ASTM D5186 Determination of Aromatic Content and Polynuclear Aromatic Content
ASTM D5186 Standard Test Method for Determination of the Aromatic Content and Polynuclear Aromatic Content of Diesel Fuels and Aviation Turbine Fuels By Supercritical Fluid Chromatography
1. Scope
1.1 This test method covers the determination of the total amounts of monoaromatic and polynuclear aromatic hydrocarbon compounds in motor diesel fuels, aviation turbine fuels, and blend stocks by supercritical fluid chromatography (SFC). The range of aromatics concentration to which this test method is applicable is from 1 to 75 mass %. The range of polynuclear aromatic hydrocarbon concentrations to which this test method is applicable is from 0.5 to 50 mass %.
1.2 The values stated in SI units are to be regarded as standard. The values stated in inch-pound units are for information only.
1.3 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.
2. Referenced Documents
2.1 ASTM Standards:
D1319 Test Method for Hydrocarbon Types in Liquid Petroleum Products by Fluorescent Indicator Adsorption
D1655 Specification for Aviation Turbine Fuels
D2425 Test Method for Hydrocarbon Types in Middle Distillates by Mass Spectrometry
D6299 Practice for Applying Statistical Quality Assurance Techniques to Evaluate Analytical Measurement System Performance
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 critical pressure, n - that pressure needed to condense a gas at the critical temperature.
3.1.2 critical temperature, n - the highest temperature at which a gaseous fluid may be converted to a liquid by means of compression.
3.1.3 mononuclear aromatic hydrocarbons, n - hydrocarbon compounds containing exactly one aromatic ring. This group includes benzene, alkyl-substituted benzenes, indans, tetralins, alkyl-substituted indans, and alkyl-substituted tetralins.
3.1.4 polynuclear aromatic hydrocarbons, n - all hydrocarbon compounds containing two or more aromatic rings. These rings may be fused as in naphthalene and phenanthrene, or separate as in biphenyl.
3.1.5 restrictor, n - a device, attached to the outlet of a chromatographic column, to restrict the mobile phase flow such that the mobile phase is maintained in the supercritical state throughout the chromatographic column.
3.1.6 supercritical fluid, n - a fluid maintained in a thermodynamic state above its critical temperature and critical pressure.
3.1.7 supercritical fluid chromatography, n - a class of chromatography that employs supercritical fluids as mobile phases.
