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ASTM D7504-09

Historical Revision

Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number

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1.1 This test method covers the determination of the total nonaromatic hydrocarbons and trace monocyclic aromatic hydrocarbons in toluene, mixed xylenes, and p-xylene by gas chromatography. The purity of toluene, mixed xylenes, or p-xylene can also be calculated. Similar test methods, using the internal standard calibration technique and the external standard calibration technique, are Test Method D 2360 and D 5917 respectively.

1.2 Total aliphatic hydrocarbons containing 1 through 10 carbon atoms (methane through decanes) can be detected by this test method at concentrations ranging from 0.0001 to 2.5000 weight %. The limit of detection is 0.00003 weight % and the limit of quantitation is 0.0001 weight %.

1.2.1 A small amount of benzene in mixed xylenes or p-xylene may not be distinguished from the non-aromatics and the concentrations are determined as a composite (see 6.1).

1.3 Monocyclic aromatic hydrocarbon impurities containing 6 through 10 carbon atoms (benzene through C10 aromatics) can be detected by this test method at individual concentrations ranging from 0.0001 to 1.0000 weight %.

1.4 The following applies to all specified limits in this test method: for purposes of determining conformance with this test method, an observed value or a calculated value shall be rounded off to the nearest unit in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E 29.

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

1.6 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.


Determining the type and amount of hydrocarbon impurities remaining from the manufacture of toluene, mixed xylenes, and p-xylene used as chemical intermediates and solvents is often required. This test method is suitable for setting specifications and for use as an internal quality control tool where these products are produced or are used. Typical impurities are: alkanes containing 1 to 10 carbons atoms, benzene, toluene, ethylbenzene (EB), xylenes, and aromatic hydrocarbons containing nine carbon atoms.

This method may not detect all components and there may be unknown components that would be assigned inappropriate response factors and thus, the results may not be absolute.

SDO ASTM: ASTM International
Document Number D7504
Publication Date Jan. 15, 2009
Language en - English
Page Count 8
Revision Level 09
Supercedes
Committee D16.01
Publish Date Document Id Type View
May 1, 2023 D7504-23 Revision
July 1, 2021 D7504-21 Revision
Jan. 1, 2020 D7504-20 Revision
Feb. 1, 2018 D7504-18 Revision
June 1, 2017 D7504-17A Revision
April 1, 2017 D7504-17 Revision
Aug. 1, 2016 D7504-16 Revision
July 1, 2015 D7504-15E01 Revision
July 1, 2015 D7504-15 Revision
March 15, 2012 D7504-12 Revision
June 1, 2011 D7504-11 Revision
July 15, 2010 D7504-10 Revision
Jan. 15, 2009 D7504-09E01 Revision
Jan. 15, 2009 D7504-09 Revision