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    A Binary Solvent Dispersive Liquid-Liquid Microextraction Method for the Determination of Four Endocrine Disruptor Compounds by Gas Chromatography with Flame Ionization Detector
    (Springer Int Publ Ag, 2022) Yaman, Burcu; Zaman, Buse Tugba; Chormey, Dotse Selali; Bakirdere, Sezgin; Dilgin, Yusuf
    The present study reports a precise and accurate binary dispersive liquid-liquid microextraction method for the enrichment of selected endocrine disruptor compounds for determination by gas chromatography flame ionization detector. Optimal variables of influential extraction parameters (binary solvent volume, disperser solvent volume, and vortex period) were determined with a design experiment. The main effects of these parameters were examined using analysis of variance (ANOVA), and the optimum parameters of the model were obtained from the model predictor. The analytes recorded detection limits varying between 0.43 and 2.7 ng/mL under the optimum experimental conditions. All the analytes exhibited good linearity and high precision (%RSD<10%) for six replicate measurements of the lowest calibration concentrations. The enhancement in calibration sensitivity for the analytes in GC-FID was found in the range of 41.9-64.5 times for each analyte by applying the developed method. The accuracy and feasibility of the method was assessed using water samples from a well and a hospital sewer, and the percent recovery results calculated using matrix matching calibration were in the range of 90-113%. These results demonstrated that the analytes can be accurately quantified in real aqueous matrices using the developed method.
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    Öğe
    Conductive poly(bromophenol red) film coated graphene oxide-ZnO nanocomposite modified electrode for enzymeless voltammetric determination of ethyl-paraoxon
    (Academic Press Inc Elsevier Science, 2025) Karakaya, Serkan; Demir, Cansu; Zaman, Buse Tuğba; Bakirdere, Sezgin; Dilgin, Yusuf
    This work proposes a sensitive and nonenzymatic electrochemical platform for the cyclic voltammetric determination of ethyl-paraoxon (E-POX) at a poly-bromophenol red (poly(BPR) film coated graphene oxide (GO) and ZnO nanocomposite modified glassy carbon electrode (poly(BPR)@GO-ZnO/GCE). The incorporation of poly (BPR) matrix with GO-ZnO nanocomposite provides a considerable synergistic effect for the voltammetric determination of E-POX by providing a large surface area, more active sites, and high conductivity. The results showed that the poly(BPR)@GO-ZnO/GCE exhibits two linear response ranges from 0.10-3.0 mu M and 5.0-200 mu M with a limit of detection (LOD) of 31 nM and a high sensitivity of 5259 mu A mM-1 cm- 2. Real-world applicability of designed platform was successfully tested in agricultural (tomato and cucumber) and tap water samples, and acceptable recovery values (98.1-114.2 %) were obtained. It is concluded that the proposed platform (poly(BPR), GO, and ZnO) may bring remarkable approaches to the future fabrication of electrochemical sensors.