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

The need for developing metrological support for the measurement of gas components in metals and alloys and trace impurities in various industrial products (metallurgy, medicine, etc.) is analyzed. The authors examine the needs of industries for the development of more sensitive measurement methods and procedures, as well as an expanded nomenclature of reference materials having a lower error (uncertainty) of the certified characteristic than the certified characteristic error of currently existing type-approved composition reference materials. Reference materials developed for use in state regulation should be traceable to the primary standards of mass (molar) fraction and mass (molar) concentration: GET 196-2023 State Primary Standard for the units of the mass (molar) fraction and mass (molar) concentration of components in liquid and solid substances and materials based on spectral methods; GET 176-2019 State Primary Standard for the units of mass (molar, atomic) fraction and mass (molar) concentration of components in liquid and solid substances and materials based on coulometry; GET 217-2018 State Primary Standard for the units of mass fraction and mass (molar) concentration of inorganic components in aqueous solutions based on gravimetric and spectral methods; GET 208-2019 State Primary Standard for the units of mass (molar) fraction and mass (molar) concentration of organic components in liquid and solid substances and materials based on liquid and gas chromatography-mass spectrometry with isotope dilution and gravimetry.

The need for and ways of developing and creating a metrological support system for Raman spectrometry in the Russian Federation are analyzed, including to confirm the traceability of units for quantitative Raman analysis. To address these issues, GET 196-2023 includes sulfur, carbon, and hydrogen analyzers; an inductively coupled plasma mass spectrometer; and a Raman system. The composition and metrological characteristics of GET 196-2023 are presented. In addition, a draft state hierarchy scheme for instruments measuring mass (molar) fraction and mass (molar) concentration, as well as fluorescence, of components in liquid and solid substances and materials based on spectral methods has been developed and presented. The draft state verification scheme establishes the procedure and methods for transferring the units of the mass (molar) fraction (in absolute units) and mass (molar) concentration of components (grams per cubic decimeter; mole per cubic decimeter) from GET 196-2023 to measuring instruments with indication of measurement error and uncertainty. Also, secondary and working standards are used to transfer relative fluorescence units to measuring instruments.