Certification of the alcoholic strength, the deuterium distribution and the δ13C and δ18O values in ethanol from grape sugar fermentation (ca. 11 % vol.): ERM®-AE202

ERM-AE202 is an ethanol based material certified for the deuterium-to-hydrogen (D/H) amount-of-substance ratios ((D/H)I and (D/H)II), the relative deuterium-to-hydrogen ratio (R), the δ13C value, the δ18O value and the alcoholic strength volume fraction. It was produced under the scope of ISO 17034:2016 accreditation. The certified reference material (CRM) is available in glass bottles containing at least 400 mL of an aqueous solution of ca. 11 % vol. neutral ethanol from grape origin. The between-unit homogeneity was quantified, and stability was assessed in accordance with ISO 33405:2024. Within-unit homogeneity was quantified to determine the minimum sample size. The minimum sample size for a measurement of the (D/H) amount-of-substance ratios and the R content is defined by the protocol described in the standard method OIV-MA-AS311-05, while for the δ13C value, the δ18O value and for the alcoholic strength, it is defined by the results derived from the characterisation studies. The material was characterised by an interlaboratory comparison of laboratories of demonstrated competence and adhering to ISO/IEC 17025:2017. Technically invalid results were removed but no outlier was eliminated unless a technical reason was found. Uncertainties of the certified values include uncertainties related to possible inhomogeneity, instability and characterisation. The material is intended for the assessment of method performance. Before release of the CRM, the certification project was subjected to peer-review of internal experts. ; JRC.F.6 - Reference Materials