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1.
2.
M. Yu. Berezkin E. G. Polyakov V. V. Turygin L. V. Kaabak A. V. Khudenko A. P. Tomilov 《Russian Journal of Applied Chemistry》2008,81(8):1360-1363
Anodic dissolution of ferroniobium in anhydrous methanol in the presence of sodium methylate was studied. The possibility of recovering pure hexamethoxyniobate from the electrolyzate and its conversion into niobium methylate with an iron content not exceeding 0.01% was analyzed. 相似文献
3.
V. G. Berezkin E. Yu. Sorokina A. I. Sokolov B. A. Rudenko 《Journal of Analytical Chemistry》2003,58(1):61-67
The effects of the presence of water vapor in the carrier gas and the temperature on the retention of achiral and chiral compounds, enantioselectivity, and performance of an open-tubular column with a cyclodextrin-containing phase were studied. The use of a carrier gas containing water vapor in the determination of optically active isomers, such as camphor, slightly increases the retention factor. A substantial improvement of performance characteristics of the column was found: for hydroxy compounds, the column performance increased by two to three times and the peak symmetry improved by more than twice. 相似文献
4.
Berezkin Victor G. Mardanov Robert G. Moiseew Aleksey A. Malinowska Irena Różyło Jan K. 《平面色谱法杂志一现代薄层色谱法》2002,15(5):377-379
JPC – Journal of Planar Chromatography – Modern TLC - 相似文献
5.
Summary Flexibility, strength and adsorption inertness of fused-silica capillaries permits their extensive application for the preparation
of micro-packed columns in gas chromatography. Decreasing the column diameter (from 0.5 to 0.15 mm) and the diameter of the
sorbent particles (from 100 to 5 μm) results in a marked reduction of the height equivalent to a theoretical plate (HETP),
as well as in diminishing the dependence of the HETP on the carrier gas flow rate.
The chromatographic characteristics of fused-silica capillary micro-packed columns and open-tubular columns are compared.
The fused-silica capillary micro-packed column can be used to advantage for performing rapid and trace analyses and have been
shown to be adapted for application in gas-solid chromatography. Separation of organic and inorganic compounds on fused-silica
capillary micro-packed columns is illustrated by practical examples.
Presented at the 15th International Symposium on Chromatography, Nürnberg, October 1984 相似文献
6.
V. G. Berezkin V. R. Alishoyev E. N. Victorova V. S. Gavrichev V. M. Fateeva 《Chromatographia》1982,16(1):126-131
Summary The use of crystallohydrates, crystallohydrate solutions and melts as stationary phases in gas chromatography has been proposed. Crystallohydrates have been shown to display high selectivity in the separation of polar organic compounds when use is made of water vapours as the mobile phase. Some aspects of gas-liquid chromatography in water vapours and with the stationary phase comprising crystallohydrates have been studied, and the preliminary results obtained point to the desirability of further progress in this field.Presented at the 14th International Symposium on Chromatography London, September, 1982 相似文献
7.
V. G. Berezkin E. G. Sumina S. N. Shtykov V. Z. Atayan D. A. Zagniboroda G. A. Nekhoroshev 《Chromatographia》2006,64(1-2):105-108
A new variant of thin-layer chromatography (TLC), based on a gradual change of mobile phase acidity during elution, is proposed.
The pH change occurs in the mobile phase moving along the TLC plate as a result of its contact with an acidic or a basic gas
phase that replaces the initial mobile phase vapor in the TLC chamber. The potential of this approach has been demonstrated
by using carbon dioxide and ammonia gases to improve the resolution of benzoic acids and aromatic amines on polyamide TLC
plates. 相似文献
8.
V. G. Berezkin T. P. Popova A. A. Korolev V. E. Shiryaeva L. S. Vasin V. N. Lipavskii 《Journal of separation science》1988,11(1):42-46
The peculiarities of the flow splitting technique for sample injection into a capillary column have been discussed. A comparative investigation of reproducibility of the analytical results obtained for two gas chromatographic systems using flow splitting [1) sample injector-packed predolumn-splitter-open tubular capillary column and (2) sample injector-splitter-open tubular capillary column] has been carried out. It was experimentally shown that the first system ensures considerably better reproducibility for the results concerning the composition of the analyzed mixtures. Other advantages of the first system are also discussed. 相似文献
9.
V. G. Berezkin A. A. Korolev I. V. Malyukova R. G. Mardanov 《Russian Chemical Bulletin》1997,46(12):2064-2073
The effects of the carrier gas nature and pressure on the relative retention values of organic compounds were studied using
a series of capillary columns differing in the film thickness of the polar stationary phase (PEG-20M). Relative retention
depends linearly on the carrier gas pressure. This dependence becomes more pronounced in the following order of carrier gases:
helium < nitrogen < carbon dioxide. The limiting relative retention at a carrier gas pressure approaching zero rather than
relative retention values measured experimentally (relative retention time, Kovats retention index,etc.) is an invariant characteristic of a compound subjected to chromatography. For the carrier gases studied, the limiting retention
values almost does not depend on the nature of the carrier gas used. The limiting indicating the complex absorption-adsorption
nature of these parameters. Dissolution of a carrier gas in the stationary liquid phase has an effect on the relative retention.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2177–2186, December, 1997. 相似文献
10.
V. G. Berezkin G. A. Nekhoroshev 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2006,80(6):955-959
A new variant of thin-layer chromatography (TLC) with a forced flow of the mobile phases produced by an electroosmotic pump on a plate with a closed sorption layer is proposed. The new variant of TLC is tested for separation of dyes with ethanol and acetonitrile as mobile phases. It is established that the new method is 15–33% faster compared to traditional TLC and provides the same or higher efficiency. 相似文献