Sviridova Т.G., Salnikova Е.V., Romanenko N.A., Kanygina O.N.
CONCENTRATION OF ORGANOCHLORINE PESTICIDES ON THE SURFACE OF C₁₈-HYBRID SILICA GEL FOR SAMPLE PREPARATION IN WATER QUALITY CONTROL METHODS ^{[№ 12 ' 2017]}
The solid-phase microconcentration of organochlorine pesticides (alpha-hexachlorocyclohexan (α-HСН), gamma-hexachlorocyclohexan (γ-HСН) and a 4.4-dichlordifeniltrikhloretan (4.4-DDT) on the surface of the sorbent C₁₈-hybrid silica gel, is an alternative to the classical method of preparing water samples for gas chromatographic analysis on the separation of two liquid phases. The need for a transition to solid-phase extraction of samples is dictated by the fact that this modern method significantly saves the sample preparation time, reduces the number of races of walking materials several times, and also avoids secondary contamination of samples. The degree of extraction of pesticides from water samples was analyzed in static and dynamic conditions. The conditions of sorption extraction were optimized by varying the type of desorbent solution and the contact time of the phases. As a result, it was shown that the nature of the desorbent had no significant effect on the time to achieve sorption equilibrium, but an increase in the extraction rates of organic pesticides with an increase in the volume fraction of acetone in n-hexane was observed. In addition, it was found that the degree of recovery of 4.4-DDT in all variants of the experiment was lower in comparison with α-HСН and γ-HСН in similar conditions. The use of dynamic mode with the use of the semi-automatic microsyringe SGE-Chromatec eVoL^XR made it possible to slightly increase the recovery of all organochlorine pesticides used in comparison with the corresponding experiments in the static regime. In general, the results confirm the possibility of switching to this method of preparation of water samples for analytical control over the content of the examined organochlorine pesticides in the samples, and the calculated characteristics of the extraction rates make it possible to carry out the studies without losing the quality of the analysis.

Romanenko N.A., Sviridova Т.G., Salnikova Е.V.
ADHESION OF CELLS OF ESCHERICHIA COLI K-12 ON A SURFACE OF THE ORGANOMODIFIED SORBENTS ON THE BASIS OF SILICA GEL ^{[№ 9 ' 2017]}
Adhesion of cells of microorganisms on the surface organomodification sorbents for microextraction when working with the solutions containing chemical and biological pollyutant is an obligatory link in a chain of in the chain of physico-chemical interactions in the quantitative analysis. At the same time questions of efficiency of definition of chemical analytes in such systems are often connected with deterioration in accuracy and reproducibility of an analytical method. It is defined first of all by features of a structure of sorbents — porosity, high surface area, existence and the structure of the imparted functional groups. So, by preparation of tests of water by method of solid-phase microextraction for gas chromatography definition of organochlorine pesticides (the alpha and scale of isomers of hexachlorocyclohexane (α–HCH and γ-HCH) and a 4.4-dichlorodiphenyltrichloroethane (4.4-DDT)), is possible adhesion cells of Escherichia coli K-12 which are contained in natural sources as on silica gels with the surface modified by C₁₈-hydrocarbonic groups, and on the classical granulated silica gel without modification. Besides, the question of efficiency of microextraction of pesticides from the model solutions containing a suspension of E. coli cells demands studying. As a result of a research the high connecting ability of silica gels in relation to microorganisms has been shown. Timed establishment of sorption balance didn’t exceed 30 minutes, and the coefficient of distribution of microorganisms V_s when using unmodified silica gel was higher, in comparison with that for silica gel with a surface, containing the imparted functional C₁₈ groups that demonstrates smaller adhesive ability of the last. At joint sorption of microorganisms and organochlorine pesticides the distribution coefficient significantly didn’t differ from that, calculated earlier. At the same time indicators of efficiency of extraction 4.4-DDT decreased against the background of minor change of extent of extraction of HCH isomers. Thus, the situation of joint sorption of the studied pesticides and cages of E. coli without loss for quality of the analysis is represented possible.

Kazaeva A.N., Kobzev G.I., Sviridovа T.G., Gryazeva I.V., Sviridov A.P.
STUDY OF THE MECHANISM OF PRO– AND ANTIOXIDANT ACTIVITY OF 1,3-DIHYDROXY-5-METHYLBENZENE ^{[№ 10 ' 2013]}
Method MCSCF (multiconfiguration self-consistent field method) simulated the interaction of 1,3-dihydroxy-5-methylbenzene (C1-AHB) and its phenoxyl radical (C1-AHB^•) with some reactive forms of oxygen. According to the results of quantum chemical calculations of activation barriers of direct and inverse reactions shown antioxidant activity of C1-AHB towards hydroxyl (OH^•), hydroperoxide (HO₂^•) radicals and singlet oxygen ¹O₂ and the predicted antioxidant phenoxyl radical C1-AHB^• against hydroperoxide radical HO₂^•. At the same time the opportunity of pro-oxidant effect of C1-AHB against singlet oxygen ¹O₂ (а¹Δ_g) to generate a response in the last ¹C1-AHB^• + ¹HO₂^• = ¹C1-AHB + ¹O₂. The calculated data are experimentally confirmed in a model system "Peroxidase — H₂O₂ — Luminol".

Terentyeva T.A., Sviridova L.A., Kayasheva A.S, Vasilyeva E.N.
ORGANIZATION OF SEPARATE ACCOUNT OF THE CHARGE OF THE MEDIA, RECOVERED THROUGH SUBSIDIES ^{[№ 13 ' 2012]}
In the article the authors' position on the need to separate accounting subsidies allocated from the regional budget and income derived from operating activities in the accounting of government and commercial organizations. Detailing proposed costs under calculation will help to justify the inclusion of the cost of the intellectual product created by the media.

Sviridova L.A.
CLASSIFICATION OF COSTS IN ADVERTISING COMPANIES ACCOUNTING ^{[№ 13 ' 2011]}
The article includes the author's position on the need to select an accounting advertising company of unified items costing direct costs, grouped in areas of promotional activities related to production and distribution of advertising. The proposed specification requirements under pricing, will help to justify the inclusion of the cost of advertising.

^{[№ 10 ' 2008]}

Tuyakova Z.S., Sviridova L.A.
ORGANIZATIONAL-METHODIC ASPECTS OF EXPENSES ACCOUNTING ON ADVERTISING PRODUCT CREATION ^{[№ 5 ' 2007]}
The problems of expenses capitalization on advertising reels creation and other audiovisual products and questions of original documents of these expenses accounting forming are regarded in this article. The authors prove their position of expenses capitalization of some advertising types on the base of comparative analysis of approaches to confession of fictitious assets objects in accordance with demands of the Russian and international standards of financial book-keeping.