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1.
Kinetic parameters of amino acid cations in an MK-40 ion-exchange membrane are calculated from the conductivity data. A theoretical quantum-chemical analysis of experimental activation energies for conduction suggests a mechanism of elementary act of transport of amino acid cations in the membrane. 相似文献
2.
D. G. Filatova V. V. Es’kina A. S. Chizhov M. N. Rumyantseva P. A. Shaposhnik V. B. Baranovskaya Yu. A. Karpov 《Journal of Analytical Chemistry》2016,71(5):496-499
An approach is proposed to the determination of selenium and cadmium dopants in new nanocomposites based on zinc and indium oxides. The approach is based on a combination of highly efficient high resolution continuous source electrothermal atomic absorption spectrometry (ETAAS) for the analysis of suspensions and inductively coupled plasma mass spectrometry for the analysis of solutions. A procedure is developed for the determination of Se and Cd dopants and matrix components based on Zn and In in nanocomposite solutions by inductively coupled plasma mass spectrometry. Stabilizing agents for the preparation of suspensions are studied for the ETAAS analysis of powders without their decomposition. The results of determination of CdSe dopants by high resolution ETAAS are validated by inductively coupled plasma mass spectrometry. 相似文献
3.
A. A. Zvyagin D. V. Nenakhov S. N. Korchagina A. V. Shaposhnik V. V. Kotov V. A. Yukish 《Journal of Analytical Chemistry》2010,65(4):414-417
Natural macromolecular compounds, humic acids (HA), have been used to form gas-sensitive layers of piezoelectric resonance gravimetric sensors. HA have been extracted from
humus using alkaline extraction and purified by electrodialysis through ion-exchange membranes. Species have been deposited
onto the electrode surface of piezoelectric quartz resonators by air-spraying their aqueous solutions, the layer thickness
being 100–200 nm. In determining ammonia with the sensor obtained on the basis of purified HA species, the detection limit
is ∼10 mg/m3. Gas-sensitive layers on the basis of humic acids are more stable as compared to the conventionally used gas-sensitive layers
based on pyridoxine hydrochloride or ascorbic acid. 相似文献
4.
V. A. Shaposhnik Pham Thi Le Na T. V. Eliseeva M. A. Makarova 《Russian Journal of Electrochemistry》2011,47(3):316-320
The electrodialysis of an aqueous solution of an alkaline earth complex with ethylenediaminetetraacetic acid (EDTA) was studied
in a wide range of current densities. The curve of the complexonate flow across an anionite membrane versus current density
has three characteristic sections. The first section corresponds to a linear increase in the flow as a function of current
density, the second to a decrease in the flow and decomposition of the complex (barrier effect), and the third to an increase
in the complexonate flow due to the transport coupled with the flow of hydroxyl ions formed in the dissociation of water molecules
at the interface of the solution and the anionite membrane. Conditions for complete separation of the singly and doubly charged
cations were found. 相似文献
5.
P. V. Yakovlev A. V. Shaposhnik V. S. Voishchev V. V. Kotov S. V. Ryabtsev 《Journal of Analytical Chemistry》2002,57(3):276-279
Comparative characteristics of Pt-doped SnO2 sensors with coatings of different depths were studied. It was found that the application of a thin membrane layer enhanced the selectivity and improved the stability of the sensor, as well as its sensitivity in detecting hydrogen in the air. 相似文献
6.
7.
E. V. Butyrskaya V. A. Shaposhnik A. M. Butyrskii A. G. Rozhkova 《Journal of Structural Chemistry》2006,47(1):S86-S90
Calculations using the GAUSSIAN 03 program package were performed to determine the hydrated structures of lithium, potassium, LiCl, NaCl, and sulfonic cation exchanger in the form of alkali metal ions. For ions with positive hydration, the distance between the radii of the first and second spheres of hydration water is larger than in pure water; for ions with negative hydration, this distance is smaller. Salts with different types of hydration for cation and anion have hydrated structures similar to those of ions with negative hydration. 相似文献
8.
S. I. Lazarev A. S. Gorbachev V. A. Shaposhnik V. M. Stamov 《Russian Journal of Applied Chemistry》2006,79(5):736-740
Kinetics of reverse osmosis desalination of aqueous sodium sulfanilate is studied on a laboratory pressure filter unit, in relation to the solution concentration, temperature, and pressure in the intermembrane channel. 相似文献
9.
Depassivation of Ion-Exchange Membranes in Electrodialysis 总被引:1,自引:0,他引:1
Shaposhnik V. A. Zubets N. N. Strygina I. P. Mill' B. E. 《Russian Journal of Applied Chemistry》2001,74(10):1653-1657
Procedures were developed to prevent precipitation on the ion-exchange membrane surface in demineralization of natural hydrocarbonate water by electrodialysis. 相似文献
10.
V. A. Shaposhnik V. I. Vasil’eva R. B. Ugryumov M. S. Kozhevnikov 《Russian Journal of Electrochemistry》2006,42(5):531-537
A laser interferometry method is proposed for studying the instability of concentration fields during electrodialysis. It is shown that exceeding the limiting diffusion current density first gives rise to alternating oscillations and then to oscillations at the membrane whose ionogenic groups exhibit the lowest catalytic activity towards the water dissociation reaction. Thereafter, the auto-oscillation process extends over the whole solution volume in the compartments, and dissipative chaos is observed with a further increase in the current density. This instability is presumably a consequence of unevenly distributed heat sources, namely, the Joule heat and the heat of dissociation and recombination of water molecules. 相似文献