富硒酵母標(biāo)準(zhǔn)物質(zhì)
名稱：Selenium enriched yeast certified reference material
編號：NRCC-SELM-1
規(guī)格：8g
SELM-個(gè)
Selenium enriched yeast Certified Reference Material
SELM-1 is a selenium enriched yeast Certified Reference Material (CRM) from the NationaResearch Council Canada (NRC) with information on total selenium, selenomethionine andmethionine content. A unit of SELM-1 consists of approximately 8 grams of selenium enrichedyeast in an amber glass vial.
Table 1 shows those analytes for which certified values have been established for SELM-1Certified values are based on unweighted mean results from data generated by threeindependent sets of measurements in the case of selenomethionine (SeMet) and methionine(Met) and two independent measurements for total selenium. The expanded uncertainty (UcRmin the certified value is equal to URm= ku. where uis the combined standard uncertaintycalculated according to the JCGM Guide [1] and k is the coverage factor. The value of uc isdetermined from the combined uncertainties of the various analytical methods (ucha) as well asuncertainties associated with homogeneity (unom) and stability (ustab). lt is intended that UcRwencompasses every aspectthat reasonably contributes to the uncertainty ofthe measurand 2,3A coverage factor of two (k= 2) was applied.
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