Yazar "Tuzen, Mustafa" seçeneğine göre listele

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    A newly synthesized graft copolymer for magnetic solid phase microextraction of total selenium and its electrothermal atomic absorption spectrometric determination in food and water samples
    (Elsevier Sci Ltd, 2019) Acikkapi, Ayse Nihan; Tuzen, Mustafa; Hazer, Baki
    A newly synthesized polystyrene-g-polyoleic acid-g-polyethylene glycol graft copolymer (PoleS-PEG) was used as adsorbent in the solid phase microextraction of selenium ions by using electrothermal atomic absorption spectrometry (ETAAS). Neodymium magnet was used for separation of analyte ions. Various analytical parameters such as pH, adsorbent amount, mixing time, eluent solution, sample volume, etc. were optimized. The matrix effects of some cations and anions were also studied. The capacity of the adsorbent was found 11.5 mg g(-1). The preconcentration factor was found to be 50. The detection limit (LOD) and quantification limit (LOQ) were found 6.06 ng L-1 and 20 ng L-1, respectively. The calibration curve was linear in the range of 0.02-4.0 mu g L-1. Relative standard deviation was found 3.2%. The accuracy of the method was provided by using standard reference materials. The optimized method was successfully applied to natural water and food samples.
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    Chromium Speciation in Water Samples by Loading a New Sulfide-Containing Biodegradable Polymer Adsorbent in Tip of the Syringe System
    (Springer International Publishing Ag, 2019) Ali, Jamshed; Tuzen, Mustafa; Kazi, Tasneem G.; Hazer, Baki
    A new adsorbent poly-3-hydroxybutyrate-2-(dodecylthiocarbonothioylthio)-2-methylpropionate triester (PH-DTT-MPT) was first time loaded in a micropipette tip for speciation of chromium in different water samples. Total chromium (Cr), trivalent chromium (Cr-III), and hexavalent chromium (Cr-VI) in different natural water samples were determined by electrothermal atomic absorption spectrometry. Known concentration of Cr-III and Cr-VI was passed through a biodegradable polymer for investigation of the behavior of the newly used adsorbent. The newly used copolymer absorbed the Cr-III on surface of the PH-DTT-MPT at pH7.0, while Cr-VI was not adsorbed in desired pH value. After passing the real and standard solutions through the micropipette, then 2.0molL(-1) HCl was used for elution of Cr-III from the biodegradable polymer. Total Cr was calculated after reducing Cr-VI into Cr-III by specific concentration of hydroxy ammonium chloride (HONH2HCl). The concentration of Cr-VI in different natural water samples was estimated after back calculation of Cr-III from total chromium. Effect of analytical parameters like adsorbent, pH, eluent, sample volume, flow rates, and interfering ions was also studied. The LOD, LOQ, RSD, and EF of the developed method were calculated as 6.1ngL(-1), 20ngL(-1), 1.17%, and 90, respectively. Validation of developed method was checked by certified reference materials and spiking addition method. The developed method was successfully applied for determination of total Cr, Cr-III, and Cr-VI in various natural water ecosystems.
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    Usage of the newly synthesized poly(3-hydroxy butyrate)-b-poly(vinyl benzyl xanthate) block copolymer for vortex-assisted solid-phase microextraction of cobalt (II) and nickel (II) in canned foodstuffs
    (Elsevier Sci Ltd, 2020) Altunay, Nail; Tuzen, Mustafa; Hazer, Baki; Elik, Adil
    The current research article was reported the synthesis of a novel poly(3-hydroxy butyrate)-b-poly(vinyl benzyl xanthate) block copolymer (PHB-Xa) for vortex-assisted solid-phase microextraction of cobalt(II) and nickel(II) from canned foodstuffs prior to their determinations by flame atomic absorption spectrometry. The block copolymer was synthesized and characterized by nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy. Experimental variables affecting the extraction efficiency of the copolymer were optimized. Since the PHB-Xa block copolymers have a high Tc conjugate structure and hydrophobicity, the use of this adsorbent yielded quantitative results for the extraction of Ni(II) and Co(II). After optimization, the linearities for Ni(II) and Co(II) were 0.05-80 ng mL(-1) and 0.2-100 ng mL(-1), respectively. The limits of detection and the limits of quantification were in the range of 0.015-0.06 ng mL(-1) and 0.05-0.2 ng mL(-1), respectively. The method was successfully applied to determination of Ni(II) and Co(II) in canned foodstuffs prepared by microwave digestion.