Results 151 to 160 of about 1,133 (187)
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Analytica Chimica Acta, 2013
This study proposes the dual electromembrane extraction followed by high performance liquid chromatography for selective separation-preconcentration of Cr(VI) and Cr(III) in different environmental samples. The method was based on the electrokinetic migration of chromium species toward the electrodes with opposite charge into the two different hollow ...
Meysam Safari +2 more
exaly +3 more sources
This study proposes the dual electromembrane extraction followed by high performance liquid chromatography for selective separation-preconcentration of Cr(VI) and Cr(III) in different environmental samples. The method was based on the electrokinetic migration of chromium species toward the electrodes with opposite charge into the two different hollow ...
Meysam Safari +2 more
exaly +3 more sources
Simulation of the Influence of Organic Surfactants on Limiting Current in Electromembrane System
Colloid Journal, 2003A mathematical model of transport processes in ion-exchange membranes in the presence of ionic and neutral organic surfactants was proposed and the processes were described. Reasons for the variation in a limiting electrodiffusion current under the action of various organic surfactants were examined.
K. A. Lebedev +2 more
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Separation of amino acids mixtures containing tyrosine in electromembrane system
Desalination, 2009Abstract The principal distinction of tyrosine transport in the electromembrane system is revealed. It lies in the absence of electromigration of this amino acid through the cation-exchange membrane MC-40 in a wide range of current density. This is true for any pH value, including the region where tyrosine exists mainly in the form of cations.
A.E. Bukhovets +2 more
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Diffusion Boundary Layers in Transport of Aliphatic Acids in Electromembrane Systems
Russian Journal of Electrochemistry, 2002The regularities of the formation of diffusion boundary layers during the transport of aliphatic acids in electromembrane systems are studied and their characteristics obtained experimentally are analyzed. It is shown that their concentration profiles in solutions of the electrodialyzer sections are asymmetric near membranes of different polarity ...
V. I. Vasil'eva, A. K. Reshetnikova
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Journal of Chromatography A, 2019
In the current study, for the first time, the sugaring-out effect was assessed in a conventional electromembrane extraction (EME) system. Utilizing the sugars in the donor solution as green additives can result in production of a pioneering and influential EME mode.
Parisa Mahdavi +2 more
exaly +3 more sources
In the current study, for the first time, the sugaring-out effect was assessed in a conventional electromembrane extraction (EME) system. Utilizing the sugars in the donor solution as green additives can result in production of a pioneering and influential EME mode.
Parisa Mahdavi +2 more
exaly +3 more sources
Russian Journal of Electrochemistry, 2000
Voltammetric characteristics of electromembrane systems with carboxyl-containing polyamidoimide membranes in 0.01 M solutions of sodium and hydrogen chlorides are studied using a rotating membrane disc. The limiting current density increases with the decrease in the exchange capacity and an increase in the generation temperature and imidization degree ...
O. V. D’yakonova +4 more
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Voltammetric characteristics of electromembrane systems with carboxyl-containing polyamidoimide membranes in 0.01 M solutions of sodium and hydrogen chlorides are studied using a rotating membrane disc. The limiting current density increases with the decrease in the exchange capacity and an increase in the generation temperature and imidization degree ...
O. V. D’yakonova +4 more
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Journal of Engineering Physics and Thermophysics, 1993
An analysis of works dealing with investigations of mass and heat transfer in electromembrane systems (EMS) is presented. Basic approaches to the mathematical description of the phenomena of transfer in the solutions and membranes of EMS and mathematical models of the mass and heat transfer processes are considered.
V. B. Korobov, B. I. Konovalov
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An analysis of works dealing with investigations of mass and heat transfer in electromembrane systems (EMS) is presented. Basic approaches to the mathematical description of the phenomena of transfer in the solutions and membranes of EMS and mathematical models of the mass and heat transfer processes are considered.
V. B. Korobov, B. I. Konovalov
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Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1991
We have studied the electromembrane method for obtaining H3PW12O40. using31P,183W and17O NMR, we have studied the conversions of isopoly-and heteropolytungstates over a broad pH range. Depending on the acidity of the medium and the form of the isopolytungstate, we propose two schemes for reaction of isopolytungstates with phosphate ions during ...
O. M. Kulikova +3 more
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We have studied the electromembrane method for obtaining H3PW12O40. using31P,183W and17O NMR, we have studied the conversions of isopoly-and heteropolytungstates over a broad pH range. Depending on the acidity of the medium and the form of the isopolytungstate, we propose two schemes for reaction of isopolytungstates with phosphate ions during ...
O. M. Kulikova +3 more
openaire +1 more source
Journal of Membrane Science, 1995
Abstract The advantages of the rotating membrane disk (RMD) method, which allows the examination of electromembrane sustem (EMS) polarization under conditions of uniform availability of both surfaces of the membrane, are shown. To obtain accurate information on the values of membrane potential (and thus on the solution concentration near the ...
O.V. Bobreshova +2 more
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Abstract The advantages of the rotating membrane disk (RMD) method, which allows the examination of electromembrane sustem (EMS) polarization under conditions of uniform availability of both surfaces of the membrane, are shown. To obtain accurate information on the values of membrane potential (and thus on the solution concentration near the ...
O.V. Bobreshova +2 more
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Desalination, 2014
Abstract This study examines one of the current issues of membrane electrochemistry: the study of ion transport patterns through membranes under high and ultra-high current densities. It focuses on the new mechanisms for their delivery to membrane/solution interface, the role of concentration polarization coupled phenomena and its impact on ...
Mikhail Sharafan, Viktor Zabolotsky
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Abstract This study examines one of the current issues of membrane electrochemistry: the study of ion transport patterns through membranes under high and ultra-high current densities. It focuses on the new mechanisms for their delivery to membrane/solution interface, the role of concentration polarization coupled phenomena and its impact on ...
Mikhail Sharafan, Viktor Zabolotsky
openaire +1 more source