Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2007, No.4
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Proc. of the Natl. Academy of Sciences of Belarus, Ser. Chemical Sci., 2007, No.4
| Proceedings of the National Academy of Sciences of Belarus
(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCESPublished by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Number 4, 2007
CONTENTS
INORGANIC CHEMISTRY
Shauchenka S. V., Bashkirau L. A., Petrov G. S., Dorofeychyk S. S., Lubinski N. N., Andrasiuk D. V.
Magnetic susceptibility and spin state of cobalt ions in Nd1-xYxCoO3, Nd1-xLaxCoO3. pp. 5--10
Summary:
Chizhova Ye. A., Klyndyuk A. I.
Effect of ferrocuprate LàÂàÑuFå5+d cationic composition on its properties. pp. 11--15
Summary: The cationic nonstoichiometry influence on the structure, thermo- and electrophysical properties of the layered lanthanum-barium ferrocuprate has been studied. It has been found that unit cell and thermal expansion coefficient of LaBaCuFeO5+d decreased with intersubstitution of iron and copper and increased with intersubstitution of lanthanum and barium. The inter substitution of both A- and B-cations in the LaBaCuFeO5+d structure decreases the sample conductivity due to charge transport energy increase in -(Cu, Fe))O2-- layers of the lanthanum-barium ferrocuprate.
COLLOIDAL CHEMISTRY
Vorobiov P. D., Krut'ko N. P., Vorobiova E. V., Basalyga I. I.
The effect of low-molecular weight electrolytes on rheological behaviour of clay- saline dispersions treated by polyañrylamide flocculants. pp. 16--20
Summary: Rheological behaviour of clay-saline suspension treated by various acrylamide polymers has been studied. It has been shown that the suspension rheology substantially depends on the conformation state of polymer macromolecules in saline media as well as on conditions of suspension treatment by polymers. Interactions between cationic acrylamide co-polymer and clay surface have been studied by IR spectroscopy methods. It has been found that adsorption of cationic polyelectroly-te on clay surface in saline medium significantly depends on the intensity of electrostatic interactions among system components.
Komarov V. S., Leonenko L. I., Rat'ko A. I.
On sorption properties of carbon, carbon-mineral, clay-hydroxide and clay-oxide adsorbents. pp. 21--24
Summary: Sorption of iodine, methylene blue, benzoic acid and Pb2+ by carbon, carbon-mineral, clay-hydroxide adsorbents has been studied. It has been shown that sorption capacity of carbon adsorbents prepared by template synthesis, is considerably less than of BAC carbon. Clay-hydroxide adsorbents have sorption capasity by Pb2+ similar to many synthetic and natural inorganic adsorbents. It has been found that adsorbents obtained can be used successfully in many sorption processes for purifying materials from inorganic and organic impurities.
Cherednichenko D. V., Vorobiova E. V., Krutko N. P.
Complex binding agent for regulation of potassium chloride structurization process. pp. 25--29
Summary: The effect of complex binding additives' chemical properties and their stability in saline media on efficiency of structurization process in salt disperse systems based on potassium chloride, has been investigated. It has been shown that using complexes based on film-forming polymers, oligomers and surfactants, with certain proportion of components, increases sample strength by 40--50%, as compared with the most effective applications of initial components. The reason of this sinergy is stabilization of the complex in the saline medium, reactivity increase and wettability improvement of potassium chloride surface.
ANALYTICAL CHEMISTRY
Braikova A. M., Matveiko N. P.
Riboflavin determination by stripping voltammetry. pp. 30--34
Summary: The possibility of using stripping voltammetry for B2 determination in effervescent water-soluble multivitamin preparations has been studied. Optimum conditions for the analysis have been established: B2 accumulation potential -- -550 -- -650 mV, potential scanning rate -- 100--400 mV/sec, accumulation time -- 60--120 sec. As practical approbation of the technique developed, riboflavin determination in effervescent vitamin preparations has been done.
PHYSICAL CHEMISTRY
Volkova E. S., Emelyanenko V. N., Pisarev P. N., Roganov G. N.
Thermodynamic properties of unsaturated ethers in ideal gas state. pp. 35--41
Summary: Thermodynamic functions of vinylmethyl, cis-methylpropenyl, isopropenylmethyl, allenylmethyl, acetylenylmethyl and ethylvinyl ethers in ideal gas state at the temperatures 298.15--1000 K have been determined from known and ab initio calculated geometric and spectral characteristics, as well as on the basis of their conformational states.
Znosak D. V., Vecher A. A., Gusakov A. G, Poluyan A. E, Pankov V. V.
Solid oxide galvanic cell with dissociated oxygen. pp. 42--46
Summary: EMF temperature dependence has been investigated for galvanic element with separated gas space where one electrode was opened to air and the other electrode was exposed to atomic or molecular oxygen beam. Abnormal EMF values below 700 K in case of platinum electrode were probably caused by platinum oxide formation under atomic oxygen impact. The procedure for calculation of atomic oxygen recombination coefficient on different conducting surfaces has been proposed.
Vodopyanova L. A., Yakimovich M. N., Kuvaeva Z. I.
Ion-exchange extraction of L-isoleucine by dinonyl-naphtalenesulfonic acid. pp. 47--50
Summary: It has been established that branching of the side chain of L-isoleucine does not affect L-isoleucine cation interaction with sulphonic acid group of the extractant, as demonstrated by virtually identical values of equilibrium coefficient (Ile+ --H+), and affects water sorption by inversely micellar HD solutions, resulting in water content increase in HD solutions with isoleucine.
Velikanova I. A., Ivanova N. P., Zharsky I. M.
Preparation of oxide iridium-titan electrodes. pp. 51--55
Summary: Influence of temperature, time of heating and iridium content in the active layer on electrocatalytic activity of oxide iridium-titanic electrodes during oxygen evolution in 0.5 M sulfuric acid has been studied. It has been found that the greatest activity of oxide iridium-titanic electrodes is achieved with the following parameters: temperature of final heat treatment 450 °C, time of heat treatment -- 25 minutes. Under these conditions, high electrocatalytic activity of coatings and complete decomposition of hexachloroiridium acid (confirmed by the absence of chlorine peaks in X-ray photoelectronic spectrum) are provided. It has been determined by X-ray photoelectronic spectroscopy, that iridium in the active coating is in oxidized, mainly tetravalent, state.
ORGANIC CHEMISTRY
Dikusar E. A., Kozlov N. G., Potkin V. I., Malama A. A.
Aromatic azomethines, containing ether and ester groups. pp. 56--61
Summary: A method for synthesis of aromatic azomethines containing ether and ester groups, based on vanillin, vanillal avd their esters, has been described.
BIOORGANIC CHEMISTRY
Budnikova L. P., Rubinov D. B., Eryomin A. N.
Tralkoxydime influence on the activity of soluble and immobilized enzyme couple "glucose oxidase -- horseradish peroxidase)) in water-organic medium. pp. 62--69
Summary: The tralkoxydime effect on the activity of soluble and zinc hydroxide-adsorbed enzyme couple of glucose oxidase Aspergillus niger and horseradish peroxidase (HRP) has been studied. Tralkoxydime and organic solvents together increased free and immobilized enzyme couple activity in the oxidation of b-D-glucose and tetramethylbenzidine (TMB). Activating effect of the tralkoxydime on the enzyme couple is determined by the pesticide action on soluble and immobilized HRP activity. Efficiency of enzyme couple activation depends on the organic solvent/pesticide ratio. It has been shown that minimum concentration of tralkoxydime to have some activating effect for the glucose oxidase -- HRP couple in solution, containing 10% of 1,4-dioxan, is 0.05 mM.
Grigorenko Yu. A., Karasyova E. I, Metelitza D. I., Povalishev V. N., Polozov G. I., Shadyro O. I.
Antioxidant activity of cycloderivatives of methylsubstituted phenols -- analogs of a-tocopherol. pp. 70--77
Summary: The comparative study of the inhibited oxidation of o-phenylenediamine (PDA) and 3,3',5,5'-tetramethylbenzidine has been carried out at 20 °C in "pseudoperoxidase" (PPS) and peroxidase (HRP) - systems in the presence of five cycloderiva-tives of methyl-substituted phenols (CDMP I--V) and a known analog of a-tocopherol -- 2,2,5,7,8-pentamethylchroman-6-ol (PMC). The inhibition constants Ki, M or the inhibition degree in percents at maximum concentration of an antioxidant were used for the quantitative characterization of antioxidant activity for all inhibitors. In the PDA inhibited oxidation in PPS, the PMC was most active (Ki 0.88 • 10-4 M and 0.42 • 10-4 M in HRP-system). The antioxidant activity of CDMP I--III on the PDA oxidation in PPS was comparable with the PMC efficiency and characterized by Ki values (1.31--1.44) • 10-4 M. The methyla tion of the HO-groups in CDMP IV and V decreased strongly the antioxidant activity of these compounds.
Dubovskaya L. V., Sleptsova N. M., Epshtein T. V., Vashkevich I. I., Sviridov O. V.
A comparison of different monoclonal antibody immobilization methods for the solid phase competitive immunoassay. pp. 78--82
Summary: A comparative efficiency study for passive adsorption method and two methods for biospecific immobilization of monoclonal antibodies (mAb) onto the wells of polystyrene plates in the solid phase competitive immunoassay, using a test system for human serum total thyroxine (T4) enzyme immunoassay as a model, have been carried out. It has been found that the biospecific method including sequential steps of coating by biotin conjugate with an inert protein, streptavidin and biotinylated mAb to T4, produces the active solid phase with the greatest antigen-binding capacity and provides the best immunoassay performance and economical mAb expenditure.
GEOCHEMISTRY
Gipchik V. I.
Petrochemical characteristic of acid magmatic rocks from the north-eastern part of Bobruisk ring structure. pp. 83--85
Summary: The studied rocks by their mineralogical composition and average content of the major rock-forming oxides (SiO2 --75.58%, K2O+Na2O -- 7.55%, Al2O313.38%, Fe2O3(tot) -- 2.24%, MgO -- 0.63%, CaO -- 0.89%) have been classified as volcanic and hypoabyssal rhyolites (quartz porphyries) of potassium-sodium series. Petrography and petrochemical particularities of the studied rocks would be required for the further investigation of an origin and ore prospecting of the Bobruisk ring structure.
Kusnetsov V., A., Onoshko M. P., Veremchuk S. N.
Lithology-facieses differentiation of chemical composition alluvial sedimentations of the River Dnieper valley. pp. 86--89
Summary: Specific features of chemical composition space differentiation for alluvial sedimentations of Belarusian part of Dnieper River valley have been revealed. Differences between alluvium and lithologic composition, facieses conditions of sedimentation process were shown. The data obtained are important for interpretation of alluvial thickness formation conditions and for assessment of geo-ecological situations in the river valley.
POLYMER CHEMISTRY
Korovina Yu. V., Ivashkevich O. A., Dolinskaya R. M., Shcherbina E. I.
Peculiarities of hydrogenated acrylo nitrile-butadiene rubber thermal aging. pp. 90--94
Summary: The paper discusses regularities in structure and property change of rubbers based on hydrogenated acrylonitrile-butadiene co-polymer cured by sulfur or peroxides, after heat aging at different temperatures, in limp state and under compression.
TECHNICAL CHEMISTRY AND CHEMICAL TECHNOLOGY
Bambalov N. N., Nikitenko A. D.
Interaction of lithium and sodium humates with Sefadex gel. pp. 95--98
Summary: Interaction of peat humic acids (HA) with Sephadex gel during gel-chromatography by using water solutions of lithium and sodium chlorides and hydroxides, has been studied. It has been found that water solution of 0.01 M LiCl is the best eluant, because it is greatly decreases sorption effects and provides molecular mass fractioning of more than 92% of HA in accordance with the theory.
Levdansky E. I., Grebentchuk P. S., Levdansky A. E.
Improving potassium fertilizer production technology. pp. 99--105
Summary: The brief analysis of main methods for potassium chloride extraction from sylvinite ore, used in modern potassium industry, has been presented. Different mill constructions used for potassium ore preparation for flotation, have been compared, advantages of using throw-type strike grinders for these purposes have been described. The new construction of a strike-centrifugal mill has been described, the influence of its basic construction parameters on the effectiveness of material grinding is analyzed. Results of the comprehensive investigation of sylvinite ore selective grinding in the new construction have been presented. On the basis of these results, the advantages of this mill, compared with currently used tumbling bar mill, have been described.
Shevchuk V. V., Zhdanovich I. B., Rudakovskaya T. G., Mozheiko F. F.
On nature of impregnation of clay-carbonate minerals in potassium ore at the 4th pit of Starobin field. pp. 106--110
Summary: A comparative study for determination of extraction in concentrate and degree of opening of insoluble residue in water with basic rock-forming minerals of sylvinite ores of the Starobin field has been carried out and prospects of flotation method use for dressing of the fourth pit ores has been shown.
Maryganova V. V., Szajdak L.
Content of indol-3-acetic acid in peat. pp. 111--114
Summary: The influence of geobotanical nature, chemical composition, pH and the depth of peat location on the content of plant growth hormone indol-3-acetic acid (IAA) has been studied. It has been shown that the content of IAA in peats of different genesis ranged from 57.9 to 210.2 µg•kg-1 and correlated with the proportion of humic substances. In peats from the depth of 75--100 cm of deposits, the content of IAA was much lower comparing with peats from the upper layers (0--50 cm). No essential correlation between the contents of IAA and pH values of peats has been found.
Kozlov N. G., Karpunin V. I.
On chemical nature of binding in lignocarbohydrate complexes of flax bast. pp. 115--120
Summary: It has been found that ether, ester and carbon-carbon bonds are formed between lignine and hydrocarbons of flax bast.
SCIENTISTS OF BELARUS
Ivan Ivanovich Lishtvan (To the 75th Anniversary). pp. 121--123
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