Yazar "Bayraktar, Ahsen" seçeneğine göre listele

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    T-cut slotted quartz tube-atom trap strategy for the on-line preconcentration of thallium in well water samples
    (Elsevier, 2023) Bombom, Miray; Zaman, Buse Tuğba; Dalgıç Bozyiğit, Gamze; Şaylan, Meltem; Bayraktar, Ahsen; Arvas, Büşra; Yolaçan, Çiğdem; Bakırdere, Sezgin
    In this study, an on-line preconcentration system was developed for the quantitative determination of thallium in well water samples using hydrogen-assisted T-cut slotted quartz tube atom trapping (HA-T-SQT-AT) coupled to flame atomic absorption spectrometry (FAAS). The method is based on trapping the thallium atoms on the inner surface of the T-SQT for a short period using sample aspiration and lean flame conditions. Then, hydrogen gas as a reducing agent was released instantly to free the trapped analyte atoms, resulting in a sharp and narrow signal. The system analytical performance was enhanced by performing comprehensive optimization of several factors. The linear range and LOD/LOQ values of the optimized method were found to be 7.5–––200 ng/mL and 2.6/8.7 ng/mL, respectively. Accuracy/practicability of the presented method were verified using well water samples, and the percent recoveries calculated using the external calibration approach were all above 80%.
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    Waste toner particles based dispersive solid phase extraction for the trace determination of cadmium in cinnamon tea samples by flame atomic absorption spectrometry
    (Elsevier, 2026) Ali, Büşra; Büyük, Muhammed Ali; Bayraktar, Ahsen; Serbest, Hakan; Bakırdere, Sezgin
    This study presents a dispersive solid phase extraction (DSPE) protocol for the sensitive and accurate determi nation of trace levels of cadmium ions (Cd2+) by flame atomic absorption spectrometry (FAAS). Toner particles obtained from used printer cartridges were used as sorbent material for preconcentration of Cd2+ ions. Opti mization studies were performed univariately for the achievement of the highest extraction efficiency and the limit of detection (LOD) was found to be 0.55 µg L-1 under optimal operating conditions. By comparing the slopes of the linear plot equations for FAAS and waste toner-based DSPE-FAAS systems, the increase in sensitivity was calculated to be 40.9 times. The feasibility of the developed method was evaluated by spiking recovery studies on cinnamon tea samples and good recovery results between 90.4 % and 119.0 % determined by the matrix matching calibration strategy showed that the method is applicable to cinnamon tea and similar matrices.