ASTM D6729 Method for Individual Components in Spark Ignition Engine Fuels
ASTM D6729 Standard Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100 Metre Capillary High Resolution Gas Chromatography
11. Oxygenates
11.1 A cooperative study for linearity was performed for methanol, ethanol, t-butanol, methyl-t-butyl ether (MTBE), ethyl-t-butyl ether (ETBE), and t-amyl methyl ether (TAME) in concentration ranges from 1.0 mass % up to 30 mass % (Annex A2). The average relative response factors for the oxygenates were calculated from the study and are listed in Table A2.1. They have been incorporated into the IHA Method. The percent standard deviation of these relative response values was as high as 7 %. MTBE was the only oxygenate that was present in sufficient number of samples to meet the ASTM requirements for round robin testing in accordance with RR:D02-1007. Therefore the statistical data for MTBE should be taken from Table A1.2.
12. Expression of Results
12.1 Report the concentration of each components as mass % (m/m) to the nearest 0.001 %.
12.2 The data for individual components may by grouped by summing the concentration of compounds in each particular group type such as paraffin, isoparaffin, olefin, aromatic, naphthene, oxygenates, and unknowns. Commercially available software may be used to provide this function, as well as the calculation of other properties of petroleum liquids.
