1.1 This test method covers the determination of hydrocarbon types over the concentration ranges from 5 to 99 volume % aromatics, 0.3 to 55 volume % olefins, and 1 to 95 volume % saturates in petroleum fractions that distill below 315176;C. This test method may apply to concentrations outside these ranges, but the precision has not been determined. Samples containing dark-colored components that interfere in reading the chromatographic bands cannot be analyzed.
Note 18212;The scope of this test method today is NOT to depentanize to reflect current practice. Results obtained from the analysis of samples containing significant levels of C5 and lighter hydrocarbons might be less accurate. The potential bias is not certain and may not be consistent. Prior versions of Test Method D 1319 have specified depentanization when samples contain any of the following: C3 or lighter hydrocarbons, more than 5 % C4 hydrocarbons, or more than 10 % C4 and C5 hydrocarbons. The results of this are still unclear and certainly controversial. In such a case, depentanization was done according to Test Method D 2001 followed by subsequent analysis of the depentanized sample by Test Method D 1319. A correction to the depentanized sample results was then required to place them on an as-received basis by using such method as Test Method D 2427 which determined the amounts of C5 minus hydrocarbons in the undepentanized sample.
1.2 This test method is intended for use with full boiling range products. Cooperative data have established that the precision statement does not apply to narrow boiling petroleum fractions near the 315176;C limit. Such samples are not eluted properly, and results are erratic.
1.3 The applicability of this test method to products derived from fossil fuels other than petroleum, such as coal, shale, or tar sands, has not been determined, and the precision statement may or may not apply to such products.
1.4 The precision statement for this test method has been determined with unleaded fuels that do not contain oxygenated blending components. It may or may not apply to automotive gasoline's containing lead antiknock mixtures or oxygenated gasoline blending components, or both.
1.5 The oxygenated blending components, methanol, ethanol, methyl-tert-butylether (MTBE), methyl- tert-amylmethyl (TAME), and ethyl-tert-butylether (ETBE), do not interfere with the determination of hydrocarbon types at concentrations normally found in commercial blends. These oxygenated components are not detected since they elute with the alcohol desorbent. Other oxygenated compounds shall be individually verified. When samples containing oxygenated blending components are analyzed, correct the results to a total-sample basis.
1.6 The values stated in SI units are to be regarded as standard.
Note 28212;For the determination of olefins below 0.3 volume %, other test methods are available, such as Test Method D 2710.
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. For specific hazard statements, see Section 7, 8.1, and 10.5.
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