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RISS 인기검색어
- 검색키워드
- 저자 : Gehad G. Mohamed (검색결과 4 건)
- 무료
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Refat, Moamen S.,Mohamed, Gehad G.,Fathi, Ahmed Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.6
Spectrophotometric micro determination of allopurinol (ALP) via charge-transfer formation is described. This includes the utility of some $\pi$-acceptors such as 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) and 3,6-dichloro-2,5-dihydroxy-p-benzoquinone (p-CLA) for estimation of ALP drug (act as $\grave{e}$-donor). These reactions are applied for determination of ALP in its pharmaceutical preparations coming from different companies. Elucidation of the chemical structure of the solid CT complexes formed via reaction between drugs under study and $\pi$-acceptors, using elemental analyses (C, H, N), I. R., $^1H$ NMR and mass spectrometry.
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Moamen S. Refat,Gehad G. Mohamed,Ahmed Fathi 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.6
Spectrophotometric micro determination of allopurinol (ALP) via charge-transfer formation is described. This includes the utility of some π-acceptors such as 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) and 3,6-dichloro-2,5-dihydroxy-p-benzoquinone (p-CLA) for estimation of ALP drug (act as è-donor). These reactions are applied for determination of ALP in its pharmaceutical preparations coming from different companies. Elucidation of the chemical structure of the solid CT complexes formed via reaction between drugs under study and π-acceptors, using elemental analyses (C, H, N), I. R., 1H NMR and mass spectrometry.
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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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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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