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Öğe Effect of polyvinylpyrrolidone on the corrosion resistance of steel(ELSEVIER SCI LTD, 2005) Gurten, AA; Erbil, M; Kayakirilmaz, KThe effect of polyvinylpyrrolidone (PVP) on the corrosion resistance of steel reinforced concrete was assessed by measuring the corrosion potential, linear polarization resistance and AC impedance during 60 days immersion in NaCl and NaCl + PVP Solutions, Polarization resistance (R-p) values of PVP added reinforced concrete were much higher than those without PVP. The relationship between corrosion potential and linear polarization resistance was analysed. Results from corrosion potential measurements were well comparable with the linear polarization resistance data, AC impedance spectra revealed that the resistance of PVP mixed electrodes was also quite higher than the other electrodes. The mechanical properties of concrete were measured. It wits observed that the compressive strength of concrete had increased approximately 44% in the specimens containing PVP. (c) 2005 Elsevier Ltd. All rights reserved.Öğe Preparation of a chelating resin by immobilizing 1-(2-pyridylazo) 2-naphtol on amberlite XAD-16 and its application ' of solid phase extraction of Ni(II), Cd(II), Co(II), Cu(II), Pb(II), and Cr(III) in natural water samples(MARCEL DEKKER INC, 2003) Narin, I; Soylak, M; Kayakirilmaz, K; Elci, L; Dogan, MA polystyrene divinylbenzene resin (Amberlite XAD-16) functionalized by 1-(2-pyridylazo) 2-naphtol has been synthesized and its sorption properties have been investigated for preconcentration of Ni(II), Cd(II), Co(II), Cu(II), Pb(II) and Cr(III) in natural water samples. The new resin (XAD-16-PAN) was characterized by thermogravimetric analysis and infrared spectrometry. The analytical parameters including pH, sample volume etc. for the quantitative recoveries of the analyte ions using XAD-16-PAN resin were investigated. The effects of alkaline, earth alkaline ions and some anions on the sorption of analyte ions were also examined. The recovery values were greater than 95% and the preconcentration factor was 200 for all analyte ions. The relative standard deviations of the determinations by flame atomic absorption spectrometry were less than 8%. The detection limits of the analyte ions (k=3, N=21) were varying from 0.056 mug/L for Cd to 0.268 mug/L for Cr.Öğe Speciation of Cr(III) and Cr(VI) in tannery wastewater and sediment samples on Ambersorb 563 resin(MARCEL DEKKER INC, 2002) Narin, I; Soylak, M; Kayakirilmaz, K; Elci, L; Dogan, MA simple method has been established for speciation of chromium(III) and chromium(VI) in natural water samples. The method is based on the solid phase extraction of the Cr(VI)-APDC chelate on the Ambersorb 563 carbonaceous resin filled mini-column. After oxidation of Cr(III) to Cr(VI) by using H2O2, the method was applied to the determination of the total chromium. The level of Cr(III) is calculated by difference of total chromium and Cr(VI) concentrations. The influences of the various analytical parameters including pH, amounts of reagents, sample volume on the quantitative speciation values of chromium were investigated. Recoveries of more than 95% were found. No interferences due to major components of the natural water samples and some metal ions were observed. The detection limit based on the 3sigma criterion was 2.70 mug/L for Cr(VI). The presented method was applied for the speciation of the chromium in the tannery waste-water samples from Bor Organized Industrial Region-Nigde (Turkey) with satisfactory results (recoveries >95%, RSD's < 9%).Öğe The primary study on the effects of primer alcohols on the hydrogen evolution reaction on silver electrode(PERGAMON-ELSEVIER SCIENCE LTD, 2003) Gurten, AA; Kayakirilmaz, K; Yazici, B; Erbil, MThe cathodic behaviour of silver in 0.01 M NaCl and 0.01 M NaCl + 1.0 alcohols which are methyl, ethyl and propyl alcohols is investigated at pH 3 and 5 by means of electrolysis. The experimental (E-exp) and theoretical (E-rev) discharge potential are determined in all solutions between Pt and Ag electrodes. The cathodic and anodic overpotentials on silver cathode were determined using a platinum anode. The hydrogen gas is produced on constant potentials (5.00 or 10.00 V) on silver cathode. It is observed that the presence of alcohols decreases the anodic overpotential and increases the hydrogen yield in NaCl solution. (C) 2003 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.
