1.1 This test method covers the separation and determination of representative aromatics, nonaromatics, and fatty acid methyl ether (FAME) fractions in middle distillates that boil between 170 and 400, including biodiesel blends with up to 20 % by volume of FAME, by solid phase extraction and gas chromatography. 1.2 This test method provides two procedures, A and B. Procedure A is applicable to the petroleum-based middle distillates fuel and Procedure B is applicable to the biodiesel blends with up to 20 % by volume of FAME. 1.3 This test method is applicable to middle distillates samples with aromatics contents ranging from 5 to 50 % by mass and biodiesel blends with FAME content in the range of 0.5 to 20 % by volume. This test method may apply to concentrations outside these ranges, but the precision has not been determined. 1.4 For Procedure B, biodiesels in the form of fatty acid ethyl ether (FAEE) can also fully elute into the FAME fraction, and they have the similar FID relative response factors with that of FAME. So the determined contents of FAME fractions are the sum of concentrations of FAME and FAEE by this method. 1.5 From the investigation results obtained for FAME determination, the low concentrations of monoglycerides (usually less than 0.5 % by mass in biodiesel blends) are not detectable under the gas chromatographic (GC) condition of this test method and will not interfere with the determination of FAME by Procedure B. As a result, biodiesel blends, conforming to the requirements of Specification D6751, containing up to 20 % by volume of biodiesel blend stocks, usually may contain concentrations of monoglycerides of less than 0.1 % by mass. The diglycerides and triglycerides, if present, are not be detected under the GC condition of this test method because of their higher boiling points. 1.6 Units--The values stated in acceptable SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This test method potential is for quality control and to supplement or replace or both current method(s) that are more time consuming.
Keywordsaromatics fraction; nonaromatics fraction; fatty acid methyl ether (FAME) fraction; solid phase extraction; internal standard; middle distillates; FAME biodiesel blends; diesel fuel
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Frank Di Sanzo
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