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    Determination of copper at trace levels in fennel tea samples by flame atomic absorption spectrometry after the implementation of simultaneous complexation and supramolecular solvent based spraying assisted liquid phase microextraction
    (Academic press inc., 2025) Tutar, Bahar Karademir; Tutar, Ömer Faruk; Bodur, Süleyman; Derin, Yavuz; Tutar, Ahmet; Bakırdere, Sezgin
    A simple and efficient preconcentration method named as supramolecular solvent based spraying assisted liquid phase microextraction (SUPRAS-SA-LPME) was combined with a flame atomic absorption spectrometry (FAAS) for the determination of copper in fennel tea samples at trace levels. An alkanol (1-decanol)/THF based SUPRAS (containing complexation agent) was used as extraction solvent instead of traditional organic solvents for the first time in an SA-LPME process. Under the optimum conditions, system analytical performance of the developed method was evaluated, and limit of detection (LOD)/limit of quantitation (LOQ) values were recorded as 1.91/ 6.37 mu g kg-1. After the evaluation of system analytical performances, the enhancement in detection power/ calibration sensitivity was found to be 21.3/21.8 folds when the comparison of LOD values/calibration plot slopes of the FAAS and SUPRAS-SA-LPME-FAAS systems. The method applicability was tested for the fennel tea samples by spiking experiments, and acceptable recovery results (80.2% - 111.8%) were obtained for low, mid and high spiked concentration levels.
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    A simple spray assisted extraction/preconcentration of cadmium from sunflower oil, olive oil and hazelnut oil samples prior to flame atomic absorption spectrometry determination
    (Academic Press Inc., 2023) Erarpat, Sezin; Bakırdere, Sezgin; Bodur, Süleyman; Tutar, Ömer Faruk
    In this study, an efficient and simple analytical approach for the preconcentration and extraction of cadmium from sunflower oil, olive oil and hazelnut oil samples using environmentally friendly, easy and efficient vortex assisted reverse phase spray-based fine droplet formation liquid phase microextraction (VA-RP-SFDF-LPME) prior to flame atomic absorption spectrometry (FAAS) measurement was proposed. Limit of detection (LOD)/limit of quantification (LOQ) values were calculated as 2.89/9.62 µg/kg, 2.00/6.68 µg/kg and 4.77/15.92 µg/kg for sunflower oil, olive oil and hazelnut oil, respectively. Recovery experiments were carried out for the evaluation of applicability and accuracy of the developed method. Satisfactory recovery results for hazelnut oil, olive oil and sunflower oil samples were recorded in the range of 92.8 – 111.9%, 96.6 – 108.2% and 90.0 – 105.7%, respectively. These results verified that the proposed method can be accurately applied to the hazelnut oil, olive oil and sunflower oil samples to qualify/quantify their cadmium content. © 2023 Elsevier Inc.