A.S. Sergeeva, A.V. Kasilyunas, O.S. Golynets
Ural Scientific Research Institute of Metrology (UNIIM) — Affiliated Branch of the D.I. Mendeleev All-Russian Scientific Research Institute of Metrology (VNIIM), Yekaterinburg, Russia;
sergeevaas@uniim.ru
Al’manac of Modern Metrology № 2 (38) 2024, pages 65–77
Abstract. The article discusses the stages of development of the first Russian certified reference materials (СRMs) of chocolate compositions GSO 12274-2023 / GSO 12276-2023 with certified values of mass fractions of moisture, nitrogen, protein, fat and ash. Milk, bitter and white confectionery chocolate in the form of drops (callets) are chosen as the material for the СRMs. The certified value of the mass fraction of moisture is established using the thermogravimetric method on GET 173, the mass fractions of nitrogen and protein — using acid-base titration according Kjeldahl method on GVET 176-1, which is traceable to GET 176. The measurement procedures based on the Randall extraction-gravimetric method and the thermogravimetric method to measure the mass fractions of fat and ash, respectively, have been developed and certified. The studies on the homogeneity of the CRMs material, long-term and short-term stability have been carried out. The applicability of CRMs for monitoring the accuracy of measurement results оf indicators of nutritional value using standardized measurement procedures (GOST 5900-2014, GOST 5901-2014, GOST 31902-2012, GOST 34551-2019) including those used to confirm the compliance of the products with the mandatory requirements of the technical regulations TR CU 021/2011 and TR CU 022/2011 has been demonstrated.
Keywords: chocolate, nutritional value, reference materials, measurement standard, measurement procedure, metrological traceability.
Full texts of articles are available only in Russian in printed issues of the magazine.
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