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    A new analytical approach for preconcentration, separation and determination of Pb(II) and Cd(II) in real samples using a new adsorbent: Synthesis, characterization and application
    (Elseiver, 2021) Altunay, Nail; Hazer, Baki; Tüzen, Mustafa; Elik, Adil
    A green and efficient analytical approach was reported for simultaneous preconcentration, and separation of Pb (II) and Cd(II) in water, vegetables, and barbecue samples by dispersive solid-phase microextraction prior to their determination using flame atomic absorption spectrometry. A new poly-3-hydroxy butyrate-polyvinyl triethyl ammonium chloride comb-type amphiphilic cationic block copolymer (PHBvbNCl) was synthesized and char acterized. Main variables such as pH, sorbent amount, adsorption time, eluent type, desorption time, and sample volume were optimized. Detection limits and working ranges for Pb(II) and Cd(II) were 0.03 ?g L-1, 0.15 ?g L-1, 0.1–250 ?g L-1 and 0.5–375 ?g L-1, respectively. Enhancement factor for Pb (II) and Cd (II) were 114 and 98. The adsorption capacity of PHBvbNCl for Pb(II) and Cd(II) was 175.2 mg g? 1 and 152.9 mg g? 1 . After the accuracy of the method was confirmed by the analysis of certified reference materials, it was successfully applied to real samples. Finally, the analytical performance of the present method was compared with other methods.
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    Development of sensitive and accurate solid-phase microextraction procedure for preconcentration of As(III) ions in real samples
    (2021) Elik, Adil; Tüzen, Mustafa; Hazer, Baki; Kaya, Savaş; Katin, K.P; Altunay, Nail
    We synthesized the poly(methyl methacrylate-co-2-aminoethyl methacrylate (PMaema) amphiphilic copolymer in a form of solid phase adsorbent. Then it was used for separation, preconcentration and determination of trace amount of As(III) ions from foods and waters with hydride generation atomic absorption spectrometry. The PMaema was characterized by fourier transform infrared spectrometer and nuclear magnetic resonance spectrometer. The adsorption of As(III) to the PMaema was also supported using computational chemistry studies. The experimental parameters (pH, PMaema amount, adsorption time and ethanol volume) were optimized using a three-level Box–Behnken design with four experimental factors. We observed linear calibration curve for the PMaema amount in the 10–500 ng L?1 range (R2 = 0.9956). Limit of detection, preconcentration factor and sorbent capacity of PMaema were equal to 3.3 ng L?1, 100 and 75.8 mg ­g?1, respectively. The average recoveries (spiked at 50 ng ­L?1) changes in the range of 91.5–98.6% with acceptable relative standard deviation less than 4.3%. After validation studies, the method was successfully applied for separation, preconcentration and determination of trace amount of As(III) from foods and waters.
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    Poly(styrene)-co-2-vinylpyridine copolymer as a novel solid-phase adsorbent for determination of manganese and zinc in foods and vegetables by FAAS
    (Elseiver, 2020) Tüzen, Mustafa; Elik, Adil; Hazer, Baki; Şimşek, Selçuk; Altunay, Nail
    he aim of this study is to extract zinc and manganese from foods and vegetables using an amphiphilic copo lymer adsorbent, poly(styrene)-co-2-vinylpyridine which was synthesized via reversible addition fragmentation chain transfer (RAFT) polymerization from styrene and 2-vinyl pyridine in the presence of a trithiocarbonate and 2,2?-azo-bis isobutyro nitrile (AIBN) in toluene solution under argon at 80 °C. Fourier Transform Infrared (FTIR) and proton nuclear magnetic resonance (1 H NMR) spectroscopy were used in the characterization of the ob tained copolymer. Under the optimum conditions, several validation variables such as uncertainty measurement, selectivity, robustness, precisions, matrix effects and accuracy were investigated. Taking an adsorption time of 15 min, detection limits of 0.04 ?g L ?1 and 0.2 ?g L ?1 and 7.9 ?g L?1 and enrichment factors of 145 and 110 were obtained for Mn(II) and Zn(II), respectively. The method was successfully applied to the analysis of Mn(II) and Zn(II) in foods and vegetables.
  • Küçük Resim
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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.