CERTIFICATION REPORT: The certification of the cold filter plugging point (CFPP) and cloud point (CP) in automotive diesel fuel containing a volume fraction of 7 % biodiesel: ERM®-EF004

This report describes the production of ERM®-EF004, which is an automotive diesel fuel material containing a volume fraction of 7 % fatty acid methyl ester (biodiesel) certified for the cold filter plugging point and the cloud point. This material was produced following ISO Guide 34:2009 and is certified in accordance with ISO Guide 35:2006. The material is an automotive diesel fuel containing a volume fraction of approximately 7 % biodiesel that is based on rapeseed oil fatty acid methyl ester with the addition of 1 g/kg antioxidant (butylhydroxytoluene). It was provided by a producer in Germany. The material was filled in amber glass ampoules. Between unit-homogeneity was quantified and stability during dispatch and storage were assessed in accordance with ISO Guide 35:2006 [ ]. Within-unit homogeneity was not quantified as the minimum sample intake is defined by the required sample volume stipulated in the respective documentary standard and comprises almost the whole volume of the two ampoules of every unit. The material was characterised by an interlaboratory comparison of laboratories of demonstrated competence and adhering to ISO/IEC 17025:2005). Technically invalid results were removed but no outlier was eliminated on statistical grounds only. Uncertainties of the certified values were calculated in accordance with the Guide to the Expression of Uncertainty in Measurement (GUM) [ ] and include uncertainties related to possible inhomogeneity, instability and characterisation. The material is intended for quality control and assessment of method performance. As with any reference material, it can be used for establishing control charts or validation studies. The certified reference material (CRM) is available in sets of two amber glass ampoules, each containing 27 mL of automotive diesel fuel material with a volume fraction of 7 % biodiesel closed under argon atmosphere.JRC.F.6-Reference Material

CERTIFICATION REPORT: The certification of selected chemical and physical properties in automotive diesel fuel containing a volume fraction of 7 % biodiesel: ERM®-EF003

This report describes the production of ERM®-EF003, which is an automotive diesel fuel material containing a volume fraction of 7 % fatty acid methyl ester (biodiesel) certified for the volume fraction of the fatty acid methyl ester content, the mass fraction of mono-aromatic hydrocarbon, di-aromatic hydrocarbon, polycyclic aromatic hydrocarbon, and total aromatic hydrocarbon content, and density, kinematic viscosity, and lubricity. This material was produced following ISO Guide 34:2009 [ ] and is certified in accordance with ISO Guide 35:2006 [2]. The material is an automotive diesel fuel containing a volume fraction of approximately 7 % biodiesel that is based on rapeseed oil fatty acid methyl ester with the addition of 1 g/kg antioxidant (butylhydroxytoluene). It was provided by a producer in Germany. The material was filled in amber glass ampoules. 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 the required sample volume stipulated in the respective documentary standard. The material was characterised by an interlaboratory comparison of laboratories of demonstrated competence and adhering to ISO/IEC 17025:2005 [ ]. Technically invalid results were removed but no outlier was eliminated on statistical grounds only. Uncertainties of the certified values were calculated in accordance with the Guide to the Expression of Uncertainty in Measurement (GUM) [ ] and include uncertainties related to possible inhomogeneity, instability and characterisation. The material is intended for quality control and assessment of method performance. As with any reference material, it can be used for establishing control charts or validation studies. The certified reference material (CRM) is available in amber glass ampoules containing 27 mL of automotive diesel fuel material with a volume fraction of 7 % biodiesel closed under argon atmosphere.JRC.F.6-Reference Material

Method Validation for Detection and Quantification of Cocoa Butter Equivalents in Cocoal Butter and Plain Chocolate.

Abstract not availableJRC.D-Institute for Reference Materials and Measurements (Geel

Interlaboratory Evaluation of Injection Techniques for Triglyceride Analysis of Cocoa Butter by Capillary Gas Chromatography.

Abstract not availableJRC.D-Institute for Reference Materials and Measurements (Geel

Interlaboratory Evaluation of Injection Techniques for Triglyceride Analysis by Capillary Gas Chromatography. Results of a Collaborative Study.

Abstract not availableJRC.D-Institute for Reference Materials and Measurements (Geel

Determination of Trace Amounts of Fatty Acids in Edible Oils by Capillary Gas-Liquid Chromatography.

Abstract not availableJRC.I-Institute for Health and Consumer Protection (Ispra

Capillary GLC: A Robust method to Characterise the Triglyceride Profile of Cocoa Butter - Results of an Intercomparison Study.

Abstract not availableJRC.D-Institute for Reference Materials and Measurements (Geel

Toward the Development of Certified Reference Materials for Effective Biodiesel Testing - Part 2: Characterization and Value Assignment

A comprehensive feasibility study for the production of a biodiesel reference material for relevant specification parameters as provided in EN 142141 was launched because of insufficient knowledge available for most of the steps needed for the production of new biodiesel certified reference materials (CRMs). This paper summarizes the findings of this study for the characterization and final value assignment of a biodiesel reference material. Assigned values were calculated as the unweighted mean of the laboratory means of the accepted sets of results for each parameter. Uncertainties were estimated in compliance with the “Guide to the Expression of Uncertainty in Measurement” (GUM, ISO/IEC Guide 98-3:2008),2 including contributions from characterization, homogeneity, and stability studies. Of the 22 parameters considered overall, it could be shown that it would be feasible to prepare and certify reference material for 7 of them (ester, linolenic acid methyl ester, triacylglycerol, total glycerol, iodine value, oxidation stability, and acid value) with the approach taken thus far. For the remaining parameters, different problems were encountered. Although raising a considerable number of challenges, the development of a future biodiesel CRM for many parameters seems feasible. The provision of such a material would favor the building of a harmonized measurement system and, consequently, comparable analytical results.JRC.D.2-Reference material