Results 161 to 170 of about 1,133 (187)
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Analytica Chimica Acta, 2016
Electromembrane extraction (EME) was carried out using a novel instrumentation capable of impedometric monitoring of the system during the extraction. This instrumentation involves a classical two-electrode assembly fed by two time-resolved potential functions, the first for the extraction of analyte and the second for obtaining the impedance ...
Jamil Mohammadi +2 more
exaly +3 more sources
Electromembrane extraction (EME) was carried out using a novel instrumentation capable of impedometric monitoring of the system during the extraction. This instrumentation involves a classical two-electrode assembly fed by two time-resolved potential functions, the first for the extraction of analyte and the second for obtaining the impedance ...
Jamil Mohammadi +2 more
exaly +3 more sources
Journal of Membrane Science, 2000
Abstract We continue a series of experiments especially designed to demonstrate the action of hydrostatic pressure on the selectivity of the cation-exchange membranes. The experimental results are explained qualitatively by the change of the interfacial transport of the ions owing to local water flows under the hydrostatic pressure action. The values
Olga Bobreshova +3 more
openaire +1 more source
Abstract We continue a series of experiments especially designed to demonstrate the action of hydrostatic pressure on the selectivity of the cation-exchange membranes. The experimental results are explained qualitatively by the change of the interfacial transport of the ions owing to local water flows under the hydrostatic pressure action. The values
Olga Bobreshova +3 more
openaire +1 more source
Journal of Chromatography B, 2017
In this work, a microfluidic device was developed for on-chip electromembrane extraction of trace amounts of ephedrine (EPH) and clonidine (CLO) in human urine and plasma samples followed by HPLC-UV analysis. Two polymethylmethacrylate plates were used as substrates and a microchannel was carved in each plate. The microchannel channel on the underneath
Mahroo, Baharfar +3 more
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In this work, a microfluidic device was developed for on-chip electromembrane extraction of trace amounts of ephedrine (EPH) and clonidine (CLO) in human urine and plasma samples followed by HPLC-UV analysis. Two polymethylmethacrylate plates were used as substrates and a microchannel was carved in each plate. The microchannel channel on the underneath
Mahroo, Baharfar +3 more
openaire +2 more sources
Russian Journal of Electrochemistry, 2007
A method for estimating the interfacial potential difference in electromembrane systems with alkaline solutions of amino acids is developed. Systems with MA-41 anion-exchange membranes and aqueous sodium hydroxide solutions with glycine are investigated.
O. V. Bobreshova +4 more
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A method for estimating the interfacial potential difference in electromembrane systems with alkaline solutions of amino acids is developed. Systems with MA-41 anion-exchange membranes and aqueous sodium hydroxide solutions with glycine are investigated.
O. V. Bobreshova +4 more
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Analytica Chimica Acta, 2015
The distribution of electric field vectors was first calculated for electromembrane extraction (EME) systems in classical and cylindrical electrode geometries. The results showed that supported liquid membrane (SLM) has a general field amplifying effect due to its lower dielectric constant in comparison with aqueous donor/acceptor solutions.
Hamid Reza, Moazami +4 more
openaire +2 more sources
The distribution of electric field vectors was first calculated for electromembrane extraction (EME) systems in classical and cylindrical electrode geometries. The results showed that supported liquid membrane (SLM) has a general field amplifying effect due to its lower dielectric constant in comparison with aqueous donor/acceptor solutions.
Hamid Reza, Moazami +4 more
openaire +2 more sources
Analytica Chimica Acta, 2014
In order to understand the limitations of electromebrane extraction procedure better, a simple equivalent circuit has been proposed for a supported liquid membrane consisting of a resistor and a low leakage capacitor in series. To verify the equivalent circuit, it was subjected to a simulated periodical polarity changing potential and the resulting ...
Hamid Reza Moazami +3 more
openaire +2 more sources
In order to understand the limitations of electromebrane extraction procedure better, a simple equivalent circuit has been proposed for a supported liquid membrane consisting of a resistor and a low leakage capacitor in series. To verify the equivalent circuit, it was subjected to a simulated periodical polarity changing potential and the resulting ...
Hamid Reza Moazami +3 more
openaire +2 more sources
Russian Journal of Electrochemistry, 2002
The effect of water dissociation on the mass transfer of salt ions is studied with allowance for the space charge. The Kharkats problem, which considers exaltation of the limiting diffusion current, and the Rubinstein problem, which accounts for violation of the electroneutrality condition in a membrane system, are generalized.
V. I. Zabolotskii +4 more
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The effect of water dissociation on the mass transfer of salt ions is studied with allowance for the space charge. The Kharkats problem, which considers exaltation of the limiting diffusion current, and the Rubinstein problem, which accounts for violation of the electroneutrality condition in a membrane system, are generalized.
V. I. Zabolotskii +4 more
openaire +1 more source
Journal of Membrane Science, 2017
Abstract In an electrochemical system, ion transport near ion exchange membranes or electrodes induces inevitable concentration polarization ( i.e. , formation of diffusion boundaries), which impedes the mass transport and worsens the energy efficiency.
Bumjoo Kim +4 more
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Abstract In an electrochemical system, ion transport near ion exchange membranes or electrodes induces inevitable concentration polarization ( i.e. , formation of diffusion boundaries), which impedes the mass transport and worsens the energy efficiency.
Bumjoo Kim +4 more
openaire +1 more source
Electromembrane extraction in microfluidic formats
Journal of Separation Science, 2022Frederik André Hansen +2 more
exaly