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    ASTM D8368 - 21

    Standard Test Method for Determination of Totals of Saturate, Aromatic, Polyaromatic and Fatty Acid Methyl Esters (FAME) Content of Diesel Fuel Using Gas Chromatography with Vacuum Ultraviolet Absorption Spectroscopy Detection (GC-VUV)

    Active Standard ASTM D8368 | Developed by Subcommittee: D02.04.0L

    Book of Standards Volume: 05.05


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    Significance and Use

    5.1 The determination of group type composition of diesel fuel is useful for evaluating quality and expected performance. Aromatics and polyaromatics, in particular, are related to combustion characteristics, cetane number, energy content, lubricity, water solubility and exhaust emissions.

    5.1.1 Aromatic hydrocarbon type analysis may be useful for evaluating refinery processes.

    5.1.2 The ability to determine aromatics content in the presence of FAME may be useful to users of diesel fuel.

    1. Scope

    1.1 This test method covers a standard procedure for the determination of group type totals of saturate, aromatic, polyaromatic, and FAME content in diesel fuel using gas chromatography and vacuum ultraviolet absorption spectroscopy detection (GC-VUV).

    1.1.1 Polyaromatic totals are the result of the summation of diaromatic and tri-plus aromatic group types. Aromatics are the summation of monoaromatic and polyaromatic group types. FAME content is the result of summation of individual fatty acid methyl esters.

    1.2 Concentrations of group type totals are determined by percent mass or percent volume. The applicable ranges are as follows:

    Group Type

    Applicable % Volume Range

    Applicable % Mass Range

    Saturate

    64 to 99.5

    60 to 99.3

    Aromatic

    0.5 to 36

    0.7 to 40

    Monoaromatic

    0.5 to 36

    0.7 to 40

    Diaromatic

    0.03 to 9

    0.05 to 11

    Tri+ aromatic

    0.03 to 1

    0.03 to 1.5

    Polyaromatic

    0.03 to 10

    0.05 to 12.5

    FAME

    2 to 20

    2 to 23

    Note 1: Applicable ranges of components and precision will ultimately be defined by an interlaboratory study.

    1.3 Diesel fuel containing biodiesel, (FAME, that is, fatty acid methyl esters) can be analyzed by this test method. The FAME component completely elutes from the analytical column independent of feedstock; however, interim precision is determined only with soy methyl esters. FAME content in diesel fuel can be determined by Test Methods D7371 or D7861.

    1.4 Individual hydrocarbon components are not reported by this test method; however, any individual component determinations are included in the appropriate summation of the totals of saturate, aromatic, polyaromatic, monoaromatic, diaromatic, tri-plus aromatic, or FAME groups.

    1.4.1 Individual components are typically not baseline-separated by the procedure described in this test method, that is, some components will coelute. The coelutions are resolved at the detector using VUV absorbance spectra and deconvolution algorithms.

    1.5 This test method has been tested for diesel fuel, including renewable diesel fuels from hydrotreated vegetable oil (HVO) and gas to liquid (GTL) processes, and biodiesel blends; this test method may apply to other hydrocarbon streams boiling between heptane (98 °C) and triacontane (450 °C), but has not been extensively tested for such applications.

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

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

    1.8 This 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

    D4307 Practice for Preparation of Liquid Blends for Use as Analytical Standards

    D6299 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance

    D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products, Liquid Fuels, and Lubricants

    D6730 Test Method for Determination of Individual Components in Spark Ignition Engine Fuels by 100-Metre Capillary (with Precolumn) High-Resolution Gas Chromatography

    D6792 Practice for Quality Management Systems in Petroleum Products, Liquid Fuels, and Lubricants Testing Laboratories

    D7371 Test Method for Determination of Biodiesel (Fatty Acid Methyl Esters) Content in Diesel Fuel Oil Using Mid Infrared Spectroscopy (FTIR-ATR-PLS Method)

    D7372 Guide for Analysis and Interpretation of Proficiency Test Program Results

    D7861 Test Method for Determination of Fatty Acid Methyl Esters (FAME) in Diesel Fuel by Linear Variable Filter (LVF) Array Based Mid-Infrared Spectroscopy


    Referencing This Standard
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    DOI: 10.1520/D8368-21

    Citation Format

    ASTM D8368-21, Standard Test Method for Determination of Totals of Saturate, Aromatic, Polyaromatic and Fatty Acid Methyl Esters (FAME) Content of Diesel Fuel Using Gas Chromatography with Vacuum Ultraviolet Absorption Spectroscopy Detection (GC-VUV), ASTM International, West Conshohocken, PA, 2021, www.astm.org

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