ASTM D 5291 : 2026

1.1The four test procedures (A, B, C, and D) addressed in this standard cover the instrumental determination of carbon, hydrogen, and nitrogen in laboratory samples of petroleum products and lubricants. Values obtained represent the total carbon, the total hydrogen, and the total nitrogen.

1.2Test procedures A, B, and C are applicable to samples such as crude oils, fuel oils, additives, lubricants, and residues for carbon and hydrogen and nitrogen analysis. These test procedures were developed and evaluated in the concentration ranges of 75 % to 87 % by mass for carbon, 9 % to 16 % by mass for hydrogen, and <0.1 % to 2 % by mass for nitrogen.

1.3Test procedure D is applicable to samples such as lubricants and additives. The test procedure was developed and evaluated in the concentration ranges of 77 % to 85 % by mass for carbon, 12 % to 14 % by mass for hydrogen, and 0.10 % to 1.59 % by mass for nitrogen.

1.4These four test procedures (A, B, C, and D) are not recommended for the analysis of volatile materials such as gasoline, gasoline-oxygenate blends, or gasoline type aviation turbine fuels.

1.5The results of these tests can be expressed as mass % carbon, hydrogen, or nitrogen.

1.6The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.7This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.