This report describes the production of ERM®-EF001, a biodiesel material certified for the ester, linolenic acid methyl ester, monoglyceride, diglyceride, triglyceride, total glycerol and water content, density, viscosity, oxidation stability, acid value, iodine value and flash point. The material was produced following ISO Guide 34:2009.
A rapeseed oil fatty acid methyl ester with the addition of an antioxidant (butylhydroxytoluene) was selected as the base material. It was provided by a biodiesel producer located in Germany. The material was filled in amber glass ampoules. To keep the material homogenous throughout the filling it was gently bubbled with argon.
Between unit-homogeneity was quantified and stability during dispatch and storage were assessed in accordance with ISO Guide 35:2006. The minimum sample intake is defined by the required sample volume stipulated in the respective documentary standard.
The material was characterised by an intercomparison among laboratories of demonstrated competence and adhering to ISO/IEC 17025. Technically invalid results were removed but no outlier was eliminated on statistical grounds only.
Uncertainties of the certified values were calculated in compliance with the Guide to the Expression of Uncertainty in Measurement (GUM) and include uncertainties related to possible inhomogeneity, and instability and to characterisation.
The material is intended for the quality control or assessment of method performance. As any reference material, it can also be used for control charts or validation studies. The CRM is available in glass bottles containing 27 mL of biodiesel closed under argon atmosphere.
The CRM was accepted as European Reference Material (ERM®) after peer evaluation by the partners of the European Reference Materials consortium.