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For the metrological assurance of the high-precision inductively coupled plasma (ICP) mass spectrometry and optical emission spectroscopy methods, the All-Russian Scientific Research Institute for Optical and Physical Measurements (VNIIFTRI) has launched works on the development of reference materials (RMs) of the mass fraction of metals in solutions specifically intended for measurements using inductively coupled plasma methods (ICP-CRM). The ICP-CRM under development was represented by a solution with the certified value of the lead mass fraction. The ICP-CRM was packed in high-density polyethylene bottles with the capacity of 4, 8, 15, 30, 60 and 125 cm 3 . The certified value of the lead mass fraction in the solution was established by the preparation method and confirmed by the GET 217-2018 State Primary Standard for units of the mass fraction and mass (molar) concentration of inorganic components in aqueous solutions based on gravimetric and spectral methods. The permissible certified values of the lead mass fraction in the developed ICP-CRM are shown to range from 800 mg / kg to 1200 mg / kg. The uncertainty in the certified value is expressed as expanded uncertainty, U = 0,5 % at 95 % confidence, and is calculated in accordance with ISO/IEC 17025 according to GUM (Guidelines to Uncertainty in Measurement). The developed ICP-CRM solution of the lead mass fraction can be used for ensuring the metrological traceability of measurements in inorganic analyses using ICP-MS and ICP-OES to the GET 217-2018.

The metrological characteristics of GET 217–2018, the State Primary Standard of the unit of mass fraction and unit of mass (Molar) concentration of inorganic components in aqueous solutions based on gravimetric and spectral methods, are presented. The composition and operating principle of GET 217–2018 and the method used in reproduction and transmission of the two units are described. Information about international key comparisons is presented.