(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCES
Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus
| Proceedings of the National Academy of Sciences of Belarus (Vestsi Natsiyanalnai Akademii Navuk Belarusi) SERIES OF CHEMICAL SCIENCES Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Summary: Novel ABO3-group materials on a base of a row of doped multilanthanide manganites have been investigated. They are cheaper in comparison with traditional ones. The manganites are promising for use in high temperature electrochemical devices. They were synthesized with using of lanthanide concentrates of industrial waste type as raw materials. Some of physical and chemical characteristics and structure parameters of these multi-oxides materials have been established.
Summary: Alkaline activation of treated zeolite-containing adsorbents and cracking catalysts has been studied. It has been shown that synthesis of new zeolite formations of various compositions takes place at alkaline dissolution of these samples: alumo-silicate adsorbents having quite high sorption capacity and specific surface are formed at dissolution of zeolites in acid and hydroxides precipitation. It has been stated that products of activation of zeolite-containing adsorbents are equal to initial samples and after granulation can be used at direct destination or after acidic treatment they can be used as alumo-silicate adsorbents and so on.
Ratko A. I., Romanenkov V. E., Krupenkina Zh. V.
Macroporous structure and mechanical solidity of composite ceramics on a base of powder components. pp. 15--19
Summary: Structure and mechanical solidity of synthesized material have been studied. It has been shown that graphic dependences obtained permit to forecast creation of block composite high-porous ceramics with high meaning of mechanical solidity.
Summary: Optimal conditions of ion associates extraction of verapamil with azo-reagents have been established. The main chemico-analytical properties of associates have been studied. The method of extractive-photometric determination of verapamil in tablets has been elaborated.
Summary: Calculations of the p-ethylbenzenesulfo-acid salt (C2H5C6H4SO3-I+, I = Li, Na, K, Ag) structure have been performed by non-empirical SCF MO LCAO method using the basis sets MINI(d), 3-21 G*, MIDI(d), MP2/3-21G*, MP2/MIDI(d). It has been shown that alkaline metal ions are connected with two oxygen atoms of a sulfo-group. Silver ion is located at the equal distances from free oxygen atoms. This is correspond to non symmetric and symmetric ionic associates respectively and correlates with IR spectra of salts of dinonylnaphthalene sulfo-acid. A band splitting of antisymmetric stretching vibrations of S-O bonds has been found in the IR spectra of unhydrated salts of alkali metals but not of Ag salt. The calculation results are comparable to experimental data for sulfonic cation exchangers and for salts of dinonylnaphthalene sulfo-acid.
Kuvaeva Z. I., Gavrilyuk I. V., Mikulich A. V.
Extraction of tryptophan from water -- salt solutions of dinonyl-naphthalene sulfo-acid. pp. 28--31
Summary: It has been established that a maximum of extraction of tryptophan by dinonylnaphthalene sulfo-acid is observed at value of pH 2.5 providing approximately identical contents of cationic and zwitterionic forms of amino-acid. In this case extraction process can proceed both on ion exchange mechanism and at the expense of amino-carboxylic chain interaction. It has been determined that a maximum of extraction of amino-acid is characterized by a minimum of water sorption by extraction complexes.
Rakhman'ko E. M., Zhylko V. V., Egorov V. V.
Determination of carbonic acids and carboxyl groups in polyvi-nyl chloride. pp. 32--35
Summary: Method of determination of higher carbonic acids and carboxyl groups in polyvinyl chloride has been offered. This method is based on a reaction of acidic groups of the sample with colour reagent -- ionic associate of sulfo-phthalein dye (bromthymol blue) with trinonyloctadecylammonia in binary solvent: toluene -- tetrahydrofuran. The method has high sensitivity and good reproducibility.
Sen'kov G. M., Nikitina A. M., Agabekov V. E., Lysenko G. P.
Influence of thermo-treatment on efficiency of industrial alumina-silica catalyst of a-pinen isomerization. pp. 36--39
Summary: Influence of calcinations temperature of alumina-silica catalyst onto its activity in the isomerization of a-pinen has been investigated. It has been stated that conversion of a-pinen and its isomerization into camphen and monocyclic terpens are most optimal when calcinations temperature of catalyst is not more 500 °C.
Chizhova E. A., Klyndyuk A. I., Bashkirov L. A., Petrov G. S., Makhnach L. V., Nekrashevich E. M.
Physico-chemical properties of YBaCuFe1-xMnxO5 solid solutions. pp. 40--45
Summary: Influence of partial substitution of iron by manganese onto crystal structure parameters, thermal stability, thermal expansion, electrical conductivity, thermo-EMF, dielectric properties and magnetic susceptibility of YBaCuFe1-xMnxO5 solid solutions has been studied.
Mal'chenko N. S., Ratko A. I.
Properties of indium (III) and bismuth (III) oxides obtained from co-precipitated metal hydroxides. pp. 46--51
Summary: Peculiarities of the formation of In2O3--Bi2O3 mixed oxide obtained from metal hydroxides precipitated together have been studied. Effect of temperature and phase composition on a porous structure of samples In2O3--Bi2O3 and on a microstructure of In2O3 have been investigated.
Kol'nenkov V. P., Klimza S. V.
Modification of isotherms of binary exchanges in many-components ion-exchanging balances. pp. 52--57
Summary: Isotherms of two ions in «clear» binary and pseudo-binary exchanges for three- and four-ionic balances are compared. It has been shown that form of isotherms of pseudo-binary exchanges is analogical to «clear» binary one only in some regions of balanced compositions and it depends on ions position in a selectivity row.
Matys V. G., Poplavskii V. V., Zharskii I. M.
Electrochemical oxidation of methanol on platinum and nickel alloyed with platinum and indium as ions-beam processing. pp. 58--63
Summary: Electrochemical oxidation of methanol in alkaline medium on platinum electrode and electrodes on a base of cellular nickel alloyed with platinum and indium as ions-beam processing has been studied by cyclic voltammetry method. Influence of scan rates of potential onto position and magnitude of peak current of methanol electrooxidation has been analyzed. It has been found that electrode process is limited by reactive particles diffusion on a majority of electrodes on a base of cellular nickel. The largest electro-catalytic activity was observed on those electrodes where electrode process is limited by electrons transfer stage.
Summary: A methjd of a synthesis of nitrogen- and phosphorus-containing salts of o(m)-carborane-1-carboxilic acids has been described.
Bezborodov V. S., Kauhanka M. M., Lapanik V. I.
Synthesis of new derivates of 4-(3-alkyl-2-isoxazolin-5-yl)phenol possessed liquid-crystalline properties. pp. 68--71
Summary: Synthesis of new derivates of 4-(3-alkyl-2-isoxazolin-5-yl)phenol possessed liquid-crystalline properties has been described. This method involve 1,3-dipolar connection of nitrile oxide VI to 4-acetoxystyrene with following alkaline hydrolysis to corresponding phenol VIII. Further esterification with various acids gives desired compounds IV a-d having three or four cycles, one of which being 2-isoxazoline ring. The mesomorphic properties of obtained compounds have been presented.
Summary: The tryptophane 7-halogenase genes from pyrrolnitrine producing bacterial strains Pseudomonas aureofaciens ACN and Pseudomonas fluorescens CHAO have been synthesized by PCR method. They are cloned and expressed in Escherichia cells with use of pBSII SK+ vector.
Naumchik I. V., Karasyova E. I., Metelitza D. I.
Bioanalytical peroxidase system for melamine determination. pp. 76--78
Summary: Optimization of bioanalytical peroxidase system for the quantitative determination of melamine (MA) has been carried out. MA is an activator of the peroxidase-catalyzed oxidation of the 3,3',5,5'-tetramethylbenzidine (TMB). Optical density of the TMB peroxidation product (A455) is linearly depend on the increased concentration of MA in a range of 0.08--1.0 mM at 20 °C in 0.015 M phosphate-citrate buffer having pH 7.4 and contained 0.8 nM of horseradish peroxidase, 1 mM of H2O2 ImM of TMB and 5% DMFA. The sensitivity of proposed method (P = 0.95) was 0.046 mM of MA. The method is simple, express and has good availability of devices to compared with known methods.
Kuvaeva Z. I., Lopatic D. V., Popova O. P., Markovich M. M., Pokrovskaya A. I., Lysenko G. N.
Synthesis of aminoacid selenits. pp. 79--83
Summary: Salts of selenic acid with glycine, L-alanine, L-lysine and L-arginine have been synthesized. Some physical-chemical characteristics of amino acid selenites have been presented.
Summary: The data of modifying polymer additives to the concretes for the last years have been analyzed in the review. Main attention is focused on obtaining of sulfonated poly(olygo)mers and copolymers of styrene and its derivatives used as plasticizers for cement mortars.
Summary: Percularities of nickel cations precipitation by sodium humate and peat-alkali suspension have been established.
Dormeshkin O. B.
Combined method of thin purification of sewage. pp. 95--99
Summary: Results of the researches of thin purification of sewage of the phosphoric fertilizers productions from fluorine by combined method have been presented. An influence of basic technological parameters on a degree of purification and chemical-technological properties of the deposits formed during clearing has been investigated. Optimal conditions of technology process fulfillment have been determined. It has been established that the most fine purification is achieved when it is carried out on a base of two stage scheme of the basic purification without preliminary separation of a deposit with following suspense carbonization. The residual content of fluorine was 0.2--0.5 mg/l.
Orlovskaya L. A., Soldatov V. S., Shunkevich A. A.
Analytical characteristics of sorbent FIBAN X-1 and its application for sorption concentrating of transitional metals when water from water pipe is analysed. pp. 100--104
Summary: Some analytical characteristics of sorbent FIBAN X-1 have been investigated. Dependence of degree of detection of Zn, Cu, Pb, Cd, Ni and Mn on pH value has been studied. A group concentrating of the elements under study should be carried out in a range of pH 5.5--7.5. When initial hardness of model solutions was 3.51 and 7.0 mg-eq/1 the total amount of Mg and Ca extracted by 1 g of sorbent is 1.35 and 2.07 mg•eq/1 correspondingly. Degree of detection of all elements is practically complete. It has been proved that elaboration of express method of dynamic concentrating of heavy metals with using of FIBAN X-1 sorbent is perspective and its application shall permit to improve chemical monitoring of heavy metals in water.
Karpunin I. L, Perevoznikov V. N.
Influence of sulfides of variable valency metals and of inhibitors of radical processes onto hydrogenation of hydrolytic lignin and sulfite lyes. pp. 105--109
Summary: Catalytic action of sulfides of variable valency metals on to hydrogenation of hydrolytic lignin and lignin of sulfite lye in water alkaline solution at a presence of aluminum powder, radical inhibitor: mixture of hydrazine and phenol at an introduction of hydrogen under pressure of 100 atm at 360--380 °C has been studied.
Klimosh Yu. A., Levitskii I. A.
Peculiarities of structure formation of high fritted stonewares of low-temperature firing. pp. 110--113
Summary: Peculiarities of structure formation and phase composition of high fritted stoneware of household assignment obtained on the basis of clay raw materials of the Republic Belarus, complex flux and thinning agent at low-temperature modes of firing (1000--1050 °C) has been investigated.
Markin A. D., Dikhtievskaya L. V., Shlomina L. F., Zhdanovich I. B., Mozheiko F. F.
Influence of modifiers onto hygroscopicity of the fine-crystalline potassium chloride. pp. 114--116
Summary: Influence of series of modifiers onto hygroscopicity of the fine-crystalline potassium chloride has been investigated. High efficiency of the conditioning of KC1 by caustic soda and soda ash has been shown.
Kebich M. S. †, Kandybovich I. I., Zilbergleit M. A., Chyornaya N. V.
Optimisation of a process of hydrolytic lignin conversion with nitric acid solutions. pp. 117--120
Summary: Optimal technologic parameters of the conversion of hydrolytic lignin with nitric acid solutions have been determined under the following conditions: temperature about 40 °C, 5% nitric acid solution and treatment hydro-module 0.75.
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