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    Determination of copper in rose tea samples using flame atomic absorption spectrometry after emulsification liquid-liquid microextraction
    (Elsevier Sci Ltd, 2024) Kartoglu, Bedrihan; Bodur, Suleyman; Zeydanli, Damla; Gover, Tugce; Ozaydin, Ecem; Bakirdere, Emine Gulhan; Bakirdere, Sezgin
    Rose tea infusion has gained popularity worldwide due to its health benefits. However, it is known that tea plants can be contaminated with heavy metals including copper. Hence, an accurate and applicable analytical method namely emulsification liquid-liquid microextraction based deep eutectic solvent - flame atomic absorption spectrometry (ELLME-DES-FAAS) was proposed to determine copper at trace levels in rose tea samples. Under the optimum experimental conditions, analytical figures of merit for the developed method were examined, and dynamic range, limit of detection (LOD) and limit of quantification (LOQ) were found to be 5.07-246.61 mu g/kg (mass-based) with 0.9992 coefficient of determination, 2.50 mu g/kg and 8.32 mu g/kg, respectively. A matrix matching calibration strategy was employed to boost recovery results, and the acceptable recovery results were recorded between 95.9 % and 118.4 %. According to recovery results, the developed analytical method can be safely employed to determine the concentration of copper in rose tea samples accurately.
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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.