support of the Unit of the Scientific Research Projects of Cumhuriyet University, Gaziosmanpasa University, Karadeniz Technical University and King Fahd University of Petroleum and Minerals due to their some analysis feasibilities. Dr. Mustafa Tuzen also thanks to Turkish Academy of Sciences for financial support
A newly synthesized graft copolymer for magnetic solid phase microextraction of total selenium and its electrothermal atomic absorption spectrometric determination in food and water samples
No full textWOS: 000458119700001TARAMAPUBMEDTARAMASCOPUSWOS:000458119700001TARAMAWOSA newly synthesized polystyrene-g-polyoleic acid-g-polyethylene glycol graft copolymer (PoleS-PEG) was used as adsorbent in the solid phase microextraction of selenium ions by using electrothermal atomic absorption spectrometry (ETAAS). Neodymium magnet was used for separation of analyte ions. Various analytical parameters such as pH, adsorbent amount, mixing time, eluent solution, sample volume, etc. were optimized. The matrix effects of some cations and anions were also studied. The capacity of the adsorbent was found 11.5 mg g(-1). The preconcentration factor was found to be 50. The detection limit (LOD) and quantification limit (LOQ) were found 6.06 ng L-1 and 20 ng L-1, respectively. The calibration curve was linear in the range of 0.02-4.0 mu g L-1. Relative standard deviation was found 3.2%. The accuracy of the method was provided by using standard reference materials. The optimized method was successfully applied to natural water and food samples.Unit of the Scientific Research Projects of the Gaziosmanpasa UniversityGaziosmanpasa University [2017/58]; Turkish Academy of SciencesTurkish Academy of SciencesThe authors would like to thanks the Unit of the Scientific Research Projects of the Gaziosmanpasa University (Project number: 2017/58) for the financial support. Dr. Mustafa Tuzen thanks to Turkish Academy of Sciences for financial support. The authors thanks to proof reading service of Zonguldak Bulent Ecevit University
Solid phase extraction of uranium on a new brush type graft copolymer and spectrophotometric determination of its in water samples
No full textA new versatile solid phase extraction and spectrophotometric determination of uranium (VI) was proposed with using poly(caprolactone-b-vinyl benzyl chloride-g-dimethyl amino ethyl methacrylate), poly(CL-b-VB-g-DMAEMA), amphiphilic brush type block/graft copolymer. The method is based on the adsorption of uranium(VI)-pyrocatechol violet complex on surface on the adsorbent. The parameters such as pH, amount of ligand and copolymer, sample volume were optimized. Detection limit, preconcentration factor and relative standard deviation were found as 0.45 A mu g L-1, 100 and 3.8 %, respectively. Adsorption capacity of the polymer for uranium(VI) was found 52 mg g(-1). The method was applied to different water samples and standard reference materials.Unit of the Scientific Research Projects of Cumhuriyet University; Gaziosmanpasa University; Bulent Ecevit University; Turkish Academy of SciencesThe authors are fully grateful for the financial support of the Unit of the Scientific Research Projects of Cumhuriyet University, Gaziosmanpasa University and Bulent Ecevit University. Dr. Mustafa Tuzen thanks to Turkish Academy of Sciences for financial support
Equilibrium, thermodynamic and kinetic investigations for biosorption of uranium with green algae ( Cladophora hutchinsiae )
No full textRemoval of toxic chemicals from environmental samples with low-cost methods and materials are very useful approach for especially large-scale applications. Green algae are highly abundant biomaterials which are employed as useful biosorbents in many studies. In the present study, an interesting type of green algae, Cladophora hutchinsiae (C. hutchinsiae) was used for removal of highly toxic chemical such as uranium. The pH, biosorbent concentration, contact time and temperature were optimized as 5.0, 12 g/L, 60 min and 20 degrees C, respectively. For the equilibrium calculations, three well known isotherm models (Langmuir, Freundlich and Dubinin-Radushkevich) were employed. The maximum biosorption capacity of the biosorbent was calculated as about 152 mg/g under the optimum batch conditions. The mean energy of biosorption was calculated as 8.39 kJ/mol from the D-R biosorption isotherm. The thermodynamic and kinetic characteristics of biosorption were also investigated to explain the nature of the process. The kinetic data best fits the pseudo-second-order kinetic model with a regression coefficient of > 0.99 for all studied temperatures. The calculated Delta H degrees and Delta G degrees values showed that the biosorption process is exothermic and spontaneous for temperatures between 293 and 333 K. Furthermore, after seven cycling process, the sorption and desorption efficiencies of the biosorbent were found to be 70, and 58%, respectively meaning that the biosorbent had sufficiently high reusability performance as a cleanup tool. (C) 2017 Elsevier Ltd. All rights reserved.Cumhuriyet University; Gaziosmanpasa University; Karadeniz Technical University; Turkish Academy of SciencesThe authors are fully grateful for the financial support of the Unit of the Scientific Research Projects of Cumhuriyet University, Gaziosmanpasa University and Karadeniz Technical University. Dr. Mustafa Tuzen also thanks to Turkish Academy of Sciences for financial support
Usage of the newly synthesized poly(3-hydroxy butyrate)-b-poly(vinyl benzyl xanthate) block copolymer for vortex-assisted solid-phase microextraction of cobalt (II) and nickel (II) in canned foodstuffs
No full textWOS: 000526394400021PubMed ID: 32244139TARAMASCOPUSTARAMAPUBMEDTARAMAWOSThe current research article was reported the synthesis of a novel poly(3-hydroxy butyrate)-b-poly(vinyl benzyl xanthate) block copolymer (PHB-Xa) for vortex-assisted solid-phase microextraction of cobalt(II) and nickel(II) from canned foodstuffs prior to their determinations by flame atomic absorption spectrometry. The block copolymer was synthesized and characterized by nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy. Experimental variables affecting the extraction efficiency of the copolymer were optimized. Since the PHB-Xa block copolymers have a high Tc conjugate structure and hydrophobicity, the use of this adsorbent yielded quantitative results for the extraction of Ni(II) and Co(II). After optimization, the linearities for Ni(II) and Co(II) were 0.05-80 ng mL(-1) and 0.2-100 ng mL(-1), respectively. The limits of detection and the limits of quantification were in the range of 0.015-0.06 ng mL(-1) and 0.05-0.2 ng mL(-1), respectively. The method was successfully applied to determination of Ni(II) and Co(II) in canned foodstuffs prepared by microwave digestion.Turkish Academy of SciencesTurkish Academy of SciencesI would like to thank Assoc. Prof. Ahmet Demirbas for his contributions to the preparation of vegetable sample using microwave digestion system and for the flame AAS analyses. Dr. Mustafa Tuzen thanks to Turkish Academy of Sciences for financial support
Ultrasound-assisted dispersive micro solid phase extraction of maneb in water and food samples with new hybrid block copolymer material prior to micro-spectrophotometric analysis
No full textA simple and effective ultrasound-assisted dispersive micro solid-phase extraction (UA-d mu SPE) method was developed for the spectrophotometric determination of traces maneb in food and water. In this study, a new hybrid block copolymer poly (vinyl benzyl chloride-b-dimethyl aminoethyl methacrylate) (Pvb-DMA) was synthesized and characterized using techniques such as FTIR, SEM-EDX. The synthesized Pvb-DMA was used as an adsorbent for the extraction of maneb for first time in this study. The effects of different experimental variables such as pH, adsorbent amount, sample volume, eluent type were optimized. The statistical toll factorial design was applied to estimate the individual and combined impact of parameters on the extraction of maneb. The applicability of different solvents such as acetone, methanol, ethanol, tetrahydrofuran, acetonitrile for maneb recovery from adsorbent was tested. The detection and quantification limits were found to be 3.3 ng mL(-1) and 10.0 ng mL(-1), respectively. In addition, the preconcentration factor and linear range was obtained 300 and 10-500 ng mL(-1). The extraction recovery and relative standard deviation were found to be 95 % and 2.8 %, respectively.Kapadokya University [KUN.2023-BAGP-020]; TUBAProfessor Dr. Baki Hazer thanks to Kapadokya University (KUN.2023-BAGP-020) for financial support. Professor Dr. Mustafa Tuzen thanks to TUBA for partial supports
Ultrasonic-assisted dispersive liquid-liquid microextraction based on hydrophilic deep eutectic solvents: Application to lead and cadmium monitoring in water and food samples
No full textA green and innovative ultrasonic-assisted dispersive liquid-liquid microextraction using hydrophilic deep eutectic solvents (UA-HDES-DLLME) was developed for the selective and simultaneous extraction and enrichment of Pb (II) and Cd (II) in water and food samples for flame atomic absorption spectrometry. Several natural deep eutectic solvents (NADES) were used for the preparation of six different HDES and methyl violet was used as chelating reagent. Effective parameters such as pH, sonication time, methyl violet amount, DES type, dispersive solvent types, etc were optimized. Relative standard deviation (RSD) and preconcentration factor (PF) were 4.0% and 80. Low limits of detection (LOD, 1.3 ng mL(-1) for Pb (II) and 0.33 ng mL(-1) for Cd (II)) and quantification (LOQ, 4.0 ng mL(-1) for Pb (II) and 1.0 ng mL(-1) for Cd (II)) were found. The method accuracy was confirmed with analyses of certified reference materials.Turkish Academy of Sciences (TUBA)Dr. Mustafa Tuzen would like to thank the Turkish Academy of Sciences (TUBA) for partial support
Vortex-assisted dispersive solid-phase microextraction of manganese in food samples by using newly synthesized biodegradable poly (3-hydroxy butyrate) diethanol amine
No full textA newly synthesized biodegradable polyhydroxy butyrate diethanol amin (PHB-DEA) was used as adsorbent for vortex assisted dispersive solid phase microextraction (VA-dSP mu E) of manganese in food samples. The different parameters were optimized such as pH, amount of adsorbent, time, desorption solvents and also number of reuses. After the sample preparation step, the determination of manganese from food samples was carried out using flame atomic absorption spectrometry. The present developed method showed good LOD value 0.15 ng mL(-1) and LOQ 0.5 ng mL(-1). The 0.5-300 ng mL(-1) linearity range was found and enhancement factor was 182. The inter-day RSD% was 2.2-4.1 and intra-day RSD% was 2.8-5.2. The recovery of manganese was found in 95-98 % . The factorial design was employed such as response surface plots, pareto chart, residual plots and ANOVA to estimate the significant level of the model using central composite design (CCD). The developed VA-dSP mu E procedure was successfully implemented to determine manganese in food samples.Kapadokya University [KUN.2020-BAGP-345 001]; Turkish Academy of Sciences (TUBA), TurkeyThe Kapadokya University Research Funds (#KUN.2020-BAGP-345 001) provided funding for this project. Dr. Mustafa Tuzen thanks to Turkish Academy of Sciences (TUBA) , Turkey for partial supports
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