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RISS 인기검색어
- 검색키워드
- 저자 : Tamer Awad Ali (검색결과 4 건)
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Tamer Awad Ali,E.M.S. Azzam,M.A. Hegazy,A.F.M. El-Farargy,Ali A. Abd-Elaal 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In the present study newly developed potentiometric sensors for determination of zinc(II) are presented. The proposed potentiometric method was based on the fabrication of modified carbon paste (MCPE; electrode X) and modified gold nanoparticles-carbon paste (GNPs-CPE; electrode IX) sensors. A mercapto compound of 1,4-bis(5-mercaptopentyloxy)-benzene (BMPB) alone or self-assembled on gold nanoparticles was used as modifier to construct electrode (X) and electrode (IX) sensors, respectively. The prepared electrodes exhibit Nernstian slope of 29.93 ± 0.4 and 26.0 ± 1.02 mV decade-1 towards Zn(II) ion over a wide concentration range of 6.8 × 10-10 to 2.9 × 10-2 and 1.0 × 10-7 to 1.0 × 10-2 mol L-1 for electrode (IX) and electrode (X) sensors, respectively. The limit of detection of the electrode (IX) and electrode (X) sensors was found to be 6.8 × 10-10 and 1.0 × 10-7 mol L-1, respectively. The potentiometric response of the electrode (IX) and electrode (X) based on GNPs-BMPB and BMPB are independent of pH of test solution in the pH range of 2.5–8.1 and 3–7 with a response time of 6 and 8 s for electrode (IX) and electrode (X) sensors, respectively. The proposed sensors showed fairly good discriminating ability towards Zn(II) ion in comparison with many hard and soft metal ions. Finally, the proposed electrodes were successfully used as indicator electrodes in potentiometric titration of zinc ion with sodium tetraphenylborate (NaTPB) and in direct determination of Zn(II) ion in some water samples. The results obtained compared well with those obtained using atomic absorption spectrometry.
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Tamer Awad Ali,Ahmed A. Farag,Gehad G. Mohamed 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
This article is focused on the determination of Fe(III) ion as an important factor in water pollution. A potentiometric method based on screen-printed ion-selective electrode was described for the determination of Fe(III) ion in different polluted water samples. It is based on incorporation of the Fe-phosphotungstate ion-associate in a screen-printed electrode (SPE) composition and tricresylpho-sphate (TCP) as plasticizer. The influences of the paste composition, different conditioning parameters and foreign ions on the electrode performance were investigated. The reversibility and also response time of the electrode have been studied. The electrode showed Nernstian response of 19.20 ± 0.73 mV decade-1 in the concentration range of 1 × 10-7–2.5 × 10-2 mol L-1. The electrode was found to be usable within the pH range of 3–7.5 and exhibited a fast response time (about 7 s), low detection limit (1.57 × 10-7 mol L-1), long lifetime (>6 months) and good stability. The isothermal temperature coefficient (dE0/dt) of the electrode was calculated. The electrode was successfully applied for the determination of Fe(III) ion in pure solutions and polluted water samples (formation, tab and sea water samples) using potentiometric determination technique. The results obtained applying this potentiometric electrode is comparable with those obtained using inductive coupled plasma technique.
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Tamer Awad Ali,Gehad G. Mohamed,M.M. Omar,Noha M. Hanafy 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
The construction, performance characteristics and application of Co(II)-chemically modified carbon paste electrodes (CMCPEs) based on bis(salicylaldehyde)-o-phenylenediamine (Schiff base I, SalophH2; ionophore A), N-salicylidene-o-aminophenol (Schiff base II, SaphH2, ionophore B), [Co(Saloph)] complex (ionophore C) and [Co(Saph)OH2] complex (ionophore D) are reported in this paper. The CMCPEs are prepared by incorporating of A–D ionophores into a plasticized carbon paste electrodes to form electrodes I–IV sensors, respectively. The prepared electrodes exhibit Nernstian slope of 29.20 ± 1.13, 28.20 ± 2.07, 29.90 ± 0.26 and 28.80 ± 1.04 mV decade−1 towards Co(II) ion over a wide concentration range of 1.0 × 10−7–1.0 × 10−2, 7.9 × 10−7–1.0 × 10−2, 4.9 × 10−8–1.0 × 10−2 and 5.1 × 10−7–1.0 × 10−2 mol L−1 with a detection limit of 1.0 × 10−7, 7.9 × 10−7, 4.9 × 10−8 and 5.1 × 10−7 mol L−1 at pH range 3.0–8.0, 3.5–7, 2.0–8.0 and 2.5–7.5 for electrodes I–IV, respectively. The electrodes showed good selectivity for Co(II) ion toward a wide variety of metal ions. The proposed electrodes were successfully applied for the determination of Co(II) ion in real spiked water samples and the results obtained compared well with those obtained using inductively coupled plasma atomic emission spectrometry (ICP-AAS).
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Ahmed A. Farag,Tamer Awad Ali 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The inhibition effect of 2-pyrazinecarboxamide (PCA), KI and their synergistic effect on the corrosion ofcarbon steel in 0.5 M H2SO4 solution was studied by electrochemical techniques. Scanning electronmicroscopy (SEM) was used to characterize the steel surface. The inhibition efficiency increases with theconcentration of PCA and KI and increase further in the presence of PCA/KI mixture. The open circuitpotential and polarization measurements suggested that PCA and its mixture with KI act as mixed-typeinhibitor; while, KI only acts as mixed-type inhibitor with a predominant anodic inhibitor. Theadsorption of PCA and KI on the metal surface in 0.5 M H2SO4 solution obeys the Langmuir adsorptionisotherm. The thermodynamic parameters Kads and DG8ads are calculated and discussed. The probableinhibitory mechanism is proposed from the viewpoint of adsorption theory. The synergism parametersuggests that there is a cooperative mechanism between the iodide anion and PCA cations.
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