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  • Küçük Resim
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    Determination of cobalt in chamomile tea samples at trace levels by flame atomic absorption spectrophotometry after poly(vinyl alcohol)-magnetic hydrogel based dispersive solid phase extraction
    (The Royal Society of Chemistry, 2023) Karlıdağ, Nazime Ebrar; Demirel, Rabia; Serbest, Hakan; Turak, Fatma; Bakırdere, Sezgin
    In this study, an analytical strategy was proposed for the determination of cobalt at trace levels by using a flame atomic absorption spectrophotometry (FAAS) system after magnetic hydrogel based dispersive solid phase extraction (MH-DSPE). Poly(vinyl alcohol) based magnetic hydrogels (PVA-MH) were synthesized easily, quickly, and cost effectively in the laboratory and used as an adsorbent material in the microextraction process. Under the optimum experimental conditions, the limit of detection (LOD) and limit of quantitation (LOQ) values were recorded as 4.2 and 14.1 mg L−1 , respectively. To investigate the matrix effects on the analyte signal, spike experiments were performed using chamomile tea extracts and good recovery results were obtained between 85.7 and 113.8%. A 57.8-fold improvement was achieved in the detection power compared to that of a conventional FAAS system. The results obtained throughout all experimental studies demonstrated the applicability in addition to the accuracy of the method for the quantification of trace levels of cobalt with high accuracy in a chamomile tea matrix.
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    Microwave assisted effective synthesis of CdS nanoparticles to determine the copper ions in artichoke leaves extract samples by flame atomic absorption spectrometry
    (Academic Press Inc., 2023) Şaylan, Meltem; Metin, Berfin; Akbıyık, Hilal; Turak, Fatma; Çetin, Gülten; Bakırdere, Sezgin
    In this study, an accurate and sensitive analytical strategy based on cadmium sulfide nanoparticles assisted dispersive solid phase extraction (CdS-NPs-DSPE) was developed for the preconcentration/separation of copper ions in the extract of artichoke leaves. The CdS-NPs-DSPE method was combined with slotted quartz tube-flame atomic absorption spectrometry (SQT-FAAS) for the first time. The CdS-NPs were synthesized using microwave-assisted reaction as a new and rapid synthesis method for the CdS precursor solution. The morphology and structure of the synthesized sorbent were characterized using SEM, XRD, and FT-IR. The optimum conditions of the method were as follows: 40 mL sample volume, 0.10 mL of pH 4.0 buffer solution, 7.5 mg CdS NPs, 30 s sonication period, and 100 µL of concentrated HNO3. According to the experimental results, the calibration plot was linear in the concentration range of 2.5–30 µg/L, with a detection limit of 0.71 µg/L. The enhancement in detection power was calculated as 162-folds based on LOD comparison. The reliability and applicability of the proposed method were validated by spiking artichoke leave extracts at different concentrations. The percent recoveries calculated for 50 and 150 µg/L piked samples were 87 ± 12.6 % and 116.8 ± 3.2 %, respectively. These findings verify that the proposed method can be used for accurate and precise determination of copper ions in artichoke leaves.
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    Plastic sieve equipped two-syringe assisted magnetic colloidal gel for dispersive solid-phase extraction of manganese in tea samples
    (Elsevier, 2022) Aydın, Efe Sinan; Zaman, ‪Buse Tuğba; Serbest, Hakan; Kapukıran, Fatih; Turak, Fatma; Bakırdere, Sezgin
    In this study, a simple and effective analytical method was described for the determination of manganese in a spectrometric system. For this purpose, a plastic sieve fitted between two syringes was used as a dispersive solid phase extraction tool. The extraction of manganese was performed by using a magnetic colloidal gel (MCG), which was formed by mixing cobalt magnetic nanoparticle (Co-MNP) and deep eutectic solvent. All experimental parameters of the method including Co-MNP amount in MCG, MCG volume, cycle number for pressurized mixing in the two-syringe system and eluent type/volume in the desorption step were carefully evaluated in order to find the best experimental conditions for efficient extraction/preconcentration of manganese. The detection limit was calculated as 4.0 ng/mL for manganese extracted by 150 µL of MCG from 8.0 mL of aqueous solution at pH 10 with 8 cycles of pressurized mixing. In order to validate the applicability and the accuracy of the developed system, the optimum conditions were applied to jasmine tea samples. The tea samples were analyzed using the standard addition method and the manganese the manganese content were found in the range of 133 – 245 ng/mL. The obtained results showed that the developed method is applicable, accurate and feasible for the determination of manganese at trace levels.