Browsing by Author "Saydan Kanberoglu, Gulsah"

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Development of 5,5′-Bi(1,10 Pvc Membrane Potentiometric Sensor for Silver Determination
(Wiley, 2025) Gungordu Solgun, Derya; Kaya, Nurcan; Saydan Kanberoglu, Gulsah; Agirtas, Mehmet Salih
In this study, the selectivity of the 5.5 '-bi(1,10-phenanthroline) Compound (1) against Ag+ ions as a chemical sensor was investigated by both absorption and potentiometric methods. First, a 1 x 10(-5) M solution of Compound (1) in acetonitrile was prepared. For the selectivity test, 1 x 10(-2) M solutions of metal ions in acetonitrile were prepared. UV-visible absorption measurements were performed by adding metal ions to a 5.5 '-bi(1,10-phenanthroline) compound at certain concentrations. Among the studied metal ions, it was found to be selective only against silver ions. In addition, solid-state contact polyvinylchloride (PVC) membrane electrodes prepared using 5.5 '-bi(1,10-phenanthroline) as an ionophore were found to be selective against Ag+ ions among other ions. The optimum membrane composition of the measurement was determined as 3% 5.5 '-bi(1,10-phenanthroline) + 32% PVC + 64% o-nitrophenyl octyl ether (o-NPOE) + 1% potassium tetrakis(4-chlorophenyl) borate (KTpClPB). The potentiometric properties of the silver selective electrode were determined as linear working range 1.0 x 10(-7)-1.0 x 10(-3) M, detection limit 1.0 x 10(-7) M, pH working range 3.23-9.08, and response time 3 s. Absorption and potentiometric methods confirm the selectivity towards silver ions. The IRC analysis of the silver-containing complex, performed using the DFT/B3LYP method with the LanL2DZ basis set, reveals an activation energy of approximately 0.002 Eh, with the transition state energy at -1.433173 Eh.
Fabrication and Characterization of Sio2@fe3o4@nanodiamonds for Vortex-Assisted Magnetic Solid-Phase Extraction of Lead in Cigarette Samples Prior To Faas Detection
(Springer, 2020) Saydan Kanberoglu, Gulsah; Yilmaz, Erkan; Soylak, Mustafa
A novel, speed and accurate vortex-assisted magnetic solid-phase extraction procedure for separation-preconcentration and flame atomic absorption spectrometric determination of lead at trace levels has been proposed. Silica-coated magnetic nanodiamonds (SiO2@MNDs) as magnetic solid-phase extractor were fabricated and characterized by Fourier transform infrared spectroscopy, X-ray diffraction spectrometry and scanning electron microscopy. Pb(II) could be easily separated from the aqueous solution on the SiO2@MNDs by using a neodymium magnet. Analytical factors affecting the recoveries of Pb(II) such as pH, adsorbent amount, type and volume of eluent and sample volume were optimized. The preconcentration factor, the precision (RSD %, n = 5), the limit of detection and the limit of quantification were 5, 5.3%, 40.8 and 135 mu g L-1, respectively. The effects of matrix ions have been investigated. The presented extraction method has been applied for the determination of lead in cigarette samples and Bush Branches and Leaves certified reference material. Quantitative recoveries changing from 94 to 106% were obtained for accuracy studies.