JFAS_Vol 03 N 02

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Browsing JFAS_Vol 03 N 02 by Author "Lanez, T."

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    Contribution To The Development Of A Simulation Software Performance And Sharing Ratio In Liquid-liquid Extraction
    (University of Eloued جامعة الوادي, 2011-07-01) Hadj Seyd, A.; Lanez, T.
    The present work is to develop software to predict the value yield and the distribution coefficient in the process of liquid-liquid extraction of components of a mixture, from mathematical models expressing these entities, based on equations equilibrium between liquid-liquid phases, and predict the conditions under which the extraction operation is favorable, unfavorable or impossible to realize, by studying the variation of the entities cited, based on the parameters influencing the extraction, which are: initial concentrations, rate of solvent and pH, in the case of a simple extraction (extraction of neutral products) or when it is reactive (extraction of complex acids or bases) for one or more components. The programming language used is "Delphi" which is a very powerful oriented object programming under Windows.
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    Electrochemical Studies Of N'-ferrocenylmethyl-n'-phenylbenzohydrazide At Glassy Carbon Electrode In Different Medium
    (University of Eloued جامعة الوادي, 2011-07-01) Khelef, A.; Neghmouche, N. S.; Lanez, T.
    The oxidative electrochemistry of N'-Ferrocenylmethyl-N'-Phenylbenzohydrazide FcX was studied in acetonitrile with tetrabutylammonium hexafluorophosphate as the supporting electrolyte and aqueous ethanol using the electrochemical technique. This study using cyclic (CV) and rotating disk electrode (RDE) voltammetry showed that the FcX/FcX+ redox couple is reversible in this electrolytes. The effects of changing the scan rate on the electrochemical behavior of ferrocene have been examined. A comparison of the electrochemical behavior of ferrocene and N'-Ferrocenylmethyl-N'-Phenylbenzohydrazid have been examined.
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    Evaluation Of The Inhibitory Effectiveness Of Three Ferrocene Derivatives For Corrosion Of Steel Xc70 By Spectroscopy Of Electrochemical Impedance
    (University of Eloued جامعة الوادي, 2011-07-01) Rahim, O.; Ben Chenna, A.; Zaiz, T.; Chaouch, K.; Lanez, T.
    In this work, we studied the efficacy of corrosion inhibition of carbon steel X70 in HCl 1M solution using ferrocenyl compounds prepared in VPRS laboratory, these compounds are: N-(férrocenyl méthyl)-2-nitro aniline(Fc12), N-(férrocenyl méthyl)-3-nitro aniline(Fc13) and N-(férrocenyl méthyl)-4-nitro aniline(Fc14). The inhibitory potency of these compounds was determined by the electrochemical impedance spectroscopy (EIS). The overall results show that these compounds have varying percentages of inhibition. The adsorption of these compounds on the surface of the metal is a chemical adsorption. In HCl 1M, the compound Fc12 had the best ability of inhibition at a concentration of 70ppm (R = 91.24%).
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    Prediction Of Octanol/water Partition Coefficient Of Selected Ferrocene Derivatives Using Rekker Method
    (University of Eloued جامعة الوادي, 2011-07-01) Ahmedi, R.; Lanez, T.
    In this work we present a theoretical approach for the determination of octanol/water partition coefficient of selected ferrocenes bearing different substituents, the calculation is based on the adaptation of the Rekker method. Our prediction of obtained theoretical partition coefficients values of logP for all studied substituted ferrocene was confirmed by comparison with known experimental values obtained mainly from literature. The results obtained show that calculated partition coefficients are in good agreement with experimental values. For estimation of the octanol/water partition coefficients of the selected compounds, the average absolute error of log P is 0.13, and The correlation coefficient is R2 = 0.966.
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    Square Wave Voltammetric Determination Of Lead In Commercial Kohl Using A Glassy Carbon Electrode
    (University of Eloued جامعة الوادي, 2011-07-01) Saha, M. A.; Alia, M.; Rebiai, A.; Lanez, T.
    A simple sensitive square wave voltammetric method for the determination of lead contamination of several kohl samples purchased from Algeria retail stores was developed using glassy carbon electrode. The peak current response of 5 standards aqueous solution of lead in NaNO3 as supporting electrolyte was observed showing a linear calibration curve in the concentration range of 4×10-3 – 2.5×10-4 mol/l of lead. Over this concentration range, the equation obtained from the linear calibration graph for lead is Y = 0.00068 + 0.0093x with a correlation coefficient of r2 = 0.987. Following this step, the potential of an aqueous solution of 12 kohl samples containing 2 M nitric acid solution as supporting electrolyte is then swept in the same range of potential (-400 to -700 mV). The amount of lead is then deduced using the linear calibration graph for lead. The results showed up to 52.14% of lead present in kohl, this concentration was over the safe limits of lead set by the world health organization standards. However; only five commercial samples of ko