Certified Reference Materials of Alkyl Carbonates and Multicomponent Solution of Alkyl Carbonates

   The article presents information on the development of new types of certified reference materials (СRMs) for the composition of individual alkyl carbonates and СRM for the composition of a multicomponent solution of alkyl carbonates in methanol, provided with metrological traceability to GET 208-2024. A description of the procedure for preparation and certification of СRMs is provided, including studies of material homogeneity and stability. The features of certification of a multicomponent solution of organic substances of the same homologous series are described. The certified characteristic of СRMs for the composition of alkyl carbonates is the mass fraction of the main component in the pure substance (from 99.54 to 99.97 %) with a relative expanded uncertainty not exceeding 0.25 %. The certified characteristic of СRM for the composition of a multicomponent solution is the mass concentration of individual alkyl carbonates in methanol (from 1.99 to 2.01 mg/cm³) with a relative expanded uncertainty of certified values of 1.5 %.

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