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  • Kapalı Erişim
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    Application of liquid-liquid microextraction techniques for trace level determination of organic/inorganic analytes in biological, medical, environmental and forensic samples
    (Elsevier, 2025) Chormey, Dotse Selali; Bodur, Sezin Erarpat; Öztürk Er, Elif; Zaman, Buse Tuğba; Bodur, Süleyman; Şaylan, Meltem; Dalgıç Bozyiğit, Gamze; Serbest, Hakan; Bakırdere, Sezgin
    The drawbacks of the conventional liquid-liquid extraction method have been greatly alleviated with the advent of liquid-liquid microextraction methods, which are being actively utilized as effective sample preparation tools for biological, medical, environmental and forensic samples. The complex nature of these sample matrices tend to hinder the accuracy and precision of analytical measurements, and have the potential to cause false positive and false negative results. With sample preparation remaining an integral part of accurate determination of organic and inorganic analytes in complex samples, liquid-liquid microextraction as an efficient sample preparation approach facilitates the acquisition of analytes in final forms that are suitable for modern and classical analytical instruments. The use of very low solvent volumes in liquid-liquid microextraction methods leads to very high enrichment factors, and the availability of different extractants paves way for selective analyte extractions. Recent calls for greener approaches of analysis have been met with the introduction of several green solvents that boost the greenness of liquid-liquid microextraction methods and equally maintain the superiority of the methods. © 2024 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
  • Küçük Resim
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    A simple microwave-assisted synthesis of cobalt ferrite nanoparticles and its application for the determination of lead ions in rooibos (Aspalathus linearis) tea
    (Elsevier, 2023) Fırat Ayyıldız, Merve; Karaman, Devrim Nur; Kartoğlu, Bedrihan; Şaylan, Meltem; Chormey, Dotse Selali; Bakırdere, Sezgin
    In this study, a magnetic sorbent assisted dispersive solid phase extraction (DSPE) method was used to preconcentrate lead ions from rooibos tea samples for determination by slotted quartz tube-flame atomic absorption spectrometry (SQT-FAAS). Cobalt ferrite magnetic nanoparticles (CoFe2O4 MNPs) were synthesized by microwave assisted digestion. Limits of detection and quantification were calculated as 5.3 and 17.6 µg/L, respectively, in a linear dynamic range of 20–800 µg/L. The enhancement factor of the developed method was found to be 80- folds when compared to the detection limit of the regular FAAS system. The percent recoveries obtained for rooibos tea samples spiked at different concentrations were in the range of 77 – 125%, with high repeatability as indicated by low standard deviations. The findings of the study demonstrated that the CoFe2O4 MNPs-based extraction method is a straightforward, fast, affordable, safe, and eco-friendly approach to qualifying/quantifying lead with high precision in the selected beverage sample.