State primary standard of units of mass (molar) fraction and mass (molar) concentration of components in liquid and solid substances and materials based on spectral methods GET 196-2023

Abstract

The necessity of the development of metrological support for measurements of the content of gas components in metals and alloys, trace impurities in various industrial facilities (metallurgical, medical, etc.) is analyzed. The needs of industries in the development of more sensitive measurement methods and techniques, standard samples of expanded nomenclature with a lower error (uncertainty) of the certifi ed characteristics than the error of the certifi ed characteristics existing today are studied day of standard samples of the approved type of composition. The standard samples being developed for use in the fi eld of state regulation should be traced to the primary standards of mass (molar) fraction and mass (molar) concentration: the State primary standard of units of mass (molar) fraction and mass (molar) concentration of components in liquid and solid substances and materials based on spectral methods GET 196-2023, the State primary standard of units mass (molar, atomic) fraction and mass (molar) concentration of components in liquid and solid substances and materials based on coulometry GET 176-2019, State primary standard of units of mass fraction and mass (molar) concentration of inorganic components in aqueous solutions based on gravimetric and spectral methods GET 217-2018, State primary standard of units of mass (molar) fraction and and mass (molar) concentration of organic components in liquid and solid substances and materials based on liquid and gas chromatography-mass spectrometry with isotopic dilution and gravimetry GET 208-2019.The need and ways of developing and creating a system of metrological support for Raman spectrometry in the Russian Federation, including in order to confi rm the traceability of units of quantities for quantitative Raman analysis, are analyzed. To solve these issues, the GET 196-2023 includes sulfur, carbon and hydrogen analyzers, an inductively coupled plasma mass spectrometer and a Raman complex. The composition and metrological characteristics of GET 196-2023 are presented. A draft state verifi cation scheme for measuring the mass (molar) fraction and mass (molar) concentration, as well as the fl uorescence of components in liquid and solid substances and materials based on spectral methods has been developed and presented. The draft of the state verifi cation scheme establishes the procedure and methods for transferring units of mass (molar) fraction of components (in absolute units), mass (molar) concentration of components (grams per cubic decimeter, mole per cubic decimeter) from GET 196-2023 to measuring instruments indicating the error and uncertainty of measurements. Also, with the help of secondary and working standards, relative units of fl uorescence are transmitted to measuring instruments.