Chemistry

Processing of Reaction Masses of Lewisite in Arsenic-сontain Commercial Products

Authors: Demakhin A. G., Akchurin S. V.

The article presents the results of the development of technical decisions of processing of products detoxification lewisite in the arsenic oxide (III). Shows a general scheme and the basic process steps of this process. Particular attention is paid to the method of removal of arsenic (V) from the system, which can contaminate the final product. 

Phase Diagram of the Potassium Thiocyanate – Water Binary System

Authors: Il’in K. K., Cherkasov D. G.

The phase diagram of the potassium thiocyanate–water binary system was studied by the visual polythermal method and by the method of time–temperature curves over а temperature range – 35–180 оС. There is an eutectic equilibrium at –32.6 оС in the system; the solid phases of this equilibrium are ice and individual potassium thiocyanate. The composition of the liquid phase of the eutectic state was determined.

Возможности стационарной и разрешенной во времени сенсибилизированной флуоресценции при определении некоторых тетрациклинов в мицеллярных средах

Authors: Smirnova T. D., Паращенко И. И., Zhelobitskaya E. A.

Изучены особенности влияния природы второго лиганда, мицелл ПАВ на интенсивность сенсибилизированной флуоресценции хелатов европия (III) с некоторыми производными тетрациклина. Предложен подход к флуориметрическому определению суммы трех тетрациклинов и повышению избирательности, заключающийся в измерении интенсивности эмиссии хелатов с помощью стационарной и разрешенной во времени флуоресценции. Установлено оптимальное время задержки измерения

Rapid Determination of Tetracyclines in Milk by the Method of Mass Spectrometry High Resolution

Authors: Amelin V. G., Amelin A. I.

The method of determination of tetracycline antibiotics (tetracycline, chlortetracycline, oxytetracycline, doxycycline) in the milk of methods HPLC-MS/MS/MS and HPLC-QTOF-MS, with a simple and rapid sample preparation. The ranges defined concentrations of tetracyclines in milk sample of 1 g was 1–200 μg/kg. Relative standard deviation of the results of the analysis does not exceed 7%. The analysis duration 30–40 minutes.

Reduction Reaction of 2,4-Diaryl-7,8-benzo-5,6-dihydroselenochromens

Authors: Drevko B. I., Fedotova О. V., Drevko Y. B., Osina T. S.

First held reduction reaction of benzannelated hexahydroselenochromenes. Reduction was carried out by ionic hydrogenation, which has led to under-previously unknown benzannelated hexahydroselenochromenes. It has been found that the reduced products are obtained generally in the form of a mixture of two isomers in a ratio of 1: 1.

Study of the Stable Tetrahedron LiF-KF-KCl-K2WO4 of the Quinary Reciprocal System Li,K||F,Cl,WO4

Authors: Pichkaev О. V., Dvoryanova Е. М., Garkushin I. K.

The stable tetrahedron LiF-KF-KCl-K2WO4 of the quinary reciprocal system Li,K||F,Cl,WO4 was studied by differential thermal analysis, and the characteristics of eutectic and peritectic were determined.

Using Polymeric Sorbent Technologies for Ecology Monitoring of Water Objects

Authors: Bayburdov T. А., Berizovskaya E. I., Vasin V. V., Goncharov V. M., Malinin A. V., Perelygin V. S., Stupen'kova L. L., Yurasov N. A.

In this paper the high efficiency of the anionic absorbent polymer in the sorption and desorption of samples of aqueous solutions of organic substances. Recommended that the optimal conditions for use as a sorbent sample of water objects of the environment in the process of chemical and analytical monitoring of environmental pollutants of natural and anthropogenic origin.

Influence of the Modifying Additive Nature on the Rheological Properties of the Concentrated Chitosan–Organic Acid–Water System

Authors: Fomina N. V., Malinkina О. N., Gegel N. O., Shipovskaya A. B., Abramov А. Y.

The influence of the nature of a modifying additive selected from the class of stabilizers and thickeners (high-molecular-weight chitosan, starch, xanthan gum, sorbitol, and pyridoxine hydrochloride) on the rheological properties of the concentrated chitosan–organic acid– water system (freshly prepared or stored at 4 and 20°C) was studied. It is shown that all the modifiers have a stabilizing and thickening effect, resulting in an increased viscosity of the multicomponent system and a lower rate of its fall in time.

Identification of Oils from Samara Region Using Principal Component Analysis and Factor Discriminant Analysis

Authors: Lobachev А. L., Fomina N. V., Monakhova Y. B.

Development of methods for identification of oils is of high priority in oil industry. The following parameters for 2963 oil samples from five oilfields in the Samara region were determined: density, fraction yield at 200 °C and 300 °C, the mass fraction of sulfur, hydrogen sulphide, methyl and ethyl mercaptan, the mass concentration of chloride salts, the saturated vapor pressure. The matrix of experi- mental data was analyzed using principal component analysis (PCA) and factorial discriminant analysis (FDA) methods.

A Quantum Chemical Substantiation of the Intermediate Nature and Regioselectivity of Homolytic Oxidative Coupling of L-cysteine

Authors: Pankratov A. N., Tsivileva O. M., Tsymbal O. A.

A quantum chemical substantiation of the intermediate (thiyl radical) nature and reaction regioselectivity (S,S-coupling) of the L-cysteine homolytic oxidative dimerization resulting by the L-cystine formation has been carried out. The electrostatic factor does not prevent the reaction occurrence.

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