Formerly under the jurisdiction of Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants, this test method was withdrawn without replacement in March 2023. This test method was created in 1969 and had a precision statement but no referenced research report. ASTM archives do not have a research report on file; Form and Style Guide requires a research report. The test method was originally developed for specific types of magnetic sector mass spectrometers and published calculations were based on such instrumentation. As a result, there was no easy mechanism to update the test method without method development. In addition, the committee understands that this method may not be performed by many, if any, laboratories. There are several test methods (e.g. D5443), although not fully equivalent to D2789, that provide compositional data for such low olefinic streams. ASTM will continue to provide copies of the test method for those that may need it. Committee D02.04M encourages members to submit potential replacement test method(s), based on newer technologies that can be developed into ASTM approved test method(s).
Значение и использование5.1 A knowledge of the hydrocarbon composition of gasoline process streams, blending stocks and finished motor fuels is useful in following the effect of changes in plant operating conditions, diagnosing process upsets, blending finished products and in evaluating the relationship between composition and performance properties.
1.1 This test method covers the determination by mass spectrometry of the total paraffins, monocycloparaffins, dicycloparaffins, alkylbenzenes, indans or tetralins or both, and naphthalenes in gasoline having an olefin content of less than 3 % by volume and a 95 % distillation point of less than 210 °C (411 °F) as determined in accordance with Test Method D86. Olefins are determined by Test Method D1319, or by Test Method D875.
1.2 It has not been determined whether this test method is applicable to gasoline containing oxygenated compounds (for example, alcohols and ethers).
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.