Development of Simulator Reference Materials of Oleic Acid Mass Fraction in Sunflower Seed Oil

The article presents the results of studying of nuclear magnetic relaxation characteristics of protons, which contain in various organosilicon fluid brands, with the aim of justifying the possibility of their use in the development of simulator reference materials (RMs) of oleic acid mass fraction in sunflower seed oil. The data characterizing the NM-relaxation characteristics of organosilicon liquids, varying in a viscosity index, are provided. Based on the range of changes in the time of spin-spin relaxation of protons containing in oil of sunflower seeds with various mass fraction of oleic acid (157-200 msec) there are select silicon organic fluids, that allow the most accurate simulation of wave-form envelopes of oil protons spin echo signals in the seeds. The simulator reference materials under development are intended for use in the calibration of NMR-analyzers for determination of oleic acid mass fraction in of sunflower seed oil.

Development of certified reference materials for physicochemical analysis. Certified reference solutions for the composition of aqueous aluminum, indium, magnesium, nickel and titanium

This paper presents information on the development and certification of reference materials (CRM) for the composition of aqueous aluminium, indium, magnesium, nickel, and titanium solutions.CRMs are represented by aqueous solutions containing aluminium, indium, magnesium, nickel, and titanium ions. CRMs have been packed into 5, 10 and 25 cm3 glass ampoules, as well as into 50 and 250 cm3 polypropylene vessels. The certified values of metal mass concentrations were established according to the preparation method.The certified value of the mass concentration of metal ions in the CRMs under study is found to vary within the range of 0.95–1.06 g/dm3. Both the relative expanded uncertainty (under k= 2) of the certified mass concentration and the relative standard uncertainty due to instability do not exceed the values of 0.8 % and 0.069 %, respectively. The developed CRMs are shown to have the shelf life of 3 years provided that standard storage conditions are ensured. The developed CRMs are included into the RF State Register of Certified Reference Materials under the following numbers: CRM 11122–2018, CRM 11123–2018, CRM 11124–2018, CRM 11125–2018, and CRM 11126–2018. The CRMs produced by the All-Russian Research Institute for Optical and Physical Measurements (VNIIOFI) are characterized by the values of expanded uncertainty comparable to those of world leaders in the production of similar materials.

The problem of improving the quality of seriously issued certified reference materials of the composition of gas mixtures

Currently, in the Russian Federation, the metrological traceability of certified reference materials of the composition of gas mixtures in cylinders under pressure produced by manufacturers of certified reference materials is carried out in accordance with GOST 8.578-2014. Considering that certified reference materials of the composition of gas mixtures in cylinders under pressure are used for testing to approye the type of measuring instruments, verification, calibration, and graduation of gas-analytical measuring instruments used to control explosive gases and vapors, harmful components in the atmospheric air and the air of the working area, emissions from vehicles and enterprises, to control technological processes, the quality of hydrocarbon products, etc., the issue of ensuring the quality of seriously produced certified reference materials (about 100.000 cylinders with gas mixtures per year) is important. To ensure the quality of certified reference materials of gas mixtures in cylinders under pressure, mass-produced by manufacturers of certified reference materials, we offer the following actions:– manufacturers of certified reference materials’ passing of mandatory accreditation for compliance with the requirements of GOST ISO Guide 34–2014 and GOST ISO Guide 35–2015;– manufacturers of certified reference materials’ constant participation in the proficiency testing programs through interlaboratory tests;– actualizing and refining the existing set of standards defining the requirements for the entire life cycle of a certified reference material of a gas mixture in a cylinder under pressure;– improving the method of certification of a reference material by calculating the value of the expanded uncertainty of the reference material and the introducting a new coefficient «technological reserve».

Development of reference materials for thermodynamic properties: metrological support of measurements in the field of thermal analysisand calorimetry in Russia

This paper is aimed at analysing the current state and prospects of metrological support and standardisation in the field of thermal analysis in Russia. Main characteristics of reference materials used for testing, graduating, calibrating, and verifying thermal analysis instruments are described.

Radiation-sensitive film compositions for measuring absorbed doses within the 100-1000 Gy range

This work was aimed at investigating the spectral features and dose sensitivities of film dosimetry systems developed at the All-Russian Research Institute for Physical-Engineering and Radiotechnical Metrology (VNIIFTRI) and approved as absorbed-dose reference materials. The properties of new radiation-sensitive compositions for high-intensity ionising radiation in the absorbed-dose range from 100 to 1000 Gy were studied. Dosimetric measurements in this range are in demand in the sphere of ionising radiation technologies used in agriculture and food-processing industries.