Actuality of the research. The need for the development and validation of analysis methods of reagents used for the introduction of elements into reference materials, certified according to the procedure ofpreparation. The purpose. Development and certification of methods for determining the content of the main component in the reagents used to prepare reference materials. Research methods. Gravimetry, titration, atomic emission spectral analysis with arc excitation, atomic emission spectral analysis with inductively coupled plasma as an excitation source, mass spectral analysis with inductively coupled plasma as ion source. Results. The characteristics of the error of the measurement results are estimated, the Certificates of Attestation of the methods are received, the information is included in the Federal Information Fund.