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    Development of a Solidification of Floating Organic Droplet-Based Liquid-Liquid Microextraction Method Utilizing a Schiff Base Ligand for the Determination of Nickel at Trace Levels in Saint John’s Wort Tea Infusions by Matrix Matching Calibration Assisted Slotted Quartz Tube-Flame Atomic Absorption Spectroscopy
    (Taylor and Francis Ltd., 2025) Atakol, Melike; Akbıyık, Hilal; Atakol, Arda; Yıldırım, Vedat; Bakırdere, Sezgin; Atakol, Orhan
    A sensitive and economical analytical method involving the solidification of floating organic drop microextraction technique with a dispersive solvent is utilized for extraction and enrichment of nickel in St. John’s wort tea infusions. Bis-N,N′-(salicylidene)-1,3-propanediamine was used as the complexing agent. The analyses were done with a slotted quartz tube-flame atomic absorption spectrometer (FAAS). The experimental parameters for the preconcentration procedure were optimized. The developed method provided a 26.5-fold enhanced detection power compared to determination by conventional FAAS. The limits of detection and quantification were 24 and 79 µg/kg, respectively, within a linear range of 50–500 µg/kg. The applicability of the method was tested on infusions of two samples of St. John’s wort tea. Matrix matching was adopted to eliminate/minimize the interferences on the signal. Spiked experiments in which high recovery values in the range of 89.3–121.4% were obtained indicate the accuracy and validity of the method. © 2025 Taylor & Francis Group, LLC.
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    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 b.v., 2025) Atakol, Arda; Zeydanli, Damla; Göver, Tuğçe; Atakol, Melike; Serbest, Hakan; Karakebap, Kübra; Büyük, Muhammed Ali; Atakol, Orhan; Bakirdere, 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-hydroxyacetophenylidene)-1,3-propanediamine was utilized to form the complex extracted in chloroform with methanol 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.