Analytica Expo: parade of innovations DOI: 10.22184/2227-572X.2021.11.3.180.200
From 13 to 16 April 2021, the international exhibition of laboratory equipment and chemical reagents Analytica Expo was held for the 19th time at the exhibition center Crocus Expo. The exhibition showed: the equipment is becoming smarter, the analysis process is faster, the work of the staff of analytical laboratories is more technologically Our correspondents got acquainted with the exhibition exhibits, noted the most current trends in the development of laboratory equipment and appreciated the advanced models that meet the most demanding and daring requests of industry specialists.
Classification of chemical elements in biomedical research DOI: 10.22184/2227-572X.2021.11.3.234.239
New analytical methods are emerging for solving biomedical problems. New data about the concentration of minor elements in biological tissues appear in research. The role of minor elements in chemical reactions in the body can be considered by analogy with the behavior of the already studied elements. The existing classifications of chemical elements are unable to group elements according to their similar role in metabolism based on chemical similarity. The authors in the article consider the existing classifications of the chemical elements of biological systems and propose a classification adapted for the analytical tasks of fundamental medicine.
The application of isotope mass spectrometry to identify facts of falsification and determine the place of origin of bee products DOI: 10.22184/2227-572X.2021.11.3.202.207
The results of the study of the isotopic composition of various varieties of honey according to the Protocol of analysis AOAC 998.12, which has been widely used in the EU, USA, Canada, Australia, etc. for many years, are presented. The paper discusses a methodology for detecting falsified beekeeping products and confirming the region of their origin, based on an assessment of the isotopic ratios of a number of light elements. For measurements it is recommended to use HPLC–IRMS – isotope mass spectrometer Elementar (UK). The advantages of the proposed method are shown in comparison with other methods of assessing the quality and authenticity of the origin of honey.
Future use of modified by high enriched nitrogen 15 silicon nitride as a fuel element shell material DOI: 10.22184/2227-572X.2021.11.3.208.217
The properties of ceramics based on silicon nitride and composites based on silicon nitride and silicon carbide are considered. The importance of creating new materials for claddings of fuel elements (fuel rods) instead of zirconium alloys, which can react with water vapor, creating explosive mixtures based on hydrogen, is noted. The experience of JSC VNIINM in the creation of new materials based on silicon carbide for use as fuel rod cladding is presented and the possibility of using for this purpose mixed composites based on silicon carbide and silicon nitride modified with enriched nitrogen 15 isotope is shown. The prospects for the creation of a large-scale production of nitrogen 15 for the nuclear power industry as a component of mixed uranium-plutonium nitride fuel and the possibility of its use in the manufacture of fuel element cladding from a SiC / Si3N4 composite are considered.
The fusion method in X-ray fluorescence (XRF) analysis is an effective sample preparation technique for getting accurate analysis results of powder samples, since the technique eliminates heterogeneity due to grain size and mineralogical difference. In addition, the homogenization of material property by vitrification makes it possible to expand the calibration range by the use of synthetic standards of fused beads with reagents or by using diverse reference materials.
This application note demonstrates that single calibration for diverse materials, such as minerals, ores and refractories, was established by the fusion method on the Supermini200, a benchtop wavelength-dispersive XRF spectrometer.
Determination of chlorine compounds in petroleum products DOI: 10.22184/2227-572X.2021.11.3.224.228
Issues of determining the content of organochlorine compounds (OCC), the presence of which strongly affects the transportation and processing of hydrocarbons, are discussed. The classification of OCC according to their effect on equipment is given and methods of eliminating their negative effects are described. Methods for the quantitative determination of OCC in oil are considered, with a special emphasis on chromatography. The requirements for chromatographic equipment for the analysis of petroleum products are listed and substantiated. The issues of sample preparation and analysis automation are touched upon. Examples of equipment for quantitative analysis of various OCC are given.
On the modern features of the recognition of accredited laboratories in the Russian Federation DOI: 10.22184/2227-572X.2021.11.3.230.232
The article discusses the current features of the practice of recognizing the equivalence of accreditation of testing laboratories of the national accreditation system in Russia and accreditation issued by other, including Russian, members of the ILAC and APLAC MRA agreements.
Project of the Faculty of Chemistry, Moscow State University M. V. Lomonosov and the Polytechnic Museum. From the history of instrumentation in gas chromatography in the 1940s – early 1970s. Part 2 DOI: 10.22184/2227-572X.2021.11.3.240.250
During the formation of the chromatographic collection of the Polytechnic Museum, much attention is paid to the disclosure of the historical significance of the exhibits presented in it, the memorialization of information concerning the creators of scientific instruments. Part 1 of this article was devoted to the development of instrument making in the field of gas chromatography abroad during the 1940s – 1960s. Part 2 describes the pioneering activities in this direction of individual representatives of the Soviet scientific community in the 1950–1970s. Information about the development and production of some samples of Soviet laboratory and industrial gas chromatographs is presented. The history of the creation, designation and constitution of the laboratory gas chromatograph LHM 8MD from the funds of the Polytechnic Museum are analyzed.