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Chemical Analysis Metrology
Yu. V. Gracheva
Estimation of Measurement Uncertainty During Calibration of Laboratory Metering Devices In accordance with the requirements of GOST ISO / IEC 17025-2019 General requirements for the competence of testing and calibration laboratories, a laboratory performing calibration, including its own equipment, must assess the measurement uncertainty for all calibrations. The article describes an algorithm for estimating measurement uncertainty in the calibration of laboratory metering devices. In particular, we consider the measurement uncertainty budget for calibration of a Proline Mechanical Pipette BIOHIT Sartorius pipette dispenser with a variable dosing volume.
Estimation of Measurement Uncertainty During Calibration of Laboratory Metering Devices In accordance with the requirements of GOST ISO / IEC 17025-2019 General requirements for the competence of testing and calibration laboratories, a laboratory performing calibration, including its own equipment, must assess the measurement uncertainty for all calibrations. The article describes an algorithm for estimating measurement uncertainty in the calibration of laboratory metering devices. In particular, we consider the measurement uncertainty budget for calibration of a Proline Mechanical Pipette BIOHIT Sartorius pipette dispenser with a variable dosing volume.
Tags: calibration contribution to uncertainty laboratory metering devices uncertainty uncertainty budget бюджет неопределенности калибровка лабораторные дозирующие устройства
Analytical Methods and Instruments
K. S. Sychev, E. A. Okunskaya, I. A. Galushko
The Use of Isocratic HPLC in Reverse Phase and Hydrophilic Modes for the Group Determination of Antibiotics of Various Classes Chromatographic conditions for isocratic HPLC determination in reverse phase and hydrophilic modes of a number of widely used antibiotics are described. In particular, examples are given of the group separation of sulfamides, quinolones and cephalosporins, as well as a set of antibiotics used in veterinary medicine, including nitroimidazoles, lincosamides, tetracyclines, sulfonamides and quinolones. It is argued that the widespread use of gradient elution for HPLC determination of antibiotics (to the detriment of the more practical isocratic approach) is mainly due to the use of insufficient quality stationary phases, as well as stationary phases with suboptimal selectivity. The results are illustrated with real examples of HPLC separations developed by specialists of the IP company Sychev KS / I.B.S.
The Use of Isocratic HPLC in Reverse Phase and Hydrophilic Modes for the Group Determination of Antibiotics of Various Classes Chromatographic conditions for isocratic HPLC determination in reverse phase and hydrophilic modes of a number of widely used antibiotics are described. In particular, examples are given of the group separation of sulfamides, quinolones and cephalosporins, as well as a set of antibiotics used in veterinary medicine, including nitroimidazoles, lincosamides, tetracyclines, sulfonamides and quinolones. It is argued that the widespread use of gradient elution for HPLC determination of antibiotics (to the detriment of the more practical isocratic approach) is mainly due to the use of insufficient quality stationary phases, as well as stationary phases with suboptimal selectivity. The results are illustrated with real examples of HPLC separations developed by specialists of the IP company Sychev KS / I.B.S.
Tags: antibiotics gradient elution hplc isocratic hplc determination stationary phases антибиотики вэжх градиентное элюирование изократическое вэжх-определение неподвижные фазы
Water Purification Systems Aquinity² E35 / 70
For more than a quarter of a century, the German company membraPure has been successfully operating in the market of pure and ultrapure water systems, analyzers of total organic carbon and amino acids, as well as ion chromatographs. The company’s specialists are constantly improving equipment, developing new tools, using extremely advanced technologies in their work. The manufactured products do not require special maintenance and are provided with online service support. High-tech tools are in good demand and are sold worldwide through the dealer network and the company’s own offices.
Tags: edi cell pure and ultrapure water reverse osmosis обратный осмос чистая и сверхчистая вода ячейка edi
Carousel – a New Attachment of the Company SIMEX With Automatic Feeding of Samples During Registration Transmission Spectra on FT 801 / 803 FT-IR Spectrometers
SPF SIMEX (Novosibirsk, Akademgorodok) specializes in the development and production of infra-red spectral devices, of which the most popular are: FT 801 FT-IR spectrometer, MICRAN series IR microscopes for working with micro-objects from 5 microns, MATR and ATR attachments (with diamond and other crystals, with heated diamond and a temperature controller, with ultraviolet irradiation of the sample), an RLC attachment for express analysis of liquids with online adjustment of the layer thickness by absorption, as well as with a magnetic cell for quantitative analysis at four layer thicknesses liquids, attachment of diffuse reflection PRIZ, which additionally implements one of the methods of IR microscopy – the method of double passage through the sample, rolled on a mirror substrate. 560 devices of the SIMEX company operate today in 140 cities of Russia and abroad.
multiple broken total internal reflection
multiple broken total internal reflection
Tags: ftir spectrometer ir microscope magnetic cell thermal controller ик-микроскоп ик-фурье-спектрометр магнитная ячейка термоконтроллер
N. N. Gerasimenko
Ultimate Solution for Accurate Cement Phase Analysis A method of combined phase analysis with preliminary determination of the elemental composition of polycrystalline materials using the Smart X–Combo system, consisting of two bench-top instruments: a wave-dispersive X-ray fluorescence spectrometer (XRF) and an X-ray diffractometer (XRD), is presented. A comparison is made with the traditional phase analysis, which uses calculations by the Boge method. Using the example of Portland cement, the advantages of an integrated approach to assessing the phase composition of powder samples are shown.
Ultimate Solution for Accurate Cement Phase Analysis A method of combined phase analysis with preliminary determination of the elemental composition of polycrystalline materials using the Smart X–Combo system, consisting of two bench-top instruments: a wave-dispersive X-ray fluorescence spectrometer (XRF) and an X-ray diffractometer (XRD), is presented. A comparison is made with the traditional phase analysis, which uses calculations by the Boge method. Using the example of Portland cement, the advantages of an integrated approach to assessing the phase composition of powder samples are shown.
Tags: cement production elemental analysis phase analysis x-ray diffraction x-ray fluorescence spectroscopy производство цемента рентгеновская дифракция рентгенофлуоресцентная спектроскопия фазовый анализ элементный анализ
Russian Spectrometers for Control Composition of Metals and Alloys
The research and production company Spectral Laboratory was established in 1992 in St. Petersburg by a group of specialists with long-standing traditions in the development of optical, mechanical, electronic components and equipment, experience in the production of spectrometric equipment and a large research and development potential. The main activity of the company is the development and production of new equipment for the spectral analysis of the composition of metals and other materials.
Tags: elemental composition of matter emission spectrometer spectral analysis thermostating спектральный анализ термостатирование элементный состав вещества эмиссионный спектрометр
Laboratory Accreditation
I. V. Boldyrev, T. Ya. Selivanova
Features of the Definition of Qualitative Properties. Laboratory Requirements In 2017, a new edition of the international standard was adopted, which was translated into Russian and entered into force in 2019 – GOST ISO / IEC 17025-2019 Conformity assessment. General requirements for the competence of testing and calibration laboratories. The issues of determining the nominal properties of an object, which do not have units of measurement, are discussed. The nominal properties can be determined are listed. It is noted that a general methodology for determining nominal properties has not been developed, therefore, individual successful attempts to establish a unified approach to methods for determining specific types of nominal properties do not solve the problem as a whole. As a result, the standards contain descriptions of techniques that obviously cannot be considered sufficiently complete. Recommendations for the verification of methods for determining nominal properties in testing laboratories are given.
Features of the Definition of Qualitative Properties. Laboratory Requirements In 2017, a new edition of the international standard was adopted, which was translated into Russian and entered into force in 2019 – GOST ISO / IEC 17025-2019 Conformity assessment. General requirements for the competence of testing and calibration laboratories. The issues of determining the nominal properties of an object, which do not have units of measurement, are discussed. The nominal properties can be determined are listed. It is noted that a general methodology for determining nominal properties has not been developed, therefore, individual successful attempts to establish a unified approach to methods for determining specific types of nominal properties do not solve the problem as a whole. As a result, the standards contain descriptions of techniques that obviously cannot be considered sufficiently complete. Recommendations for the verification of methods for determining nominal properties in testing laboratories are given.
Tags: conformity assessment quality properties reference materials screening testing verification верификация испытание качественные свойства оценка соответствия скрининг стандартные образцы
Historic chapters
E. I. Matievskaya, E. A. Baum
Project of the Department of Chemistry of Lomonosov Moscow State University and the Polytechnic Museum. From the History of Gas Chromatography Instrumentation in the 1940s – early 1970s. Part 1 In 2020 several issues of the magazine Analytics (No. 2 and 4) contained information about the new project of the Chemistry Department of Moscow State University and the Polytechnic Museum, which is dedicated to the attribution of artifacts by students of the Department studying the history of chemistry. During the organization of the Polytechnic Museum’s collections in terms of the prospects for their development, it is of great interest to clarify the place of the material sources presented in its in the context of considering the evolution of chromatographic equipment. This article is devoted to historical investigation of appearance in the domestic market of analytical equipment of the laboratory gas chromatograph LHM 8MD (it was put into mass production in 1972 by the factory Mosneftekip), which is one of the exhibits of this collection. In this regard part 1 describes the formation and development of instrument making in the field of gas chromatography abroad for the period 1940s – 1960s.
Project of the Department of Chemistry of Lomonosov Moscow State University and the Polytechnic Museum. From the History of Gas Chromatography Instrumentation in the 1940s – early 1970s. Part 1 In 2020 several issues of the magazine Analytics (No. 2 and 4) contained information about the new project of the Chemistry Department of Moscow State University and the Polytechnic Museum, which is dedicated to the attribution of artifacts by students of the Department studying the history of chemistry. During the organization of the Polytechnic Museum’s collections in terms of the prospects for their development, it is of great interest to clarify the place of the material sources presented in its in the context of considering the evolution of chromatographic equipment. This article is devoted to historical investigation of appearance in the domestic market of analytical equipment of the laboratory gas chromatograph LHM 8MD (it was put into mass production in 1972 by the factory Mosneftekip), which is one of the exhibits of this collection. In this regard part 1 describes the formation and development of instrument making in the field of gas chromatography abroad for the period 1940s – 1960s.